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Mollusca

(Phylum)

Overview

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A large and diverse phylum of soft-bodied, usually unsegmented, coelomate animals , many of which live enclosed in a hard shell. They include the classes Gastropoda (winkles, whelks, slugs, snails, sea slugs etc.), Bivalvia (clams, cockles etc.), and other small classes of shells and the Cephalopoda (nautilus, squids and octopuses). The coelom* is small and the main body cavity is a blood-filled haemocoel. Molluscs have well-developed sense organs and nervous system, a heart and blood system.

Soft-bodied animals that usually produce an exoskeleton composed of calcium carbonate. This shell serves both protective and supportive purposes. All molluscs have a fleshy mantle -- a fold or lobe (or a pair of them) of fleshy material, which secretes, modifies and lines the shell.

Members of all classes except the bivalves possess a ribbon-like set of hooked teeth called radula. These they rasp (think of a fingernail file) back and forth over their food; vegetarian species use them to scrape algae off rocks and other substrates, while most molluscan carnivores use them to penetrate the surface of their prey.

Photos

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Taxonomy

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The Phylum Mollusca is a member of the Kingdom Animalia. Here is the complete "parentage" of Mollusca:

The Phylum Mollusca is further organized into finer groupings including:

Families

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Abyssochrysidae

Abyssochrysidae is a family of sea snails, marine gastropod mollusks in the clade Caenogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Acanthoceratidae

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Acanthochitonidae

Acanthochitonidae is a family of chitons. [more]

Acanthomeniidae

[more]

Acanthonematidae

[more]

Acavidae

Acavidae is a taxonomic family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Acavoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Achatinellidae

Achatinellidae is a family of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Achatinelloidea. [more]

Achatinidae

Achatinidae (New Latin, from Greek "agate") is a family of medium to large sized tropical land snails, terrestrial pulmonate gastropod mollusks from Africa. The family includes some 13 genera. [more]

Aciculidae

The Aciculidae are a family of minute land snails which have opercula. (An operculum is a little door that closes the shell when the animal retracts into it.) In other words, Aciculidae are terrestrial operculate gastropods. Even though Aciculidae are land snails, they live in rather wet conditions, among mosses and dead leaves and they have sometimes been described as "winkles come ashore". [more]

Acleistoceratidae

[more]

Aclididae

Aclididae is a family of sea snails, marine gastropod mollusks, in the superfamily Eulimoidea. [more]

Acmaeidae

Lottiidae is a family of sea snails, specifically true limpets, marine gastropod mollusks in the superfamily Lottioidea and the clade Patellogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Acochlidiidae

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Acrochordiceratidae

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Acroloxidae

Acroloxidae, commonly known as river limpets, are a taxonomic family of very small, freshwater snails, aquatic pulmonate gastropod limpet-like mollusks with a simple flattened conical shell in the clade Hygrophila. [more]

Acroreiidae

? Acroreiidae is an extinct family of air-breathing snails, pulmonate gastropod mollusks in the superfamily Siphonariidae. The living siphonariids are all marine pulmonates, false sea limpets that breathe air. [more]

Actaeonellidae

[more]

Acteonellidae

Acteonellidae is an extinct family of gastropods in the informal group Lower Heterobranchia (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Acteonidae

[more]

Acteoninidae

Acteoninidae is an extinct family of fossil sea snails, marine gastropod mollusks in the clade Caenogastropoda. [more]

Actinoceratidae

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Actinocyclidae

Actinocyclidae is a family of sea slugs, dorid nudibranchs, marine gastropod mollusks in the superfamily Doridoidea. This family is within the clade Euctenidiacea. [more]

Acutichitonidae

[more]

Addisoniidae

Addisoniidae is a family of sea snails, deepwater true limpets, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Adeorbidae

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Adrianitidae

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Adygeyidae

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Aegiretidae

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Aegiridae

Aegires is a genus of dorid nudibranch that feeds exclusively on calcareous sponges. Images of its radula can be seen at Biologie 66: 29?40. 1996. http://www.bentart.es/articulos/Troncoso_et_al__Opistobranchia_Bull_Belg.pdf.  and W?Gele, H. (1987). "Redescription and anatomy of Aegires (Anaegires) albus Thiele, 1912 (Opisthobranchia, Doridacea) and synonymy with A. Protectus Odhner, 1934". Polar Biology 7 (5): 267?272. doi:10.1007/BF00443944edit [more]

Aeolidiidae

Aeolidiidae, the aeolid nudibranchs, are a family of Nudibranchs. Many feed on hydroids(anemones) and thus have highly serrated radular teeth. [more]

Agathiceratidae

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Aglajidae

Aglajidae is a family of often colorful, medium-sized, sea slugs, marine opisthobranch gastropod mollusks. These are not nudibranchs; instead they are headshield slugs, in the clade Cephalaspidea. [more]

Agoniatitidae

[more]

Agriolimacidae

Agriolimacidae is a family of small and medium sized land slugs, or shell-less snails, terrestrial pulmonate gastropod mollusks. [more]

Aillyidae

[more]

Akeridae

Akeridae is a small taxonomic family of sea snails, marine gastropod molluscs belonging to the superfamily Akeroidea, the sea hares. The family, in its original spelling "Aceridae", has previously been attributed in error to Pilsbry, 1893. [more]

Aldanellidae

Aldanellidae is an extinct family of paleozoic molluscs that have been assigned to the Gastropod stem group but may also belong to a paraphyletic "Monoplacophora". [more]

Aldisidae

Aldisa is a genus of small sea slugs, dorid nudibranchs in the family Dorididae within the clade Euthyneura. [more]

Allodesmatidae

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Alloposidae

The Seven-arm Octopus (Haliphron atlanticus) is the largest known species of octopus based on scientific records, with a total estimated length of 4 m and mass of 75 kg. However, there have been claims of even larger octopuses of the species Enteroctopus dofleini. [more]

Alycaeidae

Cyclophoridae is a taxonomic family of small to large tropical land snails with an operculum, terrestrial gastropod mollusks in the informal group Architaenioglossa belonging to the clade Caenogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Amaltheidae

Amaltheidae is a family of eoderoceratacean ammonitids from the Lower Jurassic consisting of genera characterised by stigated discoidal oxycones?narrow involute shells with narrowly rounded to angular venters that bear a series of grooves, or ridges, along broad flanks, which according to the Treatise L, 1957, evolved into strongly ribbed planulates (discoidal evolute shells) with quadrate whorls, typically with crenulated keels; involving all together four genera. [more]

Amastridae

Amastridae is a taxonomic family of small, air-breathing, land snails, terrestrial pulmonate gastropod mollusks in the superfamily Cochlicopoidea. [more]

Amathinidae

Amathinidae, is a taxonomic family mostly consisting of small and minute sea snails, marine heterobranch gastropod molluscs or micromolluscs in the superfamily Pyramidelloidea. [more]

Amberleyidae

Amberleyidae is an extinct family of sea snails, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Ambonychiidae

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Ammonitellidae

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Amnicolidae

Amnicolidae is a family of small freshwater snails with a gill and an operculum, aquatic gastropod mollusks. [more]

Ampezzanildidae

The Ampezzanildidae is an extinct taxonomic family of sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia. [more]

Amphibolidae

Amphibolidae is a family of air-breathing snails with opercula, terrestrial pulmonate gastropod molluscs. [more]

Amphibulimidae

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Amphimeniidae

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Amphitomariidae

The Amphitomariidae is an extinct taxonomic family of sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia. [more]

Amphitretidae

Amphitretus is a genus of pelagic gelatinous octopuses. It is the sole genus of family Amphitretidae and consists of 2 species. Some authorities consider as a subspecies of Amphitretus pelagicus, making this family monotypic. [more]

Ampullaridae

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Ampullariidae

Ampullariidae, common name the apple snails, is a family of large freshwater snails, aquatic gastropod mollusks with a gill and an operculum. This family is in the superfamily Ampullarioidea and is the type family of that superfamily. [more]

Ampullinidae

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Anabathridae

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Anabathronidae

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Anadenidae

Anadenidae is a taxonomic family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the superfamily Arionidae (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Anadromidae

Anadromidae is an extinct family of gastropods in the clade Eupulmonata (according to taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Anarcestidae

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Anastomopsidae

?Anastomopsidae is an extinct family of fossil gastropods in the superfamily Punctoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Anatinellidae

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Anatomidae

Anatomidae is a family of minute sea snails, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Ancistrocheiridae

The Sharpear Enope Squid (Ancistrocheirus lesueurii) is the only species in the genus Ancistrocheirus and family Ancistrocheiridae. With a mantle length of 25 cm, this moderately sized squid may be found throughout the tropical and subtropical oceans. They tend to be found at mesopelagic depths (200-1000 metres down). [more]

Ancylcoceratidae

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Ancylidae

Ancylini is a tribe of small, freshwater, air-breathing limpets, aquatic pulmonate gastropod mollusks in the family Planorbidae the ram's horn snails and their allies. This tribe was previously considered to be a family; this current taxonomic placement within Planorbidae is according to the taxonomy of the Gastropoda (Bouchet & Rocroi, 2005). [more]

Ancyloceratidae

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Anisoceratidae

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Anisocyclidae

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Annulariidae

The family Pomatiidae is a taxonomic family of small operculate land snails, terrestrial gastropod mollusks that can be found over the warmer parts of the Old World. In the older literature, this family is designated as Pomatiasidae. [more]

Anomiidae

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Anomphalidae

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Anoptychiidae

?Anoptychiidae is an extinct taxonomic family of sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia. [more]

Anozygidae

?Anozygidae is an extinct family of fossil sea snails, marine gastropod mollusks in the clade Caenogastropoda. [more]

Anthracoceratidae

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Anthracopupidae

?Anthracopupidae is an extinct family of fossil sea snails, marine gastropod mollusks in the clade Caenogastropoda. [more]

Antipleuridae

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Aplacophora

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Aplustridae

The Aplustridae is a taxonomic family of sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia. [more]

Aplysiidae

The superfamily Aplysioidea is a superfamily of mostly rather large sea slugs, marine gastropod mollusks in the clade Aplysiomorpha within the informal group Opisthobranchia. [more]

Aporrhaidae

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Aporrhaididae

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Aporrhaiidae

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Apsidoceratidae

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Aranucidae

Aranucidae is a family of sea slugs, nudibranchs, marine gastropod mollusks in the superfamily Tritonioidea. [more]

Araxoceratidae

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Arcestidae

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Archaeopragidae

?Archaeopragidae is an extinct family of paleozoic molluscs of uncertain position (Gastropoda or Monoplacophora). [more]

Archidorididae

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Archinacellidae

?Archinacellidae is an extinct family of paleozoic molluscs of uncertain position (Gastropoda or Monoplacophora). [more]

Architectonicidae

Architectonicidae, common name the staircase shells or sundials, are a family of sea snails, marine gastropod mollusks in the informal group "Lower Heterobranchia" (= Allogastropoda) of the clade Heterobranchia. [more]

Architeuthidae

The giant squid (genus: Architeuthis) is a deep-ocean dwelling squid in the family Architeuthidae, represented by as many as eight species. Giant squid can grow to a tremendous size (see Deep-sea gigantism): recent estimates put the maximum size at 13 metres (43 ft) for females and 10 metres (33 ft) for males from caudal fin to the tip of the two long tentacles (second only to the colossal squid at an estimated 14 metres (46 ft), one of the largest living organisms). The mantle is about 2 metres (6.6 ft) long (more for females, less for males), and the length of the squid excluding its tentacles is about 5 metres (16 ft). There have been claims of specimens measuring 20 metres (66 ft) or more, but no giant squid of such size has been scientifically documented. [more]

Arcidae

Ark clam is the common name for a family of small to large-sized saltwater clams or marine bivalve molluscs in the family Arcidae. Ark clams vary both in shape and size. They number about 200 species worldwide. [more]

Arcticidae

Arcticidae is a family of bivalve molluscs in the order Veneroida. [more]

Argnidae

Argnidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks. [more]

Argonautidae

Argonautidae is a family of cephalopods encompassing the modern paper nautiluses of the genus Argonauta along with several extinct genera of shelled octopods. [more]

Arietitidae

Arietitidae is a family of true ammonites that make up part of the superfamily Psilocerataceae. They comprise medium-size to large or gigantic genera which in general are strongly ribbed, tuberculate in some, with keeled or grooved and keeled venters, and well differentiated ammonitic sutures. The aptycus is single valved with a shiny, concentrically striated surface. [more]

Ariolimacidae

Arionidae

[more]

Ariophantidae

Ariophantidae is a taxonomic family of air-breathing land snails and semi-slugs, terrestrial pulmonate gastropod mollusks in the superfamily Helicarionoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Armenoceratidae

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Arminidae

Arminidae is a family of sea slugs, marine gastropod mollusks in the superfamily Arminoidea. [more]

Arpaditidae

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Ascoceratidae

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Aspidoceratidae

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Assimineidae

Assimineidae is a family of minute snails with an operculum that live in saltwater, freshwater or on the land; they are mostly aquatic gastropod mollusks or micromollusks, in the clade Littorinimorpha. [more]

Astartidae

Astartidae is a family of bivalves related to the family or venus clams. [more]

Asteronotidae

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Ataphridae

Ataphridae, common name the false top snails, is a family of sea snails, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Ataxioceratidae

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Athoracophoridae

Athoracophoridae, common name the leaf-veined slugs, are a family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the infraorder Stylommatophora, the stalk-eyed snails and slugs. Many of the species have an attractive pattern on their dorsal surface which resembles the veins in a leaf, hence the common name. [more]

Atlantidae

Atlantidae is a family of sea snails, holoplanktonic gastropod molluscs in the clade Littorinimorpha. [more]

Atsabitidae

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Auguritidae

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Aulacoceratidae

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Aulacostephanidae

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Aviculopectinidae

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Axinolobidae

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Azecidae

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Babakinidae

Babakina is a genus of sea slug[ ]s, aeolid nudibranchs, marine gastropod mollusks in the superfamily Aeolidioidea. [more]

Babinkidae

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Babyloniidae

Babyloniidae is a taxonomic family of predatory sea snails, marine gastropod mollusks within the superfamily Muricoidea. [more]

Bactritidae

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Baculitidae

Baculitidae is a family of extinct ammonoid cephalopods that lived mostly during the Late Cretaceous, and often included in the suborder Ancyloceratina. [more]

Badiotitidae

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Bakevelliidae

Bakevelliidae is an extinct family of prehistoric bivalves that lived from the Late Mississippian until the Middle Eocene. Bakevelliidae species are found worldwide, excluding Antarctica. Living a stationary life attached to substrate in marine and brackish environments, they formed shells of an aragonite composition with a low amount of magnesium calcite. The family was named by King in 1850. At least one genus in the family, , has a notably twisted commissure join. [more]

Barleeidae

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Barleeiidae

Barleeiidae (often also spelled as Barleeidae) is a family of minute sea snails, micromollusks in the clade Littorinimorpha. These snails are very abundant and live in sublittoral and intertidal waters on rocky substrates. [more]

