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Malacostraca

(Class)

Overview

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A Class in the