Barrandeoceratidae

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Bathydorididae

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Bathyphytophilidae

Bathyphytophilidae is a family of very small deepwater sea snails or false limpets, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Bathysciadiidae

Bathysciadiidae is a family of sea snails, deep-sea limpets, marine gastropod mollusks in the clade Cocculiniformia (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Bathyteuthidae

Bathyteuthis is the singular genus of squid in the family Bathyteuthidae, encompassing three species. None obtain a mantle length greater than 80 mm. [more]

Batillaridae

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Batillariidae

Batillariidae, common name batillariids or mudcreepers, are a family of marine, cerithioidean gastropod molluscs in the clade Sorbeoconcha. They consist of 14 living species, classified in six to eight genera. [more]

Batoteuthidae

Bush-club Squid (Batoteuthis skolops) is the single rare species in genus Batoteuthis, which is the only genus in family Batoteuthidae. The squid is found in Antarctic waters, and reaches a mantle length of at least 350 mm. Some features of this creature are a small head, a long tail and a very peculiar tentacle with six series of suckers on the club. [more]

Belemnitellidae

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Belemnitidae

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Belemnopseidae

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Belemnoseidae

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Belemnotheutididae

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Bellerophinidae

Bellerophinidae is an extinct family of sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Bellerophontidae

The Bellerophontidae is an extinct family of specialized globose bellerophontids; Paleozoic and Early Triassic mollusks of uncertain position (Gastropoda or Monoplacophora). [more]

Belopteridae

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Belosaepiidae

Belosaepiidae is a family of cephalopods known from the Eocene, and bearing close similarity to the sepiid cuttlefish, whilst retaining the remnants of a belemnite-like guard. [more]

Belosepiellidae

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Berkhoceratidae

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Beyrichitidae

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Binneyidae

Binneyidae is a family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the superfamily Arionoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Binneytidae

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Bisatoceratidae

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Bithyniidae

Bithyniidae is a family of small freshwater snails with an operculum, aquatic gastropod molluscs in the clade Littorinimorpha. [more]

Boettgerillidae

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Bohaispiridae

Bohaispiridae is an extinct family of sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Bolitaenidae

Bolitaenidae is a family of small, common pelagic octopuses found in all tropical and temperate oceans of the world. The family's taxonomy is not entirely certain; recent research suggests there should be just two genera, and Japetella, both of which are thought to be monotypic. Under this view, the family would represent two very similar species: Bolitaena pygmaea and Japetella diaphana. [more]

Bornellidae

Bornellidae is a family of sea snails or sea slugs, marine gastropod mollusks in the superfamily Tritonioidea. [more]

Boselliidae

Bosellia is a genus of sea slugs, marine gastropod mollusks within the superfamily Placobranchoidea. [more]

Brachioteuthidae

Brachioteuthidae is a family of squid. It contains two genera and around six species. [more]

Brachycycloceratidae

[more]

Brachytrematidae

Brachytrematidae is an extinct family of sea snails, marine gastropod molluscs in the clade Sorbeoconcha. [more]

Bradybaenidae

Bradybaenidae is a taxonomic family of medium-sized to small land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea. [more]

Brancoceratidae

[more]

Bransoniidae

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Bucanellidae

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Bucaniidae

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Buccinidae

Buccinidae is a very large and diverse taxonomic family of large sea snails, often known as whelks or true whelks. [more]

Buccinulidae

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Buchiidae

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Buchiolidae

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Buliminidae

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Bulimulidae

Bulimulinae is a taxonomic subfamily of medium-sized to large, air-breathing, tropical and sub-tropical land snails, terrestrial pulmonate gastropod molluscs in the family Orthalicidae, according to the taxonomy of the Gastropoda (Bouchet & Rocroi, 2005). [more]

Bulinidae

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Bullactidae

Haminoeidae, commonly known as the haminoeid bubble snail family, is a taxonomic family of sea snails, marine opisthobranch gastropod mollusks in the superfamily Haminoeoidea. [more]

Bullidae

Bulla is a genus of medium to large hermaphrodite sea snails, shelled marine opisthobranch gastropod molluscs. These herbivorous snails are in the suborder Cephalaspidea, headshield slugs, and the order Opisthobranchia. [more]

Bullinidae

Bullinidae is a taxonomic family of small sea snails or bubble snails, marine gastropod mollusks in the superfamily Acteonoidea. [more]

Bursidae

Bursidae, common name "frog snails" or "frog shells" is a rather small taxonomic family of large sea snails, marine gastropod predatory snails in the clade Littorinimorpha. [more]

Butovicellidae

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Caecidae

Caecidae is a taxonomic family of very small and minute sea snails or micromolluscs, marine gastropod molluscs in the order Littorinimorpha. [more]

Caliphyllidae

Caliphyllidae is a taxonomic family of sacoglossan sea slugs. These are marine opisthobranch gastropod mollusks in the clade Sacoglossa. [more]

Calliodentaliidae

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Calliostomatidae

Calliostomatidae is a family of sea snails within the superfamily Trochoidea and the clade Vetigastropoda. [more]

Callistoplacidae

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Callochitonidae

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Calmidae

Calmidae is a taxonomic family of sea slugs. These are specifically aeolid nudibranchs. They are marine gastropod molluscs in the superfamily Fionoidea. [more]

Calopiidae

Calopiidae is a family of sea snails, marine gastropod molluscs in the superfamily Rissooidea. [more]

Calyptraeidae

Calyptraeidae, common name the slipper snails or slipper limpets, cup-and-saucer snails, and Chinese hat snails are a family of small to medium-sized marine prosobranch gastropods. This family includes the slipper snails (Crepidula species), the Chinese hat snails, (Calyptraea species), and the cup-and-saucer snails (Crucibulum species) among others. [more]

Camaenidae

Camaenidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea. [more]

Cambridiidae

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Campanilidae

Campanilidae are a taxonomic family of sea snails, marine gastropod molluscs in the clade Sorbeoconcha. [more]

Cancellariidae

Cancellariidae, common name the nutmeg snails or nutmeg shells, are a family of small to medium-large sea snails, marine gastropod mollusks in the clade Neogastropoda. Their shells resemble a nutmeg seed. [more]

Canterburyellidae

? Canterburyellidae is an extinct family of sea snails, marine gastropod mollusks in the clade Sorbeoconcha. [more]

Caprinidae

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Caprotinidae

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Capulidae

Capulidae, common name the cap snails or cap shells, are a taxonomic family of limpet-like sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Carbactinoceratidae

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Carcassonnellidae

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Cardiidae

Cockle is the common name for a group of (mostly) small, edible, saltwater clams, marine bivalve molluscs in the family Cardiidae. [more]

Cardiliidae

[more]

Cardiniidae

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Cardioceratidae

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Carditidae

Carditidae is a family of marine bivalve clams of the order . [more]

Carinariidae

Carinariidae, known by the common name "heteropods" like their relatives in the Pterotracheoidea, is a taxonomic family of swimming or floating sea snails, pelagic marine gastropod molluscs in the clade Littorinimorpha. [more]

Carinaropsidae

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Carychiidae

Carychiinae is a taxonomic subfamily of minute air-breathing land snails, terrestrial pulmonate gastropod mollusks. [more]

Carydiidae

[more]

Caryodidae

Caryodidae is a taxonomic family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Acavoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Cassianaxidae

The Cassianaxidae is an extinct taxonomic family of sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia. [more]

Cassianebalidae

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Cassianellidae

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Cassidae

Cassidae is a taxonomic family of medium-sized, large and sometimes very large sea snails commonly called helmet snails or bonnet snails. These are marine gastropod mollusks in the superfamily Tonnoidea and the clade Littorinimorpha. [more]

Cassiopidae

?Cassiopidae is an extinct family of sea snails, marine gastropod molluscs in the clade Sorbeoconcha. [more]

Catantostomatidae

Catantostomatidae is an extinct family of marine gastropods included in the Vetigastropoda and placed in the superfamily Pleurotomarioidea [more]

Cavolinidae

[more]

Cavoliniidae

The family Cavoliniidae is a taxonomic group of small floating sea snails, pelagic marine opisthobranch gastropod mollusks. [more]

Caymanabyssiidae

Caymanabyssiidae is a family of sea snails, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Celtitidae

[more]

Centroceratidae

[more]

Cerastidae

Cerastidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks. [more]

Cerastuidae

Cerastidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks. [more]

Ceratitidae

[more]

Ceratomyidae

[more]

Ceratomyopsidae

[more]

Ceriidae

[more]

Cerionidae

Cerionidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Urocoptoidea. [more]

Ceritellidae

The ?Ceritellidae is an extinct taxonomic family of sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia. [more]

Cerithiidae

Cerithiidae, common name the cerithiids or ceriths, is a large family of medium-sized marine gastropods in the clade Sorbeoconcha. [more]

Cerithiopsidae

Cerithiopsidae are a family of very small and minute sea snails, marine gastropod molluscs or micromollusks in the informal group Ptenoglossa. Gastropods in this family are known as cerithiopsids. [more]

Chaetodermatidae

[more]

Chamidae

Chamidae (or jewel boxes) is a family of marine bivalve clams of the order Veneroida. [more]

Charcotiidae

Charcotiidae is a family of sea slugs, nudibranchs, shell-less marine gastropod molluscs, in the clade Euthyneura. There are no subfamilies in Charcotiidae. [more]

Charopidae

Charopidae is a taxonomic family of small air-breathing land snails (and semi-slugs such as Otoconcha dimidiata), terrestrial pulmonate gastropod mollusks in the superfamily Punctoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Cheeneetnukiidae

[more]

Cheiloceratidae

[more]

Chilinidae

[more]

Chiroteuthidae

Chiroteuthids are deep-sea squid of the family Chiroteuthidae. They are generally small to medium in size, rather soft and gelatinous, and slow moving. They are found in most temperate and tropical oceans, but are known primarily from the North Atlantic, North Pacific, and Indo-Pacific. The family is represented by approximately twelve species and four subspecies in four genera, two of which are monotypic. They are sometimes known collectively as whip-lash squid: However, this common name is also applied to the Mastigoteuthidae, which is itself sometimes treated as a subfamily (Mastigoteuthinae) of Chiroteuthidae. [more]

Chitinobelidae

[more]

Chitonidae

Chitonidae is a family of chitons or polyplacophorans, marine mollusks whose shell is composed of eight articulating plates or valves. There are fifteen extant genera in three subfamilies. [more]

Chlamydephoridae

Chlamydephoridae is a family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the clade Eupulmonata (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Chlamydoconchidae

[more]

Chondrinidae

Chondrinidae is a family of mostly minute air-breathing land snails, terrestrial pulmonate gastropod mollusks in the order Pulmonata. [more]

Chondroteuthididae

[more]

Choriplacidae

[more]

Choristoceratidae

[more]

Chromodorididae

Chromodorididae are a taxonomic family of medium-sized to large, colorful, sea slugs; dorid nudibranchs in the superfamily Doridoidea. These are marine gastropod mollusks. [more]

Chronidae

Chronidae is a family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the superfamily Gastrodontoidea within the clade Eupulmonata (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Chtenopterygidae

Chtenopteryx is a genus of small, muscular, midwater squid in the monotypic family Chtenopterygidae. Four species are presently recognized in the genus, but more are believed to exist. [more]

Chuchlinidae

Chuchlinidae is an extinct family of fossil sea snails, marine gastropod mollusks in the clade Caenogastropoda. [more]

Cimidae

The Cimidae is a taxonomic family of sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia. [more]

Cingulopsidae

Cingulopsidae is a family of sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Cionellidae

[more]

Cirridae

Cirridae is an extinct family of fossil sea snails, marine gastropod mollusks in the superfamily Porcellioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Cirroteuthidae

Cirroteuthidae is a family of cirrate octopuses comprising three species in two genera. [more]

Cladiscitidae

[more]

Clausiliidae

Clausiliidae, common name door snails, are a taxonomic family of small, very elongate, mostly left-handed, air-breathing land snails, sinistral terrestrial pulmonate gastropod mollusks. [more]

Clavagellidae

Clavagellidae is a family of very unusual marine bivalves of the Pholadomyoida order. It contains nineteen species in two genera. [more]

Clavatulidae

Clavatulidae is a taxonomic family of sea snails, marine gastropod mollusks in the superfamily Conoidea. The family is not well differentiated morphologically. [more]

Cleidothaeridae

[more]

Clionidae

Clionidae is a family of sea angels, which are a group of pelagic marine gastropods. [more]

Clionitidae

[more]

Clionititidae

[more]

Cliopsidae

Cliopsidae, common name sea angels, are a taxonomic family of small free-swimming sea slugs, pelagic marine opisthobranch gastropod mollusks in the order Opisthobranchia. [more]

Clisospiridae

[more]

Clydonautilidae

The Clydonautilidae are Middle and Upper Triassic nautiloid cephalopods, which are derivatives of the clydonautlicean family Liroceratidae, that have generally smooth, involute, globular to compressed shells, characterized by a suture with prominent lobes and saddles. The family is known to contain five genera', These are: [more]

Clydoniceratidae

[more]

Clydonitidae

[more]

Clymeniidae

[more]

Clypeosectidae

Clypiosectidae is a family of small deepwater hydrothermal vent limpets, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Cocculinellidae

Cocculinellidae is a family of small sea snails, deepwater limpets, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Cocculinidae

Cocculinidae is a family of sea snails, deep-sea limpets, marine gastropod mollusks in the clade Cocculiniformia (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Cochlicellidae

[more]

Cochlicopidae

Cochlicopidae is a taxonomic family of small, air-breathing, land snails, terrestrial pulmonate gastropod mollusks in the superfamily Cochlicopoidea. [more]

Cochliopidae

Cochliopidae is a family of small freshwater snails with gills and an operculum, aquatic gastropod mollusks. [more]

Cochloceratidae

[more]

Cochlostomatidae

[more]

Codonocheilidae

[more]

Coeliaxidae

[more]

Coeloceratidae

Coeloceratidae is a family of ammonites belonging to the Eoderocerataceae] that lived during the Early Jurassic. Shells are evolute, tending to be broadly discoidal with depressed whorls bearing primary and secondary ribs that branch from outer lateral tubercles. Most of the included species have coronate inner whorls and outer tubercles only. In general, Coeloceratids resemble the Middle Jurassic Stephanoceras. Once regarded as the subfamily Coeloceratinae in the Eoderoceratidae, these ammonites are now given familial rank. [more]

Coelociontidae

Coelociontidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the clade Eupulmonata (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Coelostylinidae

[more]

Coilopoceratidae

[more]

Collignoniceratidae

[more]

Colombellinidae

Colombellinidae is an extinct family of sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Colubrariidae

Colubrariidae is a taxonomic family of medium-sized sea snails, marine gastropod mollusks in the superfamily Buccinoidea. This family has no subfamilies. [more]

Columbariidae

Columbariinae, also known as pagoda shells, are a subfamily of large deepwater sea snails, marine gastropod mollusks in the family Turbinellidae. Some 60 extant species have been described. [more]

Columbellidae

Columbellidae, common name the "dove snails" or "dove shells" are a family of minute to small sea snails, marine gastropod mollusks in the clade Neogastropoda. [more]

Condylocardiidae

Condylocardiidae is a family of small marine bivalve clams of the order Veneroida. [more]

Conidae

Conidae is a taxonomic family of minute to quite large sea snails, marine gastropod molluscs in the superfamily Conoidea. [more]

Conocardiidae

[more]

Conualeviidae

[more]

Cooperellidae

[more]

Coralliophilidae

Coralliophilinae is a taxonomic group, a subfamily of about 200?250 sea snails, marine gastropod mollusks commonly known as the coral snails or coral shells. This is a subfamily within the very large family Muricidae, the murex or rock snails. [more]

Corambidae

Corambidae is a family of sea slugs, dorid nudibranchs, marine gastropod mollusks in the superfamily Onchidoridoidea. This family is within the clade Euctenidiacea. [more]

Corbiculidae

The Corbiculidae, common name "basket clams", are a family of aquatic bivalve molluscs in the order Veneroida. [more]

Corbulidae

Corbulidae is a family of bivalve molluscs in the order Myoida. [more]

Coreospiridae

[more]

Corillidae

Corilla is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Plectopyloidea. [more]

Cornirostridae

The Cornirostridae is a taxonomic family of sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia. [more]

Cortinellidae

Cortinellidae is an extinct taxonomic family of fossil sea snails. [more]

Costasiellidae

Limapontiidae is a taxonomic family of small to minute sacoglossan sea slugs. These are marine opisthobranch gastropod mollusks. [more]

Costatoriidae

[more]

Costellariidae

Costellariidae sometimes called the "ribbed miters" is a taxonomic family of minute to medium-sized predatory sea snails, marine gastropod mollusks. This family of snails is also sometimes referred to as Vexillum miters. The main family of miter shells however is Mitridae, a closely related group. [more]

Cranchiidae

The family Cranchiidae comprises the approximately 60 species of glass squid, also known as cranchiid or cranch squid. Cranchiid squid occur in surface and midwater depths of open oceans around the world. They range in mantle length from 10 centimetres (3.9 in) to over 3 metres (9.8 ft), in the case of the Colossal Squid. The common name, glass squid, derives from the transparent nature of most species. Cranchiid squid spend much of their lives in partially sunlit shallow waters where their transparency provides camouflage. They are characterised by a swollen body and short arms, which bear two rows of suckers or hooks. The third arm pair is often enlarged. Many species are bioluminescent organisms and possess light organs on the undersides of their eyes, used to cancel their shadow. Eye morphology varies widely, ranging from large and circular to telescopic and stalked. A large fluid-filled chamber containing ammonia solution is used to aid buoyancy. Often the only organ that is visible through the transparent tissues is a cigar-shaped digestive gland, which is the cephalopod equivalent of a mammalian liver. This is usually held in a vertical position to reduce its silhouette and a light organ is sometimes present on the lower tip to further minimise its appearance in the water. [more]

Craspeditidae

[more]

Craspedopomatidae

Craspedopomatidae is a family of very small land snails with a gill and an operculum, terrestrial gastropod mollusks in the informal group Architaenioglossa belonging to the clade Caenogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Craspedostomatidae

[more]

Crassatellidae

Crassatellidae is a family of marine bivalve molluscs of the order Veneroida. [more]

Crassimarginatidae

[more]

Cravenoceratidae

[more]

Cryptaulacidae

[more]

Cryptoplacidae

[more]

Ctenopterygidae

[more]

Cucullaeidae

The false ark shells (Cucullaea) are a small genus of marine bivalve molluscs related to the ark clams. The genus is the only member of the family Cucullaeidae. [more]

Cultellidae

[more]

Cumanotidae

[more]

Cuspidariidae

Cuspidariidae is a family of bivalves in the order Pholadomyoida. [more]

Cuthonidae

[more]

Cyamiidae

Cyamiidae is a family of marine bivalve clams of the order Veneroida. [more]

Cyathermidae

[more]

Cycloceltitidae

[more]

Cycloconchidae

[more]

Cyclolobidae

Cyclolobidae: Goniatitid Ammonoidea belonging to the Cyclolobaceae with thickly discoidal to subgloblar shells with a small but open unbilicus and ammonitic sutures with numerous lobes that have subparallel sides. [more]

Cyclophoridae

Cyclophoridae is a taxonomic family of small to large tropical land snails with an operculum, terrestrial gastropod mollusks in the informal group Architaenioglossa belonging to the clade Caenogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Cyclostrematidae

Liotiidae is a family of small sea snails, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Cycloteuthidae

Cycloteuthidae is a family in the order Teuthida, comprising two genera. While physically dissimilar, molecular evidence supports the relatedness of the genera. The family is found primarily in mesopelagic tropical to subtropical waters. Cycloteuthidae is characterised by a triangular funnel locking apparatus. [more]

Cylichnidae

Cylichnidae, common name the "chalice bubble snails" or "canoe bubble snails" is a family of sea snails or bubble snails, marine gastropod mollusks in the superfamily Philinoidea. [more]

Cylindrellinidae

?Cylindrellinidae is an extinct family of air-breathing land snails, terrestrial pulmonate gastropod mollusks. [more]

Cylindrobullidae

Cylindrobulla is a genus of sea snails or bubble snails, marine gastropod mollusks in the clade Sacoglossa. [more]

Cylindroteuthididae

[more]

Cymaclymeniidae

[more]

Cymatiidae

[more]

Cymatoceratidae

[more]

Cymbitidae

[more]

Cymbuliidae

Cymbuliidae is a family of pelagic sea snails or "sea butterflies", marine gastropod mollusks in the superfamily Cymbulioidea. [more]

Cypraeidae

[more]

Cyrenoididae

Cyrenoididae is a family of bivalves. [more]

Cyrtoclymeniidae

[more]

Cyrtodontidae

[more]

Cyrtolitidae

[more]

Cyrtonellidae

[more]

Cystiscidae

Cystiscidae is a taxonomic family of minute sea snails, marine gastropod mollusks or micromollusks. [more]

Cystopeltidae

Cystopeltidae is a family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the superfamily Punctoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Cytiscidae

[more]

Dactylioceratidae

[more]

Damilinidae

[more]

Danubitidae

[more]

Daraelitidae

[more]

Dawsonellidae

Dawsonellidae is an extinct taxonomic family of fossil sea snails, marine, gastropod mollusks. [more]

Dawsonoceratidae

[more]

Decoritidae

[more]

Deianiridae

[more]

Delepinoceratidae

[more]

Delphinulopsidae

Delphinulopsidae is an extinct taxonomic family of fossil sea snails, marine, gastropod mollusks. [more]

Deltopectinidae

[more]

Dendrodorididae

Dendrodorididae is a taxonomic family of sea slugs, dorid nudibranchs, marine gastropod molluscs in the Superfamily Phyllidioidea. [more]

Dendronotidae

Dendronotidae is a family of sea slugs, nudibranchs, marine gastropod mollusks in the superfamily Tritonioidea. [more]

Dendropupidae

Dendropupidae is an extinct family of fossil sea snails, marine gastropod mollusks in the clade Caenogastropoda. [more]

Dentaliidae

Dentaliidae is a family of tusk shells in the order Dentaliida. [more]

Desmoceratidae

Desmoceratidae is a family belonging to the ammonite subclass. They are an extinct group of ammonoids, shelled cephalopods related to squid, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids. [more]

Desmopteridae

Desmopteridae is a family of pelagic sea snails or "sea butterflies", marine gastropod mollusks in the superfamily Cymbulioidea. [more]

Dialidae

Dialidae, common name dialids, is a family of sea snails, marine gastropod molluscs in the clade Sorbeoconcha. [more]

Diaphanidae

[more]

Diastomatidae

[more]

Diastomidae

[more]

Dicoelitidae

[more]

Dictyoconitidae

[more]

Dieneroceratidae

[more]

Dimeroceratidae

[more]

Dimitobelidae

[more]

Dimorphoceratidae

[more]

Dimyidae

Dimyidae is a family of bivalve molluscs, related to the scallops and oysters. [more]

Dinaritidae

[more]

Diplobelidae

[more]

Diplommatinidae

Diplommatinidae is a family of small land snails with an operculum, terrestrial gastropod mollusks in the superfamily Cyclophoridae. [more]

Diplomoceratidae

[more]

Dironidae

Dironidae is a family of nudibranchs, marine gastropod molluscs, in the clade Euthyneura. There are no subfamilies in Dironidae. [more]

Discidae

Discidae is a taxonomic family of small air-breathing land snails, terrestrial gastropod mollusks in the superfamily Punctoidea. [more]

Discodorididae

Discodorididae is a taxonomic family of sea slugs, specifically dorid nudibranchs, marine gastropod mollusks in the superfamily Doridoidea. [more]

Discohelicidae

Discohelicidae is an extinct family of sea snails with planispiral shells, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Distichitidae

[more]

Dolomitellidae

The Dolomitellidae is an extinct taxonomic family of fossil sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia. [more]

Donacidae

Donacidae, the bean clams or wedge shells, is a family of bivalve molluscs of the order Veneroida. The family is related to the Tellins. [more]

Donaldinidae

[more]

Dondersiidae

[more]

Dorcasiidae

Dorcasiidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Acavoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Dorididae

Sea lemon is a loosely-applied common name for a group of medium-sized to large shell-less colorful sea slugs or nudibranchs, specifically dorid nudibranchs in the taxonomic family Dorididae and other closely related families. These are marine gastropod mollusks. [more]

Doridomorphidae

Doridomorphidae is a taxonomic family of colorful sea slugs or nudibranchs. They are marine gastropod molluscs. [more]

Doridoxidae

[more]

Dorsoplantidae

[more]

Dotidae

Dotidae are a taxonomic family of small sea slugs, nudibranchs, shell-less marine gastropod molluscs in the order Opisthobranchia. [more]

Dotoidae

Dotidae are a taxonomic family of small sea slugs, nudibranchs, shell-less marine gastropod molluscs in the order Opisthobranchia. [more]

Douvilleiceratidae

[more]

Draparnaudiidae

Draparnaudia is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Partuloidea. [more]

Dreissenidae

The Dreissenidae are a family of small freshwater mussels, aquatic bivalve mollusks. They attach themselves to stones or to any other hard surface using a byssus. [more]

Drepanomeniidae

[more]

Drilliidae

Drilliidae is a taxonomic family of small sea snails, marine gastropod mollusks in the superfamily Conoidea. [more]

Duvaliidae

[more]

Dyakiidae

Dyakiidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Dyakioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Dzhulfitidae

[more]

Eatoniellidae

Eatoniellidae, commonly known as eatoniellids, are a taxonomic family of minute sea snails, marine gastropod molluscs in the superfamily Cingulopsoidea. [more]

Ebalidae

Murchisonellidae is a taxonomic family of sea snails, marine opisthobranch gastropod mollusks in the superfamily Pyramidelloidea. [more]

Echioceratidae

[more]

Elachisinidae

Elachisinidae is a family of sea snails, marine gastropod molluscs in the superfamily Rissooidea and the clade Littorinimorpha. [more]

Elachisnidae

[more]

Elasmonematidae

[more]

Ellesmeroceratidae

[more]

Ellobiidae

Ellobiidae is a family of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the clade Eupulmonata. This is the only family in the superfamily Ellobioidea, according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Elonidae

Elonidae is a family of air-breathing land snails, terrestrial pulmonate gastropods mollusks in the superfamily Helicoidea. [more]

Elysiidae

Placobranchidae is a family of sea slugs, marine opistobranch gastropod mollusks. They superficially resemble nudibranchs but they are sacoglossans, members of the clade Sacoglossa within the Opisthobranchia. [more]

Emblandidae

[more]

Embletoniidae

[more]

Endoceratidae

[more]

Endodontidae

Endodontidae is a taxonomic family of very small air-breathing land snails and slugs, terrestrial pulmonate gastropod mollusks in the superfamily Punctoidea. [more]

Engonoceratidae

[more]

Enidae

Enidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks. [more]

Enoploteuthidae

Enoploteuthidea is a family of squid comprising approximately 40 species in 4 genera. Most species have a mantle length ranging from 3-13 cm. Hooks are present on all arms and tentacles. The family is best known for the large array of photophores throughout the body. [more]

Entalinidae

Entalinidae is a scaphopod family in the order Gadilida. [more]

Entoliidae

Entoliidae is a family of bivalves that are related to oysters and scallops. The family contains at least seven species in five different genera. [more]

Eoderoceratidae

[more]

Eopteriidae

[more]

Eotomariidae

Eotomariidae is an extinct family of gastropods in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Epigridae

[more]

Epimeniidae

[more]

Epiphragmophoridae

[more]

Episageceratidae

[more]

Epitoniidae

Wentletraps are small, often white, very high-spired, predatory or ectoparasitic sea snails, marine gastropod mollusks, in the family Epitoniidae. [more]

Erycinidae

[more]

Estonioceratidae

[more]

Etheriidae

Etheriidae is a family of medium-sized freshwater mussels, aquatic bivalve mollusks in the order Unionoida. [more]

Eubranchidae

Eubranchidae is a taxonomic family of sea slugs, marine gastropod mollusks in the superfamily Aeolidioidea, the aeolid nudibranchs. [more]

Eucochlidae

[more]

Euconulidae

[more]

Eucyclidae

[more]

Eulimidae

Eulimidae is a family of very small parasitic sea snails, marine gastropod mollusks in the superfamily Eulimoidea. [more]

Eumetulidae

[more]

Euomphalidae

Euomphalidae is an extinct family of Paleozoic marine molluscs which may be gastropods with anisostrophically coiled shells (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). The shells show a selenizone. [more]

Euphemitidae

Euphemitidae is an extinct family of Paleozoic fossil molluscs of uncertain position. They have isostrophically coiled shells and may be either Gastropoda sea (snail)s, or Monoplacophora. [more]

Eustomatidae

[more]

Facelinidae

Facelinidae is a taxonomic family of colorful sea slugs. These are specifically aeolid nudibranchs. They are marine gastropod molluscs. [more]

Falcidentidae

[more]

Falsicingulidae

Falsicingulidae is a family of very small sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Fasciolaridae

[more]

Fasciolariidae

Fasciolariidae, common name the "tulip snails and spindle snails", is a family of small to large sea snails, marine gastropod mollusks in the superfamily Buccinoidea. [more]

Fayettevilleidae

[more]

Ferganoceratidae

[more]

Ferreiraellidae

[more]

Ferrussaciidae

[more]

Ferussaciidae

Ferussaciidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Achatinoidea. [more]

Ferussinidae

[more]

Ficidae

Ficidae, common name the fig shells are a family of medium to large marine gastropods. It is the only family in the superfamily Ficoidea. [more]

Filholiidae

[more]

Fimbriidae

Fimbriidae is a family of Bivalves. Some modern studies indicate that Fimbriidae should be included in the family Lucinidae. The family contains one recent genus Fimbria with two known species. [more]

Fionidae

Fiona pinnata, common name Fiona, is a species of small pelagic sea slug, specifically a nudibranch, a marine gastropod mollusk in the superfamily Fionoidea. This nudibranch species lives worldwide on floating objects on seas, and feeds mainly on barnacles, specifically goose barnacles in the genus Lepas. [more]

Fissurellidae

Fissurellidae, common name the keyhole limpets and slit limpets, is a taxonomic family of limpet-like sea snails, marine gastropod molluscs in the clade Vetigastropoda. [more]

Flabellinidae

Flabellinidae is a taxonomic family of brightly-colored sea slugs, specifically nudibranchs, marine gastropod mollusks. [more]

Flemingitidae

[more]

Fordillidae

[more]

Fossaridae

[more]

Fustiariidae

[more]

Gadilidae

Gadilidae is a family of tusk shells in the order Dentaliida. [more]

Gadilinidae

[more]

Gaimardiidae

[more]

Galatheavalvidae

[more]

Galeommatidae

Galeommatidae is a family of small and very small clams or bivalve molluscs in the order Veneroida. They are related to the zebra mussels. [more]

Ganitidae

[more]

Gastrioceratidae

[more]

Gastrochaenidae

Gastrochaenidae is a family of bivalve molluscs in the unassigned , containing the following genera: [more]

Gastrodontidae

[more]

Gastropteridae

Gastropteridae is a family of sea slugs, gastropod mollusks in the superfamily Philinoidea of the clade Cephalaspidea, the headshield slugs and bubble snails. [more]

Gattendorfiidae

Gattendorfiidae is one of seven families of the Prionocerataceae families, a member of the Goniatitida order. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids. [more]

Gaudryceratidae

[more]

Geisonoceratidae

[more]

Geopeltididae

[more]

Girtyoceratidae

[more]

Glacidorbidae

The Glacidorbidae is a taxonomic family of freshwater snails, gastropod mollusks in the clade Panpulmonata. [more]

Glaphyritidae

[more]

Glatziellidae

[more]

Glaucidae

Glaucidae is a taxonomic family of colorful sea slugs. These are specifically aeolid nudibranchs. They are marine gastropod molluscs in the superfamily Aeolidioidea. [more]

Glauconiidae

[more]

Glauconomidae

[more]

Glossidae

Glossidae is a family of Bivalves. [more]

Glycymerididae

[more]

Glyptarcidae

[more]

Gonatidae

The Gonatidae, also known as armhook squid, are a family of moderately-sized squid. The family contains approximately 19 species in three genera, widely distributed and plentiful in cold boreal waters of the Pacific Ocean. At least one species is known from Antarctic waters, and two from the North Atlantic. [more]

Goniaeolididae

[more]

Goniasmatidae

[more]

Goniatitidae

Goniatitidae is one of three families of the Goniatitaceae superfamilies. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids. [more]

Gonieolididae

[more]

Gonioceratidae

[more]

Gonioclymeniidae

[more]

Goniodorididae

Goniodorididae are a taxonomic family of sea slugs, specifically dorid nudibranchs, marine gastropod molluscs in the order Opisthobranchia. [more]

Gonioloboceratidae

[more]

Gordenellidae

[more]

Gorgoleptidae

[more]

Gosseletinidae

Gosseletinidae is an extinct family of sea snails, marine gastropod molluscs in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Grammysiidae

[more]

Grandostomatidae

[more]

Grangerellidae

[more]

Graphoceratidae

[more]

Grimpoteuthididae

The octopuses of the genus Grimpoteuthis are also known as Dumbo octopuses from the ear-like fins protruding from the top of their head-like bodies, resembling the ears of Walt Disney's flying elephant Dumbo. They are bathyal creatures, living at extreme depths of 3,000 to 4,000 metres (9,800 to 13,000 ft), with some living up to 7,000 metres (23,000 ft) below sea level, which is the deepest of any known octopus.[] They are some of the rarest of the Octopoda species. They can flush the transparent layer of their skin at will, and are pelagic animals, as with all other cirrate octopuses. The largest Dumbo octopus ever recorded was 6 feet (1.8 m) in length and weighed 13 pounds (5.9 kg), although the normal size for the various species is thought to be smaller. [more]

Groenlandibelidae

[more]

Gryphaeidae

Gryphaeidae, common name the foam oysters or honeycomb oysters, is a family of marine bivalve mollusks, related to the true oysters. [more]

Gryphochitonidae

[more]

Grypoceratidae

[more]

Gymnitidae

[more]

Gymnodorididae

Gymnodorididae is a taxonomic family of sea slugs, dorid nudibranchs, gastropod molluscs in the superfamily Polyceroidea. [more]

Gymnomeniidae

[more]

Halgerdidae

[more]

Haliotidae

Abalone ( or /??b?'lo?ni?/; from Spanish abul?n), from (Rumsen) aul?n, are small to very large-sized edible sea snails, marine gastropod molluscs in the family Haliotidae and the genus Haliotis. Common names for abalones also include ear-shells, sea ears, as well as muttonfish or muttonshells in Australia, ormer in Great Britain, perlemoen and venus's-ears in South Africa and paua in New Zealand. [more]

Haliotididae

[more]

Halobiidae

[more]

Haloceratidae

Haloceratidae is a family of sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Halolimnohelicidae

[more]

Haloritidae

[more]

Hamineidae

[more]

Haminoeidae

[more]

Hamitidae

[more]

Hammatoceratidae

[more]

Hancockiidae

Hancockiidae is a family of sea slugs, nudibranchs, marine gastropod mollusks in the superfamily Tritonioidea. [more]

Hanleyidae

Hanleya is a genus of polyplacophoran mollusc known from Oligocene and Miocene fossils; it is represented today by a number of species including H. sinica Xu 1990 (China), H. brachyplax (Brazil) and H. hanleyi Bean in Thorpe, 1844 (Chile), which feeds on sponges. [more]

Haploceratidae

[more]

Haplotrematidae

Haplotrematidae is a taxonomic family of predatory air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Rhytidoidea. [more]

Harpidae

Harpidae, common name the harp snails, is a taxonomic family of large predatory sea snails, marine gastropod mollusks. [more]

Hastitidae

[more]

Hedenstroemiidae

[more]

Hedylopsidae

[more]

Helcionellidae

[more]

Helicarionidae

Helicarionidae is a family of air-breathing land snails or semi-slugs, terrestrial pulmonate gastropod mollusks in the superfamily Helicarionoidea. [more]

Helicellidae

[more]

Helicidae

The Helicidae, sometimes known as the typical snails, are a taxonomic family of small to large, air-breathing, land snails. In other words, they are terrestrial pulmonate gastropod mollusks. [more]

Helicinidae

[more]

Helicodiscidae

Helicodiscidae is a family of small air-breathing land snails, terrestrialpulmonate gastropod mollusks in the superfamily Punctoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Helicodontidae

[more]

Helicostoidae

[more]

Helicotomidae

[more]

Helixarionidae

[more]

Helminthoglyptidae

The Helminthoglyptidae are a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea. [more]

Hematitidae

[more]

Hemidonacidae

[more]

Hemimeniidae

[more]

Hemiphragmoceratidae

[more]

Hemithecellidae

[more]

Hercoglossidae

[more]

Hermaeidae

[more]

Heroidae

Heroidae is a family of sea slugs, nudibranchs, marine gastropod molluscs in the clade Nudipleura. There are no subfamilies in Heroidae. [more]

Heteroceratidae

[more]

Heterodorididae

Arminidae is a family of sea slugs, marine gastropod mollusks in the superfamily Arminoidea. [more]

Heteroherpiidae

[more]

Heteroneritidae

[more]

Heterosubulitidae

[more]

Hexabranchidae

Hexabranchidae is a taxonomic family of the colorful sea slugs which are known as nudibranchs. They are marine gastropod mollusks. [more]

Hiatellidae

Hiatellidae is a taxonomic family of small saltwater clams, marine bivalve molluscs. This family is placed in the unassigned . [more]

Hildoceratidae

[more]

Himalayitidae

[more]

Hippocardiidae

[more]

Hipponicidae

Hipponicidae, common name hoof shells or hoof snails, is a family of small sea snails, limpet-like marine gastropod molluscs in the superfamily Vanikoroidea. [more]

Hippuritidae

[more]

Histioteuthidae

Histioteuthis is a genus of squid and the only member of the Histioteuthidae family. It goes by the English name cock-eyed squid, because in all species the right eye is normal-sized, round, blue and sunken; whereas the left eye is at least twice the diameter of the right eye, tubular, yellow-green, faces upward, and bulges out of the head. [more]

Holcodiscidae

[more]

Holopeidae

[more]

Homoceratidae

Homoceratidae is one of five families of the Gastriocerataceae superfamily. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids. [more]

Homoiodorididae

[more]

Hoplitidae

[more]

Hormotomidae

[more]

Huananoceratidae

[more]

Humboldtianidae

Humboldtianidae is an American family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Hungaritidae

[more]

Huroniidae

[more]

Hyalogyrinidae

[more]

Hydriidae

[more]

Hydrobiidae

Hydrobiidae, common name mud snails, is a large cosmopolitan taxonomic family of very small freshwater snails and brackish water snails that have an operculum, aquatic gastropod mollusks in the clade Littorinimorpha. [more]

Hydrocenidae

Hydrocenidae is a poorly-known taxonomic family of minute land snails or cave snails with an operculum, terrestrial gastropod mollusks or micromollusks in the clade Cycloneritimorpha. [more]

Hydrococcidae

[more]

Hydromylidae

[more]

Hygromiidae

Hygromiidae is a taxonomic family of small to medium-sized air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea. [more]

Hypseloconidae

[more]

Hyriidae

Hyriidae is a family of pearly freshwater mussels in the order Unionoida native to South America, Australia, New Zealand and New Guinea. Like all members of that order, they go through a larval stage that is parasitic on fish. The classification recognized by Banarescu (1990) uses three subfamilies. This family contains eighteen genera. [more]

Icanotiidae

[more]

Idioctopodidae

[more]

Idiosepiidae

Idiosepius is a genus of bobtail squid encompassing around eight species. It is the sole genus of the family Idiosepiidae. [more]

Igarkiellidae

[more]

Ilbiidae

[more]

Ildicidae

[more]

Imeroherpiidae

[more]

Imoglobidae

[more]

Inoceramidae

Inoceramidae was a family of prehistoric clams. Inoceramids tended to live in upper bathyal and neritic environments. In Alaska's Matanuska Formation, the most abundant mollusks in the quarry containing the Talkeetna Mountains Hadrosaur were inoceramids. [more]

Intoceratidae

[more]

Iravadiidae

Iravadiidae is a family of minute sea snails, marine gastropod molluscs in the superfamily Rissooidea and the clade Littorinimorpha. [more]

Ischnochitonidae

Ischnochitonidae is an extinct[] family of polyplacophoran mollusc. [more]

Ischnoptygmatidae

[more]

Ischyriniidae

[more]

Isognomidae

[more]

Isognomonidae

Pteriidae is a family of medium-sized to large saltwater clams. They are pearl oysters, marine bivalve mollusks in the order Pterioida. [more]

Isospiridae

[more]

Janolidae

Proctonotidae is a family of nudibranchs, marine gastropod molluscs, in the clade Euthyneura. [more]

Janthinidae

Janthinidae, common name the purple snails or violet snails, are a family of pelagic sea snails, marine gastropod mollusks in the informal group Ptenoglossa of the clade Hypsogastropoda. [more]

Joannitidae

[more]

Johnwyattiidae

[more]

Joubiniteuthidae

Joubin's Squid (Joubiniteuthis portieri) is a rare, small squid found in both the Atlantic Ocean, Pacific Ocean and in rare cases, the Indian Ocean. The species is named after Louis Joubin, a French zoologist. It is known to reach a mantle length of 9 cm. [more]

Juliidae

Juliidae, common name the bivalved gastropods, is a family of minute sea snails, marine gastropod mollusks or micromollusks in the superfamily Oxynooidea, an opisthobranch group. [more]

Juraphyllitidae

[more]

Juvavitidae

[more]

Kelliellidae

[more]

Kelliidae

[more]

Kentrodorididae

[more]

Khairkhaniidae

[more]

Khvalynitidae

[more]

Kirsoceratidae

[more]

Kittlidiscidae

[more]

Klamathitidae

[more]

Koninckioceratidae

The Koninckioceratidae comprise a collection of nautilid genera, typically with more or less evolute shells with depressed whorl sections, that are combined as a family within the Tainocerataceae. As perceived, the Koninckioceratidae contains 11 genera and lasted from the Early Mississippian to about the end of the Permian. [more]

Kosmoceratidae

[more]

Kosmoclymeniidae

[more]

Kossmaticeratidae

[more]

Kuskokwimiidae

[more]

Ladamarekiidae

[more]

Ladinulidae

[more]

Laevidentaliidae

[more]

Laevipilinidae

[more]

Laginiopsidae

[more]

Lahillidae

[more]

Lamellariidae

Lamellariinae is a subfamily of small slug-like sea snails, marine gastropod molluscs belonging to the family Velutinidae, in the clade Littorinimorpha. [more]

Lamellidorididae

[more]

Lamelliphoridae

[more]

Lametilidae

Lametilidae is a family of bivalves. The family is related to the nut clams (Nuculidae). [more]

Lanascalidae

[more]

Lasaeidae

Lasaeidae is a family of bivalve molluscs, related to the Zebra mussels. They are commonly called kellyclams. [more]

Latanarcestidae

[more]

Laternulidae

Laternulidae, common name lantern clams, is a family of saltwater clams, marine bivalve mollusks in the order Pholadomyoida. [more]

Latiidae

[more]

Laubellidae

[more]

Laubierinidae

[more]

Lauriidae

[more]

Lecanitidae

[more]

Leiopectinidae

[more]

Lepetellidae

Lepetellidae is a taxonomic family of small deepwater sea snails or limpets, marine gastropod molluscs in the superfamily Lepetelloidea in the clade Vetigastropoda (according taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). (It was in order Cocculiniformia before.) [more]

Lepetidae

Lepetidae is a family of sea snails or small, deep-water true limpets, marine gastropod molluscs in the clade Patellogastropoda the true limpets. [more]

Lepetodrilidae

[more]

Lepetopsidae

[more]

Lepidochitonidae

[more]

Lepidomeniidae

[more]

Lepidopleuridae

[more]

Lepidoteuthidae

The Grimaldi Scaled Squid (Lepidoteuthis grimaldii) is a large squid growing to 1 m in mantle length. It is named after the Grimaldi family, reigning house of Monaco. Prince Albert I of Monaco was an amateur teuthologist who pioneered the study of deep sea squids by collecting the 'precious regurgitations' of sperm whales. The Grimaldi Scaled Squid was first collected from the stomach contents of a whale.[] [more]

Leptochitonidae

Leptochitonidae is an extinct[] family of polyplacophoran mollusc. [more]

Leptonidae

[more]

Leptotheuthididae

[more]

Les Poulpes

Lesueurillidae

[more]

Liareidae

Liareinae is a taxonomic subfamily of small land snails, terrestrial pulmonate gastropod molluscs in the family Pupinidae. [more]

Limacidae

Limacidae, common name the keelback slugs, are a taxonomic family of medium-sized to very large, air-breathing land slugs, terrestrial pulmonate gastropod molluscs in the superfamily Limacoidea. [more]

Limacinidae

Limacinidae is a family of small sea snails, pteropods, pelagic marine gastropod mollusks in the clade Thecosomata (sea butterflies). [more]

Limapontiidae

Limapontiidae is a taxonomic family of small to minute sacoglossan sea slugs. These are marine opisthobranch gastropod mollusks. [more]

Limidae

Limidae is the only family of bivalve molluscs in the suborder Limoida. [more]

Limifossoridae

[more]

Limopsidae

[more]

Lioteuthididae

[more]

Liotiidae

[more]

Liparoceratidae

[more]

Liroceratidae

[more]

Lissoceratidae

[more]

Lithoglyphidae

[more]

Litiopidae

Litiopidae, common name litiopids, is a family of small sea snails, marine gastropod molluscs in the clade Sorbeoconcha. [more]

Littorinidae

Littorinidae is a taxonomic family of over 200 species of sea snails, marine gastropod molluscs in the clade Littorinimorpha, commonly known as periwinkles and found world-wide. [more]

Littorinididae

[more]

Lituitidae

[more]

Liuchengoceratidae

[more]

Livorniellidae

[more]

Lobitidae

[more]

Loliginidae

Loliginidae, commonly known as pencil squids, is an aquatic family of the order Teuthida (squid). [more]

Loligosepiidae

[more]

Lomanotidae

Lomanotidae is a family of sea slugs, marine gastropod mollusks in the superfamily Tritonioidea. [more]

Longobarditidae

[more]

Lophospiridae

Lophospiridae is an extinct taxonomic family of sea snails, marine gastropod molluscs. [more]

Lottidae

[more]

Lottiidae

Lottiidae is a family of sea snails, specifically true limpets, marine gastropod mollusks in the superfamily Lottioidea and the clade Patellogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Loxonematidae

Loxonematidae is an extinct taxonomic family of sea snails, marine gastropod molluscs. [more]

Luciellidae

[more]

Lucinidae

Lucinidae is a family of saltwater clams, marine bivalve molluscs. [more]

Lunulacardiidae

[more]

Luteuthididae

Luteuthis dentatus, also known as Lu's Jellyhead, is a medium-sized species of cirrate octopus found near New Zealand. [more]

Lycoteuthidae

Lycoteuthidae is a family of squid comprising four known genera in two subfamilies. They are characterised by a lack of hooks and by photophores present on the viscera, eyeballs and tentacles. [more]

Lyelliceratidae

[more]

Lymnaeidae

Lymnaeidae is a taxonomic family of small to large air-breathing freshwater snails, aquatic pulmonate gastropod mollusks, that belong to the clade Hygrophila. [more]

Lyonsiidae

Lyonsiidae is a family of small saltwater clams, marine bivalves of the Anomalodesmata order. [more]

Lyrodesmatidae

[more]

Lytoceratidae

[more]

Macellomeniidae

[more]

Macluritidae

[more]

Macrocephalitidae

[more]

Macrocyclidae

[more]

Macroscaphitidae

[more]

Mactridae

Mactridae, also known as trough shells or duck clams, is a family of marine clams of the order Veneroida. [more]

Mactromyidae

[more]

Madrellidae

Madrellidae is a family of nudibranchs, marine gastropod molluscs, in the clade Nudipleura. There are no subfamilies in Madrellidae. [more]

Magilidae

Coralliophilinae is a taxonomic group, a subfamily of about 200?250 sea snails, marine gastropod mollusks commonly known as the coral snails or coral shells. This is a subfamily within the very large family Muricidae, the murex or rock snails. [more]

Magnapinnidae

The bigfin squids are a group of rarely seen cephalopods with a distinctive morphology. They are placed in the genus Magnapinna and family Magnapinnidae. The family is known only from larval, paralarval, and juvenile specimens, but some authorities believe the adult creature has been seen: several videos have been taken of animals nicknamed the "long-arm squid", which appear to have a similar morphology. Since none of the adult specimens have ever been captured or sampled, it remains uncertain if they are the same genus, or only distant relatives. [more]

Maizaniidae

[more]

Malleidae

Malleidae, or the hammer oysters, is a family of saltwater clams. They are related to the pearl oysters, in the order Pterioida. [more]

Malletiidae

Malletiidae is a family of bivalves in the order Nuculanoida. [more]

Mandaloceratidae

[more]

Mandeliidae

[more]

Manzanellidae

Manzanellidae is a family of bivalves, in the order solemyoida. [more]

Maoraxidae

[more]

Marathonitidae

[more]

Margaritiferidae

Margaritiferidae is a family of medium-sized freshwater mussels, aquatic bivalve mollusks in the order Unionoida. They are known as freshwater pearl mussels, because they are capable of producing pearls. [more]

Marginellidae

Marginellidae, or the margin shells, are a taxonomic family of small, often colorful, sea snails, marine gastropod molluscs in the clade Neogastropoda. [more]

Marianinidae

[more]

Mastigophoridae

[more]

Mastigoteuthidae

The Mastigoteuthidae, also known as whip-lash squid, are a family of small deep-sea squid. Approximately 20 known species in two genera are represented, with members found in both the mesopelagic and bathypelagic zone of most oceans. Originally described by Verill in 1881, it was later lowered by Chun (1920) to a subfamily (Mastigoteuthinae) of the Chiroteuthidae, which are also called whip-lash squid on occasion. However, Roper et al. (1969) raised it back to the family level, and this has not been changed since. [more]

Mathildidae

Mathildidae is a family of minute sea snails, marine gastropod molluscs in the informal group of the Lower Heterobranchia. [more]

Mattheviidae

[more]

Maturifusidae

[more]

Maxigoniatitidae

[more]

Medlicottiidae

[more]

Meekoceratidae

[more]

Meekospiridae

[more]

Megalobulimidae

Megalobulimus is a genus of air-breathing land snail, a terrestrial gastropod mollusk in the subfamily within the family Strophocheilidae (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Megalomastomatidae

[more]

Megaphyllitidae

[more]

Megaspiridae

Megaspiridae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Orthalicoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Megomphicidae

Megomphicidae is a taxonomic family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Acavoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Meiomeniidae

[more]

Melagathiceratidae

[more]

Melampidae

[more]

Melanellidae

[more]

Melaniidae

[more]

Melanodrymiidae

[more]

Melanopsidae

Melanopsidae, common name melanopsids, is a family of freshwater gastropods in the clade Sorbeoconcha. Species in this family are native to southern and eastern Europe, northern Africa, parts of the Middle East, New Zealand, and freshwater streams of some large South Pacific islands. [more]

Melongenidae

Melongenidae, the crown conchs, busycon whelks and their relatives, are a taxonomic family of large to very large marine gastropods in the clade Neogastropoda. [more]

Mesocochliopidae

[more]

Mesodesmatidae

Mesodesmatidae is a family of marine bivalve clams of the order Veneroida. [more]

Metacerithiidae

[more]

Metachaetodermatidae

[more]

Metalegoceratidae

[more]

Metasibiritidae

[more]

Metoptomatidae

[more]

Miamiridae

[more]

Micractaeonidae

[more]

Microdomatidae

[more]

Microhedylidae

Microhedylidae are a taxonomic family of sea slugs, marine gastropod mollusks within the clade Acochlidiacea. [more]

Milacidae

Milacidae is a family of air-breathing, keeled, land slugs. These are shell-less terrestrial gastropod mollusks in the superfamily Parmacelloidea. [more]

Mimagoniatitidae

[more]

Mimoceratidae

[more]

Mimosphinctidae

[more]

Minicheviellidae

[more]

Misurinellidae

[more]

Mitridae

Mitridae, known as mitre shells, are a taxonomic family of sea snails, widely distributed marine gastropod molluscs in the clade Neogastropoda. [more]

Modiomorphidae

[more]

Modulidae

Modulidae, common name modulids, is a family of small sea snails, marine gastropod molluscs in the superfamily Cerithioidea. [more]

Moitessieriidae

Moitessieriidae is a family of small freshwater snails, aquatic gastropod molluscs in the superfamily Rissooidea. [more]

Monadeniidae

[more]

Monoplacophoridae

[more]

Monopleuridae

[more]

Monopteriidae

[more]

Monotidae

[more]

Montacutidae

[more]

Mopaliidae

Mopaliidae is an extinct[] family of polyplacophoran mollusc. [more]

Morphoceratidae

[more]

Muensterellidae

[more]

Muensteroceratidae

[more]

Muniericeratidae

[more]

Murchisonellidae

[more]

Murchisoniidae

Murchisoniidae is an extinct family of fossil gastropods in the superfamily Murchisonioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Muricidae

Muricidae, common name murex snails or rock snails, is a large and varied taxonomic family of small to large predatory sea snails. With approximately 1,600 living species the Muricidae represent almost 10% of the Neogastropoda. Additionally, 1,200 fossil species have been recognised (Merle et al. 2011). There are numerous subfamilies, although experts disagree about the subfamily divisions. Many muricids have unusual shells which are considered attractive by shell collectors and by interior designers. [more]

Mutelidae

Iridinidae is a family of medium-sized freshwater mussels, aquatic bivalve mollusks in the order Unionoida. [more]

Myalinidae

[more]

Mycetopodidae

The Mycetopodidae are a family of freshwater pearly mussels in the order Unionoida restricted to South America. They are named for the mushroom-like shape of their foot. Like all members of the Unionoida they reproduce via a larval stage that temporarily parasitizes fish. Banarescu lists the following subfamilies and genera. [more]

Myidae

Myidae (the softshell clams) is a family of bivalve molluscs in the order Myoida. [more]

Myochamidae

[more]

Myopholadidae

[more]

Myophoricardiidae

[more]

Myophoriidae

[more]

Myrrhinidae

[more]

Mysidiellidae

[more]

Mytilidae

Mytilidae is a family of small to large saltwater mussels, marine bivalve mollusks in the order Mytiloida. It is the only family in the order. This order (and family) contains 32 genera. [more]

Nacellidae

Nacellidae is a taxonomic family of sea snails or true limpets, marine gastropod molluscs in the clade Patellogastropoda. [more]

Naricopsinidae

[more]

Nassaridae

[more]

Nassariidae

Nassariidae, common name nassa mud snails (USA), or dog whelks (UK), are a taxonomic family of small to medium-sized sea snails, marine gastropod mollusks in the clade Neogastropoda. [more]

Nathorstitidae

[more]

Naticidae

Naticidae, common name the moon snails, is a family of minute to large-sized predatory sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Nautilidae

Nautilus (from Greek ?a?t????, 'sailor') is the common name of marine creatures of cephalopod family Nautilidae, the sole extant family of the superfamily Nautilaceae and of its smaller but near equal suborder, Nautilina. It comprises six living species in two genera, the type of which is the genus Nautilus. Though it more specifically refers to species Nautilus pompilius, the name chambered nautilus is also used for any species of the Nautilidae. [more]

Neilonellidae

[more]

Neocomitidae

[more]

Neocyclotidae

Neocyclotidae is a family of tropical land snails with gills and an operculum, terrestrial gastropod mollusks in the informal group Architaenioglossa belonging to the clade Caenogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Neodimorphoceratidae

[more]

Neoglyphioceratidae

[more]

Neoicoceratidae

[more]

Neolepetopsidae

Neolepetopsidae is a family of small deep sea sea snails or true limpets, marine gastropod mollusks in the clade Patellogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Neoleptonidae

Neoleptonidae is a family of marine bivalve clams of the order Veneroida. [more]

Neomeniidae

[more]

Neomphalidae

Neomphalidae is a family of sea snails or limpets, specifically deep sea hydrothermal vent limpets. This family is included in the Vetigastropoda, which is a clade according to the Bouchet & Rocroi, 2005. No subfamilies are included in this family. [more]

Neopilinidae

[more]

Neostacheoceratidae

[more]

Neoteuthidae

Neoteuthidae is a family of squid comprising four monotypic genera. [more]

Nephriticeratidae

[more]

Neptuneidae

[more]

Nerineidae

The Nerineidae is an extinct taxonomic family of fossil sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia. [more]

Nerinellidae

[more]

Neritidae

Neritidae, common name the nerites, is a taxonomic family of small to medium-sized saltwater and freshwater snails which have a gill and a distinctive operculum, marine, brackish water and freshwater gastropod mollusks in the order Neritoida. [more]

Neritiliidae

[more]

Neritopsidae

Neritopsidae is a family of small sea snails and freshwater snails in the clade Cycloneritimorpha (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Nerrhenidae

[more]

Newtoniellidae

[more]

Nierstraziellidae

[more]

Nododelphinulidae

[more]

Noetiidae

Noetiidae is a family of bivalves related to the ark clams. They are differentiated from the ark clams by the presence of striations on the hinge ligament. They usually grow to around 6 cm in length, with 10 cm the maximum. [more]

Nomismoceratidae

[more]

Nostoceratidae

[more]

Notaeolidiidae

[more]

Notarchidae

[more]

Notobranchaeidae

Notobranchaeidae is a taxonomic family of floating sea slugs or "sea angels", pelagic marine opisthobranch gastropod mollusks. [more]

Notodiaphanidae

[more]

Notodorididae

[more]

Nowakiidae

[more]

Nucinellidae

[more]

Nuculanidae

Nuculanidae is a family of small saltwater clams, marine bivalve molluscs in the order Nuculanoida. Species in this family are found in all seas, from shallow to deep water. [more]

Nuculidae

Nuculidae is a family of small saltwater clams in the order Nuculoida. Species in this family are commonly known as nut clams. [more]

Nystiellidae

[more]

Obtortionidae

Obtortionidae is a family of sea snails, marine gastropod molluscs in the superfamily Cerithioidea, that is within the clade or in clade Sorbeoconcha. [more]

Octopodidae

Octopodidae is the family containing the majority of known octopus species. [more]

Octopoteuthidae

Octopoteuthidae is a family of squid comprising two genera. The family is characterised by tentacles which cease to grow after the paralarval stage; and the use of a penis, instead of a hectocotylus. [more]

Ocythoidae

The Tuberculate Pelagic Octopus (Ocythoe tuberculata), also known as the Football Octopus, is a pelagic species that is found in warm and temperate seas, especially in the northern hemisphere. It is the only known species in the family Ocythoidae. [more]

Oecoptychiidae

[more]

Okadaiidae

[more]

Olcostephanidae

[more]

Oleacinidae

Oleacinidae is a taxonomic family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the clade Eupulmonata (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Olivellidae

[more]

Olividae

Olive snails, also known as olive shells and olives, scientific nameOlividae, are a taxonomic family of medium to large predatory sea snails with smooth, shiny, elongated oval-shaped shells. The shells often show various muted but attractive colors, and may be patterned also. They are marine gastropod molluscs in the family Olividae within the main clade Neogastropoda. [more]

Omalaxidae

[more]

Omalogyridae

Omalogyridae are a family of minute and microscopic sea snails, marine gastropod molluscs or micromolluscs in the informal group Lower Heterobranchia. [more]

Ommastrephidae

Ommastrephidae is a family of squid. It contains 3 subfamilies, 11 genera, and over 20 species. They are widely distributed globally and are extensively fished for food. One species, Todarodes pacificus, comprises around half of the world's cephalopod catch annually. [more]

Omniglyptidae

[more]

Omphalocirridae

[more]

Omphalotrochidae

[more]

Onchidiidae

Onchidiidae are a family of small, air-breathing sea (and land) slugs. They are shell-less marine (except of 5 species) pulmonate gastropod molluscs. Onchidiidae is the only family within the superfamily Onchidioidea. [more]

Onchidorididae

Onchidorididae are a taxonomic family of sea slugs, dorid nudibranchs, marine gastropod molluscs in the superfamily Onchidoridoidea. [more]

Oncoceratidae

Oncoceratidae, a family in the Oncocerida established by Hyatt, 1884, which is characterized by generally compressed, cyrtoconic and breviconic shells with an exogastric curvature such that the ventral profile is convex or more so than dorsal, and in which the siphucle is generally empty and located ventral of the center. In primitive forms the siphuncle in early growth stages is composed of tubular segments with almost straight, suborthochoanitic septal necks but becomes cyrtochoanitic with expanded segments in the later growth stages, and is expanded and cyrtochoanitic throughout in advanced forms. In a few advanced forms the siphuncle is actinosiphonate (Flower 1950, Sweet 1964) [more]

Onychochilidae

[more]

Onychoteuthidae

The family Onychoteuthidae (Hooked squid) currently comprises approximately 20?25 species (several known from only single life stages and thus unconfirmed), in 6 or 7 genera. They range in mature mantle length from 7 cm to a suggested length of 2 m for the largest member, the Robust Clubhook Squid (Onykia robusta). The family is characterised by the presence of hooks only on the tentacular clubs, a simple straight funnel?mantle locking apparatus, and a 'step' inside the jaw angle of the lower beak. With the exception of the Arctic Ocean, the family is found worldwide. [more]

Oopeltidae

Ophiceratidae

[more]

Ophidioceratidae

[more]

Ophiletidae

[more]

Opisthonematidae

[more]

Opisthoteuthidae

Umbrella octopuses (family Opisthoteuthidae) are a group of pelagic octopuses. [more]

Oppeliidae

Oppeliidae are compressed to oxyconic, sculptured Haplocerataceae, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great variety, but ribbing usually more or less falcoid or falcate. The Oppeliidae is the principal family of the Haplocerataceae, with the longest durantion, extending from the Middle Jurassic (Bajocian) to the Upper Cretaceous (Cenomanian) Their derivation is from the Hildocerataceae. [more]

Orbitestellidae

Orbitestellidae are a family of minute sea snails, marine gastropod molluscs or micromolluscs in the informal group Lower Heterobranchia. [more]

Orculidae

Orculidae is a family of mostly minute, air-breathing, land snails; terrestrial pulmonate gastropod mollusks in the order Pulmonata. [more]

Oreohelicidae

Oreohelicidae is a family of small to medium-sized air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Punctoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Oriostomatidae

[more]

Ormoceratidae

[more]

Orthalicidae

Orthalicidae (orthalicid land snails) are a family of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks are classified in the informal group Sigmurethra of the clade Stylommatophora. They are medium-sized to large snails, from about 3 cm (about 1.2 inches) to 9 cm (about 3.5 inches) in shell length. [more]

Orthoceratidae

Orthoceratidae, is an extinct family of actively mobile carnivorous cephalapods, subclass Nautiloidea, that lived in what would be North America, Europe, Asia, Africa, and Australia from the Ordovician through Triassic from 490?203.7 mya, existing for approximately 286.4 million years. [more]

Orthonotidae

[more]

Orthonychiidae

?Orthonychiidae is an extinct taxonomic family of fossil sea snails, marine, gastropod mollusks in the clade Cyrtoneritimorpha. [more]

Orulganitidae

[more]

Osteopeltidae

[more]

Ostreidae

Ostreidae are the true oysters, and include most species that are commonly eaten under the name oyster. Pearl oysters are not true oysters and belong to the distinct order Pterioida. [more]

Otinidae

Otina ovata is a species of small, air-breathing sea snail or sea slug, a marine pulmonate gastropod mollusk in the superfamily Otinoidea. [more]

Otoceratidae

[more]

Otoconchidae

[more]

Otoitidae

[more]

Ovulidae

Ovulidae, common names the ovulids, cowry allies or false cowries, is a family of small to large predatory or parasitic sea snails, marine gastropod molluscs in the superfamily Cypraeoidea, the cowries and the cowry allies. [more]

Oxychilidae

[more]

Oxynoidae

Oxynoidae is a family of sea snails, bubble snails, marine gastropod mollusks in the superfamily Oxynooidea, an opisthobranch group. [more]

Oxynoticeratidae

Oxynoticeratidae is a family of true ammonites (order Ammonitida) from the Lower Jurassic. They are part of the superfamily Psilocerataceae, characterized by mostly involute, oxyconic shells with narrow venter and compressed, lanceolate whorl section. Suture is ammonitic. Ribbing is feeble, hardly functional and often absent. [more]

Oxyteuthididae

[more]

Oxytomidae

[more]

Pachyceratidae

[more]

Pachychilidae

Pachychilidae, common name pachychilids, is a taxonomic family of freshwater snails, gastropod molluscs in the clade Sorbeoconcha. [more]

Pachydiscidae

[more]

Paedophoropodidae

[more]

Paladmetidae

[more]

Palaeacmaeidae

[more]

Palaeobelemnopseidae

[more]

Palaeoctopodidae

[more]

Palaeololiginidae

[more]

Palaeomutelidae

[more]

Palaeorissoinidae

[more]

Palaeostoidae

[more]

Palaeostylidae

[more]

Palaeotrochidae

[more]

Palaeozygopleuridae

[more]

Palliohedylidae

[more]

Paludomidae

[more]

Pandoridae

Pandoridae is a family of marine bivalves of the Pholadomyoida order. [more]

Papillodermatidae

[more]

Papillodermidae

Papilloderma altonagai is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the informal group Sigmurethra. [more]

Paraceltitidae

[more]

Paracenoceratidae

[more]

Paragastrioceratidae

[more]

Parahoplitidae

[more]

Parallelodontidae

The Parallelodontidae is a family of bivalves, related to the ark clams. It contains at least four genera. [more]

Paranannitidae

[more]

Paranoritidae

[more]

Pararrhopaliidae

[more]

Paraturbinidae

[more]

Parawocklumeriidae

[more]

Pareoridae

[more]

Parhedylidae

[more]

Parkinsoniidae

[more]

Parmacellidae

Parmacellidae is a family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks within the superfamily Parmacelloidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Parodoceratidae

[more]

Partulidae

Partulidae is a family of air-breathing land snails, terrestrial gastropod mollusks in the superfamily Partuloidea. The family is endemic to Pacific islands. [more]

Paryphantidae

[more]

Passaloteuthididae

[more]

Patelliconidae

[more]

Patellidae

Patellidae is a taxonomic family of sea snails or true limpets, marine gastropod molluscs in the clade Patellogastropoda. [more]

Patelloplanorbidae

[more]

Patulidae

[more]

Pavlodiscidae

[more]

Pectinidae

The Pectinidae (from Latin pecten meaning comb), common name "scallops", are a family of saltwater bivalve mollusks. They are hermaphrodite, and the male gonads mature first. There are numerous species of various sizes in all of the oceans, and a number species are of commercial importance. Some pectinidae live attached by means of a filament they secrete, others are simply recumbent, but a form of jet-propulsion created by repeatedly clapping their valves closed can propel them swiftly but erratically through the water when they sense the presence of a predator such as a starfish. [more]

Pelagiellidae

[more]

Peltospiridae

Peltospiridae is a small family of gastropods in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Pelycidiidae

[more]

Pendromidae

[more]

Peraclidae

[more]

Peraclididae

Cymbulioidea is a taxonomic superfamily of pelagic "sea butterflies". These are holoplanktonic opisthobranch molluscs in the clade Thecosomata. [more]

Pergamidiidae

[more]

Pericyclidae

[more]

Perimeniidae

[more]

Periplomatidae

Periplomatidae is a family of large marine bivalves of the Pholadomyoida order. [more]

Perisphinctidae

[more]

Perissityidae

[more]

Perrinitidae

[more]

Personidae

Personidae is a family of sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Perunelidae

[more]

Petricolidae

The Petricolidae is a family of bivalves related to the large family Veneridae or Venus clams. Some authors include these genera within the Veneridae as the subfamily Petricolinae. [more]

Phanerotrematidae

[more]

Pharidae

Pharidae is a family of bivalve molluscs, and is in the unassigned . This family of clams related to the razor shells (Solenidae), a family which includes Pharidae by some authorities. [more]

Phasianellidae

[more]

Phenacolepadidae

Phenacolepadidae is a family of small sea snails or false limpets, marine gastropod mollusks in the clade Cycloneritimorpha (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Philinidae

Philinidae is a family of medium-sized, sea slugs, marine opisthobranch gastropod mollusks. They are headshield slugs, in the Cephalaspidea. [more]

Philinoglossidae

Philinoglossidae is a family of marine snails, gastropod mollusks in the superfamily Philinoidea. [more]

Philobryidae

Philobryidae is a family of bivalves, related to the ark clams and bittersweets. Species are found in most seas, in shallow to moderately deep water. This family contains about sixty species in seven genera. [more]

Philomycidae

Philomycidae are a family of air-breathing land slugs (snails without shells or with only shell remnants). They are terrestrial pulmonate gastropod mollusks in the superfamily Arionoidea (according taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Phlycticrioceratidae

[more]

Pholadidae

Pholadidae, known as piddocks or angelwings, are a family of bivalve mollusc similar to a clam; however, they are unique in that each side of their shells is divided into 2 or 3 separate sections. Furthermore, one of the piddock's shells has a set of ridges or "teeth", which they use to grind away at clay or soft rock and create tubular burrows. The shape of these burrows is due to the rotating motion of the piddock as it grinds the rock to make its home. The piddock stays in the burrow it digs for the entirety of its eight year lifespan, with only its siphon exposed to take in water that it filters for food. When the piddock dies and leaves an empty tubular burrow, other marine life such as sea anemone, crabs and other molluscs may use the burrow. [more]

Pholadomyidae

Pholadomyidae is a family of marine bivalves of the Pholadomyoida order - 2.5 in long by 1 in high. [more]

Pholidoteuthidae

Pholidoteuthis is a genus of squid in the monotypic family Pholidoteuthidae, comprising at least two species. The defunct genus Tetronychoteuthis was previously incorporated into Pholidoteuthidae based upon a singular taxon known as Tetronychoteuthis massyae. Following the discovery of Pholidoteuthis boschmai in 1950, T. massaye was placed into Pholidoteuthis, with Tetronoychoteuthis considered a nomen dubium. P. boschmai is now considered a junior synonym of . [more]

Pholidotomidae

[more]

Phragmoceratidae

[more]

Phragmoteuthididae

[more]

Phricodoceratidae

[more]

Phyllidiidae

Phyllidiidae is a family of sea slugs, dorid nudibranchs, marine gastropod mollusks in the superfamily Phyllidioidea. [more]

Phylliroidae

Phylliroidae are a taxonomic family of nudibranchs, marine gastropod molluscs in the order Opisthobranchia. [more]

Phylloceratidae

Phylloceratidae is the predominant family of the Phylloceratina with some 15 or more genera found in rocks ranging from the Lower Jurassic to the Upper Cretaceous. Members of the Phylloceratidae are characterized by smooth, involute shells with very thin walls. Many are covered with fine growth lines but are usually without ribbing. Sutures are complex with the major and minor branches of the saddles with phylloid or spatulate endings. [more]

Phyllomeniidae

[more]

Phylobryidae

[more]

Phymatoceratidae

[more]

Phymatopleuridae

[more]

Physidae

Physidae, common name bladder snails, are a monophyletic taxonomic family of small freshwater snails, aquatic pulmonate gastropod molluscs in the clade Hygrophila. [more]

Pickworthiidae

Pickworthiidae is a family of sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Pileolidae

[more]

Piloceratidae

[more]

Pinacitidae

[more]

Pinacoceratidae

[more]

Pinnidae

Pinnidae is a family of large saltwater clams sometimes known as pen shells. They are marine bivalve molluscs in the order Pterioida. [more]

Pinufiidae

[more]

Pisanianuridae

[more]

Piseinotecidae

[more]

Pisidiidae

Pisidiidae is a family of clams. [more]

Pithodeidae

[more]

Placenticeratidae

[more]

Placobranchidae

[more]

Placostylidae

[more]

Placunidae

[more]

Plagioptychidae

[more]

Plagiothyridae

[more]

Planaxidae

Planaxidae, common name planaxids, are a taxonomic family of small and minute sea snails, pantropical marine gastropod molluscs in the clade Sorbeoconcha. [more]

Planitrochidae

[more]

Planorbidae

Planorbidae, common name the ramshorn snails or ram's horn snails, is a family of air-breathing freshwater snails, aquatic pulmonate gastropod mollusks. [more]

Planorbioidea

[more]

Platyceratidae

Platyceratidae is an extinct family of Paleozoic gastropods of uncertain position in the clade Neritimorpha (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). Platyceras and other platyceratid gastropods are known for the complex symbiotic relationships they had with crinoids. [more]

Platyclymeniidae

[more]

Platydorididae

Discodorididae is a taxonomic family of sea slugs, specifically dorid nudibranchs, marine gastropod mollusks in the superfamily Doridoidea. [more]

Platyhedylidae

[more]

Plectopylidae

[more]

Pleioptygmatidae

[more]

Plesioteuthididae

[more]

Plesiotrochidae

[more]

Plethospiridae

[more]

Pleurobranchidae

The Pleurobranchidae are a taxonomic family of sea slugs, marine gastropod molluscs in the order Notaspidea. [more]

Pleuroceridae

Pleuroceridae, common name pleurocerids, is a family of small to medium-sized freshwater snails, aquatic gilled gastropod mollusks in the superfamily Cerithioidea.These snails have an operculum and typically a robust high-spired shell. [more]

Pleurodiscidae

Pleurodiscus is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Pupilloidea. [more]

Pleurodontidae

[more]

Pleurolidiidae

[more]

Pleuromyidae

[more]

Pleurotomariidae

Pleurotomariidae, common name the '"slit snails", is a family of large marine gastropods in the clade Vetigastropoda. This family is very ancient; there were numerous species in the geological past. It is currently represented by a group of species that live only in deep water. This family has no subfamilies. [more]

Pleurotomidae

[more]

Plicatulidae

[more]

Plicatusidae

[more]

Pliopholygidae

[more]

Plusculidae

[more]

Pneumodermatidae

Pneumodermatidae is a family of sea angels, or small floating predatory sea snails or sea slugs. They are pelagic marine heterobranch opisthobranch gastropod mollusks in the clade Gymnosomata. [more]

Polyceratidae

Polyceridae is a taxonomic family of sea slugs, dorid nudibranchs, marine gastropod mollusks within the Superfamily Polyceroidea. [more]

Polyceridae

Polyceridae is a taxonomic family of sea slugs, dorid nudibranchs, marine gastropod mollusks within the Superfamily Polyceroidea. [more]

Polygyridae

Polygyridae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea. [more]

Polygyrinidae

[more]

Polygyrynidae

[more]

Polymorphitidae

[more]

Polytremariidae

[more]

Pomatiasidae

[more]

Pomatiidae

[more]

Pomatiopsidae

Pomatiopsidae is a family of small mainly freshwater snails (but also in other habitats) with gills and an operculum, aquatic gastropod mollusks in the superfamily Rissooidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Pommerozygiidae

[more]

Popanoceratidae

[more]

Popenellidae

[more]

Porcelliidae

[more]

Poromyidae

Poromyidae is a family of marine bivalves of the order Pholadomyoida. The genus Dilemma, described only in 2008, is remarkable for being a predator of copepods, unusual for sessile molluscs. [more]

Portlockiellidae

[more]

Posidoniidae

[more]

Posttornoceratidae

[more]

Potamididae

Potamididae, common name potamidids (also horn snails or mudwhelks), are a family of small to large brackish water snails living in mangroves, gastropod molluscs of the clade Sorbeoconcha. Traditionally, potamidids and batillariids have been confused with each other for having similar shells and living in a similar environment. For many fossil taxa the family assignment to either of these two families is still unresolved or controversial. [more]

Poteridae

[more]

Poteriidae

Neocyclotidae is a family of tropical land snails with gills and an operculum, terrestrial gastropod mollusks in the informal group Architaenioglossa belonging to the clade Caenogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Poterioceratidae

[more]

Praecardiidae

[more]

Praenuculidae

[more]

Pragoscutulidae

[more]

Pragoserpulinidae

[more]

Prionitidae

[more]

Prionoceratidae

Prionoceratidae is one of seven families of the Prionocerataceae families, a member of the Goniatitida order. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids. [more]

Prisciphoridae

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Pristiglomidae

Pristiglomidae is a family of clams of the order Nuculoida. [more]

Pristilomatidae

[more]

Procarinariidae

[more]

Procerithiidae

[more]

Prochaetodermatidae

The Prochaetodermatidae are a family of small worm-shaped (<1 cm) chaetoderm molluscs. The burrowing organisms lack a true foot; they have a large pair of jaws and a small radula, comprising a dozen rows of paired teeth. They are known from across the globe, except in polar regions, and inhabit ocean depts of 50 m to the deepest depths trawled. [more]

Proconulidae

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Proctonotidae

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Prodromitidae

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Prolecanitidae

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Prolobitidae

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Promachoteuthidae

Promachoteuthis is a genus of small, weakly muscled squid found at bathypelagic depths. Three species have been formally described, while another two await description. [more]

Proneomeniidae

Proneomeniidae is a family of uncommon molluscs in the class Aplacophora. [more]

Pronoritidae

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Propeamussidae

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Propeamussiidae

Propeamussiidae is a family of bivalves, related to oysters and scallops. It contains nine genera. [more]

Propinacoceratidae

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Proplinidae

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Proptychitidae

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Propupaspiridae

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Proserpinellidae

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Proserpinidae

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Prosphingitidae

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Prospondylidae

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Prospondylidea

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Prostyliferidae

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Proterocameroceratidae

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Protoconchoididae

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Protoculidae

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Protorculidae

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Provalvatidae

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Provannidae

Provannidae is a family of deep water sea snails, marine gastropod mollusks in the clade Caenogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Psammobiidae

Psammobiidae or sunset clams, are a family of medium-sized saltwater clams, marine bivalve molluscs of the order Veneroida. [more]

Pseudobigaleaidae

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Pseudoclymeniidae

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Pseudococculinidae

Pseudococculinidae is a family of gastropods in the clade Vetigastropoda (according taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Pseudohaloritidae

[more]

Pseudolividae

Pseudolividae is a taxonomic family sea snails, marine gastropod mollusks. [more]

Pseudomelaniidae

Pseudomelaniidae is an extinct family of fossil sea snails, marine gastropod mollusks in the clade Caenogastropoda. [more]

Pseudomelatomidae

Pseudomelatomidae is a family of predatory sea snails, marine gastropods included in the superfamily Conoidea (previously Conacea) and part of the Neogastropoda (Bouchet & Rocroi, 2005). [more]

Pseudomonotidae

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Pseudoparalegoceratidae

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Pseudophoridae

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Pseudorthoceratidae

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Pseudorthonychiidae

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Pseudosacculidae

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Pseudovermidae

Pseudovermidae is a taxonomic family of minute sea slug[ ]s, specifically aolid nudibranchs, marine gastropod mollusk or micromollusks. [more]

Pseudozygopleuridae

Pseudozygopleuridae is an extinct family of fossil sea snails, marine gastropod mollusks in the clade Caenogastropoda. [more]

Pseudunelidae

[more]

Psiloceratidae

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Psychroteuthidae

The Glacial Squid (Psychroteuthis glacialis) is the only known species in the monotypic genus Psychroteuthis, in the family Psychroteuthidae. While only one species has been confirmed, it is possible that two undescribed species also exist. The species occurs in coastal waters near Antarctica and South America. It grows to a mantle length of 44 cm. [more]

Pteriidae

Pteriidae is a family of medium-sized to large saltwater clams. They are pearl oysters, marine bivalve mollusks in the order Pterioida. [more]

Pterineidae

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Pterinopectinidae

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Pterothecidae

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Pterotracheidae

Pterotracheidae is a family of medium-sized to large floating sea snails, pelagic gastropod molluscs. They are in the superfamily Pterotracheoidea along with two other similar pelagic families, the Atlantidae and the Carinariidae. [more]

Ptychatractidae

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Ptychitidae

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Ptychoceratidae

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Pugnellidae

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Pulchelliidae

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Pulsellidae

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Pulvinitidae

Pulvinitidae is a family of bivalves related to the scallops and oysters. [more]

Punctidae

Punctidae, common name the "dot snails", is a family of minute air-breathing land snails, terrestrial pulmonate gastropod mollusks or micromollusks in the informal group Sigmurethra (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Pupillidae

Pupillidae is a family of mostly minute, air-breathing, land snails, terrestrial pulmonate gastropod mollusks or micromollusks in the clade Stylommatophora. [more]

Pupinidae

Pupinidae is a taxonomic family of land snails with an operculum, terrestrial gastropod mollusks in the superfamily Cyclophoroidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Purpurinidae

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Pyramidellidae

Pyramidellidae, common name the pyram family, or pyramid shells, is a voluminous taxonomic family of mostly small and minute ectoparasitic sea snails, marine heterobranch gastropod molluscs or micromolluscs. [more]

Pyramidulidae

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Pyrgulidae

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Pyropeltidae

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Pyroteuthidae

Fire squid are species belonging to the family Pyroteuthidae. The family comprises two genera. Species are diurnally mesopelagic, however migrate into surface waters during the night. The family is characterised by the tentacles, which have a permanent constriction and bend near the base; and photophores occurring on the tentacles, eyeballs and viscera. Members reach mantle lengths of 23-50 mm. Paralavae of the family are common around the Hawaiian Islands, with up to 17% of collected specimens in the area belonging to Pyroteuthidae. [more]

Quenstedtiidae

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Radiolitidae

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Raetomyidae

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Ramositidae

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Ranellidae

Ranellidae, common name the triton shells or tritons, is a taxonomic family of small to very large predatory sea snails, marine gastropod mollusks in the clade Littorinimorpha. [more]

Raphistomatidae

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Rastodentidae

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Rathouisiidae

Rathouisiidae is a family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks. [more]

Reineckiidae

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Requieniidae

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Reticuloceratidae

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Retusidae

Retusidae is a family of small sea snails, marine opisthobranch gastropod mollusks. They are headshield slugs, in the clade Cephalaspidea. [more]

Rhabdidae

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Rhaphischismatidae

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Rhipidoherpiidae

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Rhodopidae

Rhodopidae is a taxonomic family of dorid nudibranch, shell-less marine gastropod mollusks. [more]

Rhopalomeniidae

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Rhymmoceratidae

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Rhytididae

Rhytididae is a taxonomic family of medium-sized predatory air-breathing land snails, carnivorous terrestrial pulmonate gastropod molluscs in the superfamily Rhytidoidea. [more]

Rhytidopilidae

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Ribeiriidae

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Ringiculidae

Ringiculidae are a family of minute deep water sea snails or micromolluscs, marine gastropod mollusks or micromollusks in the informal group Lower Heterobranchia. [more]

Rissoellidae

Rissoellidae are a family of minute sea snails, marine gastropod molluscs in the informal group Lower Heterobranchia. [more]

Rissoidae

Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the clade Littorinimorpha. [more]

Robustidae

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Rostangidae

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Runcinidae

Runcinidae is a family of medium-sized, sea slugs, marine opisthobranch gastropod mollusks. They are headshield slugs, in the clade Cephalaspidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Rutoceratidae

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Sagdidae

Sagdidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks with highest diversity in the Greater Antilles. It has been classified in its own superfamily Sagdoidea and as a member of the superfamily Helicoidea. Some species of Sagdidae are ovoviviparous. [more]

Sageceratidae

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Salpingoteuthididae

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Sandalomeniidae

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Sarganidae

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Scalaris

Scaliolidae

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Scaphandridae

Scaphandridae is a family of sea snails, marine gastropod mollusks in the superfamily ???.[] [more]

Scaphitidae

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Scenellidae

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Schistoceratidae

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Schizochitonidae

Schizochitonidae is an extinct[] family of polyplacophoran mollusc. [more]

Schizogoniidae

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Schloenbachiidae

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Schlotheimiidae

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Scissurellidae

Scissurellidae, sometimes known by the common name little slit snails, are a taxonomic family of minute sea snails, marine gastropod molluscs or micromolluscs in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Scoliostomatidae

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Scolodontidae

Sculptariidae

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Scutopidae

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Scyllaeidae

Scyllaeidae is a family of sea slugs, nudibranchs, marine gastropod mollusks in the superfamily Tritonioidea. [more]

Seguenziidae

Seguenziidae is a family of extremely small deepwater sea snails, marine gastropod mollusks in the superfamily Seguenzioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Semelidae

The Semelidae are a family of clams, marine bivalve molluscs of the order Veneroida. [more]

Sepiadariidae

Sepiadariidae is a family of cephalopods in the order Sepiida. [more]

Sepiidae

Sepiidae is a family of cephalopods in the order Sepiida. [more]

Sepiolidae

Sepiolidae is a family of bobtail squid encompassing 15 genera in three or four subfamilies. [more]

Seraphsidae

[more]

Settsassiidae

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Shelbyoceridae

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Shumarditidae

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Sibiritidae

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Siliculidae

Siliculidae is a family of marine bivalve mollusks, small deepwater clams which are classified in the order Nuculanoida. [more]

Siliquariidae

Siliquariidae is a family of sea snails with unusual, very loosely coiled shells. These are marine gastropod molluscs in the clade Sorbeoconcha. [more]

Simoceratidae

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Simrothiellidae

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Sinuitidae

Sinuitidae is an extinct family of paleozoic molluscs of uncertain position (Gastropoda or Monoplacophora) with isostrophically coiled shells. [more]

Sinuopeidae

Sinuopeidae is an extinct family of paleozoic gastropod mollusks. [more]

Siphonariidae

Siphonariidae is a taxonomic family of small to medium-sized air-breathing sea snails, marine and brackish water pulmonate gastropod molluscs. These snails are sometimes known as "false limpets" because of the shape of the shell, but they are not at all closely related to true limpets. They breathe with a lung, not with gills, and are more closely related to freshwater air-breathing snails such as Lymnaea. [more]

Skeneidae

Turbinidae, the turban snails, are a family of small to large marine gastropods. Turbinidae have a strong, thick calcareous operculum readily distinguishing them from the somewhat similar Trochidae or top snails, which have a corneous operculum. This strong operculum serves as a passive defensive structure against predators that try to enter by way of the aperture or that would break the shell at the outer lip. [more]

Skeneopsidae

Skeneopsidae is a family of very small sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Smaragdinellidae

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Smeagolidae

Smeagol is a genus of small air-breathing sea slugs of the upper intertidal zone, pulmonate gastropod mollusks in the superfamily Otinoidea. [more]

Sobolewiidae

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Solariellidae

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Solecurtidae

Solecurtidae is a family of saltwater clams, marine bivalve mollusks in the order Veneroida. [more]

Solemyidae

Solemyidae is a family of protobranch bivalves in the order Solemyoida. . Solemyids are remarkable in that their digestive tract is either extremely small or non-existent, and their feeding appendages are too short to reach outside the shell . It has been shown that these clams host sulphur-oxidizing Bacteria intracellularly within their gill filaments. As chemoautotrophs, these bacterial symbionts synthesize organic matter from CO2 and are the primary source of nutrition for the whole organism . In turn, the animal host provides its symbionts a habitat in which they have access to the substrates of chemoautotrophy (O2, CO2, and reduced inorganic compounds such as H2S). Together, these partners create "animals" with novel metabolic capabilities. [more]

Solenidae

Solenidae is a family of saltwater clams known as razor shells, marine bivalve mollusks and is in the unassigned . [more]

Soleniscidae

Soleniscidae is an extinct family of fossil sea snails, marine gastropod mollusks in the clade Caenogastropoda. [more]

Solenochilidae

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Somoholitidae

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Sonninidae

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Sonniniidae

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Sowerbyidae

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Spanionematidae

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Speightiidae

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Spelaeoconchidae

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Spelaeodiscidae

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Sphaeriidae

The Sphaeriidae are a family of small to minute freshwater bivalve molluscs, in the order Veneroida. In the USA they are commonly known as the pea clams and the fingernail clams. [more]

Sphaeroceratidae

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Sphaerocinidae

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Sphaerodomidae

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Spheniopsidae

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Sphenodiscidae

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Sphincterochilidae

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Spinulidae

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Spiraxidae

Spiraxidae is a family of air-breathing land snails, terrestrial pulmonate gastropods in the clade Eupulmonata (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Spiroceratidae

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Spirolegoceratidae

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Spirostylidae

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Spirulidae

Spirula spirula is a species of deepwater squid-like cephalopod mollusk. It is the only extant member of the genus Spirula, the family Spirulidae, and the order Spirulida. It is commonly known as the ram's horn squid, little post horn squid or tail-light squid. [more]

Spirulirostridae

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Spirulirostrinidae

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Spondylidae

Spondylus is a genus of bivalve molluscs, the only genus in the family Spondylidae. As well as being the systematic or scientific name, Spondylus is also the most often used common name for these animals, though they are also known as thorny oysters or spiny oysters. [more]

Sporadoceratidae

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Sportellidae

Sportellidae is a family of marine bivalve molluscs of the order Veneroida. [more]

Staffordiidae

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Stauroteuthidae

Stauroteuthis is a genus of deepwater octopus, a cephalopod mollusk. This is the only genus in the family Stauroteuthidae, and only two species have been described in this genus. [more]

Steinmannitidae

[more]

Stenolaphyritidae

Stenolaphyritidae is one of six families of the Somoholitaceae superfamilia. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids. [more]

Stenothecidae

Stenothecidae is an extinct family of univalved Cambrian molluscs. (Do not confuse with Cambrian problematic invertebrates with bivalved (dorsal and ventral) shell, members of the class Stenothecoida). [more]

Stenothyridae

Stenothyridae is a family of freshwater snails, snails with gills and an operculum, aquatic gastropod mollusks in the superfamily Rissooidea. [more]

Stephanitidae

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Stephanoceratidae

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Stiliferidae

Eulimidae is a family of very small parasitic sea snails, marine gastropod mollusks in the superfamily Eulimoidea. [more]

Stiligeridae

Limapontiidae is a taxonomic family of small to minute sacoglossan sea slugs. These are marine opisthobranch gastropod mollusks. [more]

Stomatellidae

Stomatellidae is a family of small marine gastropods now included in the Vetigastropoda. [more]

Straparollinidae

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Streblochondriidae

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Strepsiduridae

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Streptacididae

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Streptaxidae

Streptaxidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the Stylommatophora. Six Streptaxidae subfamilies are accepted in the 2005 taxonomy of the Gastropoda by Bouchet & Rocroi. [more]

Strictispiridae

Strictispiridae is a taxonomic family sea snails, marine gastropod mollusks. [more]

Strigoceratidae

[more]

Strobilopsidae

Strobilopsidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Pupilloidea. [more]

Strombidae

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Strophocheilidae

Strophocheilidae is a taxonomic family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Acavoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Strophomeniidae

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Strubelliidae

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Struthiolariidae

"Ostrich foot" redirects here. For the foot of an ostrich, see here. [more]

Stuoraxidae

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Styliolinidae

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Subulinidae

Subulinidae is a family of small tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Achatinoidea. [more]

Subulitidae

[more]

Succineidae

Succineidae are a family of small to medium-sized, air-breathing, land snails (and slugs), terrestrial pulmonate gastropod molluscs. They are commonly called amber snails because their thin fragile shells are translucent and amber-colored. They usually live in damp habitats such as marshes. [more]

Sudeticeratidae

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Sueviteuthididae

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Surenitidae

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Sutilizonidae

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Symmetrocapulidae

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Syncyclonemidae

Entoliidae is a family of bivalves that are related to oysters and scallops. The family contains at least seven species in five different genera. [more]

Syngenoherpiidae

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Syringonautilidae

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Syrnolopsidae

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Tainoceratidae

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Taiomidae

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Tancrediidae

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Tantulidae

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Tapashanitidae

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Tarphyceratidae

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Technophoridae

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Teicherticeratidae

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Tellinidae

Tellinidae is a family of marine bivalve molluscs of the order Veneroida. They live fairly deep in soft sediments in shallow seas and respire using long siphons that reach up to the surface of the sediment. [more]

Temnotropidae

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Tentaculitidae

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Terebrellidae

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Terebridae

The Terebridae, commonly referred to as auger shells or auger snails, are a group or taxonomic family of small to large predatory sea snails, marine gastropod mollusks. [more]

Teredinidae

Shipworms are not worms at all, but rather a group of unusual saltwater clams with very small shells, notorious for boring into (and eventually destroying) wooden structures that are immersed in sea water, such as piers, docks and wooden ships. Sometimes called "termites of the sea", they are marine bivalve molluscs (Eulamellibranchiata) in the family Teredinidae, also often known as Teredo worms. [more]

Tergipedidae

Tergipedidae is a family of seaslugs, aeolid nudibranchs, marine gastropod mollusks in the clade Nudibranchia (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Terquemiidae

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Testacellidae

Testacella is genus of small to medium-large, predatory, air-breathing, land slugs. They are terrestrial gastropod mollusks in the family Testacellidae, the shelled slugs. They are not often seen because they live underground. [more]

Tethydidae

Tethydidae is a family of sea slugs, marine gastropod mollusks in the superfamily Tritonioidea. [more]

Tetragonitidae

[more]

Thalassoceratidae

Thalassoceratidae is one of two families of the Goniatitina suborder. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids. [more]

Thersiteidae

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Thetiditidae

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Thiaridae

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Thisbitidae

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Thliptodontidae

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Thoraliidae

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Thraciidae

Thraciidae is a family of marine bivalves of the Pholadomyoida order. [more]

Thyasiridae

Thyasiridae is a family of bivalve molluscs, including the cleft clams. [more]

Thycidae

[more]

Thyrophorellidae

Thyrophorellidae is a family of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Punctoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Thysanophoridae

Thysanophoridae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Thysanoteuthidae

Thysanoteuthis is a genus of large squid comprising one well known species, the Diamond Squid, and two dubious taxa. [more]

Tibetitidae

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Tindariidae

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Tirolitidae

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Titiscaniidae

Titiscania is a genus of marine gastropods in the superfamily Neritopsoidea. [more]

Tjaernoeiidae

[more]

Tofanellidae

[more]

Tonicellidae

[more]

Tonnidae

Tonnidae is a family of medium-sized to very large sea snails, known as the tun shells. These are marine gastropod molluscs in the clade Sorbeoconcha and the clade Littorinimorpha. [more]

Tornidae

Tornidae is a family of very small and minute sea snails with an operculum, marine gastropod mollusks in the clade Littorinimorpha. This family used to be known as the Vitrinellidae. [more]

Tornoceratidae

Tornoceratidae is a family of goniatitid ammonoinds from the middle and upper Devonian The family is included in the suborder Tornoceratina and the superfamily Tornoceratoidea. [more]

Trachoecidae

[more]

Trachyceratidae

The Trachyceratidae is a family of ceratitid ammonoid cephalopods that lived during the Middle- and Late Triassic characterized by shells that are more or less involute and highly ornamented. [more]

Trachysmatidae

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Trachyteuthididae

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Trajanellidae

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Trapezidae

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Trapeziidae

Trapeziidae is a family of crabs. All the species in the family are found in a close symbiosis with cnidarians. They are found across the Indo-Pacific, and can best be identified to the species level by the color patterns they display. Members of the family were previously included in the Trapeziidae, but the similarities between the taxa is the result of convergent evolution. [more]

Tremanotidae

[more]

Tremoctopodidae

Tremoctopus is a genus of pelagic cephalopods, containing four species that occupy surface to mid-waters in subtropical and tropical oceans. They are commonly known as blanket octopuses, in reference to the long transparent webs that connect the dorsal and dorsolateral arms of the adult females. The other arms are much shorter and lack webbing. [more]

Trenellidae

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Trichotropidae

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Tricoliidae

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Tridacnidae

The Tridacninae are a subfamily of Bivalves colloquially known as giant clams. The family contains the biggest bivalve species, including Tridacna gigas, the giant clam. They have heavy shells, fluted with 4?6 folds. Mantle is usually brightly colored. They inhabit coral reefs in warm seas of the Indo-Pacific region. In some areas, such as the Philippines, members of the family are farmed for the marine aquarium trade. Most of them live in symbiosis with photosynthetic dinoflagellates (zooxanthellae). [more]

Triforidae

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Trigoniidae

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Trigonoceratidae

[more]

Trigonochlamydidae

Trigonodidae

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Trimeroceratidae

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Trimusculidae

Trimusculus is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs. [more]

Triophidae

[more]

Tripartellidae

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Triphoridae

Triphoridae are a family of very small sea snails, marine gastropod molluscs in the informal group Ptenoglossa in the clade Hypsogastropoda. Almost all the species in this family are micromollusks. [more]

Tripteroceratidae

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Trissexodontidae

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Tritoniidae

Tritoniidae are a taxonomic family of dendronotid nudibranchs, marine gastropod molluscs. [more]

Triviidae

Triviidae is a taxonomic family of small sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Trochaclididae

Ataphridae, common name the false top snails, is a family of sea snails, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Trochidae

The Trochidae, common name top snails, are a taxonomic family of very small to large sea snails, marine gastropod molluscs in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi from 2005). [more]

Trocholitidae

[more]

Trochomorphidae

Trochomorphidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the clade Eupulmonata (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Trochonematidae

[more]

Trochotomidae

[more]

Tropiceltitidae

[more]

Tropidodiscidae

[more]

Tropitidae

[more]

Truncatellidae

Truncatellidae, common name the "looping snails", is a family of small amphibious snails, with gills and an operculum, semi-marine gastropod mollusks or micromollusks. [more]

Tryblidiidae

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Trypanaxidae

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Tubinidae

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Tudiclidae

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Tulitidae

[more]

Turbinellidae

Turbinellidae are a family of sea snails, marine gastropod mollusks in the order Neogastropoda. [more]

Turbinidae

Turbinidae, the turban snails, are a family of small to large marine gastropods. Turbinidae have a strong, thick calcareous operculum readily distinguishing them from the somewhat similar Trochidae or top snails, which have a corneous operculum. This strong operculum serves as a passive defensive structure against predators that try to enter by way of the aperture or that would break the shell at the outer lip. [more]

Turbiniidae

[more]

Turridae

Turridae, (common name, the turrids), is a large taxonomic family of predatory sea snails, marine gastropod mollusks, that vary in size from minute to moderately large. With more than 4,000 species, the Turridae (sensu Powell 1966) is the largest mollusk family and group of marine caenogastropods. There are about 27,000 described scientific names (accepted names and synonyms) within the family Turridae. They constitute more than half of the predatory species of gastropods in some parts of the world (Taylor et al. 1980). [more]

Turrilitidae

[more]

Turritellidae

Turritellidae, the tower snails, is a taxonomic family of small to medium-sized sea snails, marine gastropod molluscs in the clade Sorbeoconcha. [more]

Turrridae

[more]

Turtoniidae

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Tychobraheidae

Tychobraheidae is an extinct family of gastropods in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Tylodinidae

Tylodinidae is a family of sea snails or limpets, marine opisthobranch gastropod mollusks in the superfamily Umbraculoidea. [more]

Tylostomatidae

[more]

Umboniidae

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Umbraculidae

Umbraculidae are a taxonomic family of unusual sea snails or limpets, marine opistobranch gastropod molluscs in the clade Umbraculida. [more]

Uncertain Taxonomic Position

Ungulinidae

Ungulinidae is a family of marine bivalve molluscs. [more]

Unionidae

Unionidae is a family of freshwater mussels, the largest in the order Unionoida, the bivalve mollusks sometimes known as river mussels, naiads, or simply as unionids. [more]

Uranoceratidae

[more]

Urocoptidae

Urocoptidae is a family of land snails, gastropods in the superfamily Urocoptoidea. [more]

Urocyclidae

Urocyclidae is a family of air-breathing land snails and semi-slugs, terrestrial pulmonate gastropod mollusks in the superfamily Helicarionoidea, (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Ussuritidae

[more]

Valloniidae

Valloniidae is a taxonomic family of small and minute, air-breathing land snails, terrestrial pulmonate gastropod mollusks in the clade Stylommatophora. [more]

Valvatidae

Valvatidae, the valve snails, is a taxonomic family of very small freshwater snails with an operculum, aquatic gastropod mollusks. [more]

Vampyroteuthidae

Vampyroteuthidae is a family of vampyromorph cephalopods comprising the extant Vampire Squid, Vampyroteuthis infernalis, and the extinct Vampyronassa rhodanica from the Middle Jurassic. [more]

Vanikoridae

Vanikoridae is a family of very small or medium sized sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Vascoceratidae

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Vasidae

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Vasseuriidae

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Vayssiereidae

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Velainellidae

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Velutinidae

Velutinidae is a family of small sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Vemidae

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Veneridae

The Veneridae or venerids, common name the Venus clams, are a very large family of minute to large, saltwater clams, marine bivalve molluscs. There are over 500 living species of venerid bivalves, most of which are edible, and many of which are exploited as a food source. [more]

Vermetidae

Vermetidae, common name the worm snails or worm shells, is a taxonomic family of small to medium-sized sea snails, marine gastropod molluscs in the clade Littorinimorpha. [more]

Veronicellidae

The Veronicellidae, common name the leatherleaf slugs, are a terrestrial family of pulmonate slugs. [more]

Verticordiidae

Verticordiidae is a family of marine bivalves of the Pholadomyoida order. [more]

Vertiginidae

Vertiginidae is a family of minute, air-breathing land snails, terrestrial pulmonate gastropod molluscs or micromollusks in the superfamily Pupilloidea. [more]

Vesicomyidae

Vesicomyidae is a family of bivalves. Its genera, with some selected species, are: [more]

Vidrioceratidae

[more]

Virgatitidae

[more]

Vitreledonellidae

Vitreledonella richardi, also known as the Glass Octopus, is an incirrate octopus. It is the sole representative of the genus Vitreledonella and of the family Vitreledonellidae. [more]

Vitrinellidae

[more]

Vitrinidae

Vitrinidae is a family of small, air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Limacoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [more]

Viviparidae

Viviparidae, sometimes known as the river snails or mystery snails,[] are a family of large operculate freshwater snails, aquatic gastropod mollusks. [more]

Vltaviellidae

[more]

Volumitridae

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Volutidae

Volutidae, common name volutes, are a taxonomic family of predatory sea snails that range in size from 9 mm to over 500 mm, marine gastropod mollusks. Most of the species have no operculum. [more]

Volutomitridae

Volutomitridae is a family of sea snails, marine gastropod mollusks in the superfamily Muricoidea. [more]

Volvatellidae

Volvatellidae is a taxonomic family of sea snails, marine gastropod mollusks in the superfamily Oxynooidea. [more]

Wallowaconchidae

[more]

Walvisteuthidae

Walvisteuthis is a genus of squid consisting of a single species, Walvisteuthis virilis. It is found in the southern Atlantic Ocean. Walvis (the Dutch word for whale) refers to the Walvis Ridge in the South Atlantic; virilis (Latin for male) was chosen because only one, male, specimen was ever caught. [more]

Weeksiidae

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Welleritidae

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Werneroceratidae

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Wiedeyoceratidae

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Wocklumeriidae

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Xanthonychidae

Xanthonychidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea. [more]

Xenoceltitidae

Xenoceltitidae are evolute, generally ribbed, upper Lower Triassic Ceratitida with ceratitic or goniatitic sutures; formerly included in the Noritaceae but now placed in the Xenodiscaceae. [more]

Xenodiscidae

[more]

Xenophoridae

Xenophoridae, common name carrier shells, are a taxonomic family of medium-sized to large sea snails, marine gastropod mollusks in the clade Littorinimorpha. [more]

Xipheroceratidae

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Xiphoteuthididae

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Xylodisculidae

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Yochelcionellidae

[more]

Yoldiidae

Yoldiidae is a family of clams of the order Nuculanoida. [more]

Zardinellidae

[more]

Zerotulidae

[more]

Zonitidae

[more]

Zygitidae

[more]

Zygopleuridae

[more]

At least 7 species and subspecies belong to the Family Zygopleuridae.

More info about the Family Zygopleuridae may be found here.

Sources

Last Revised: August 25, 2014
2014/08/25 12:33:03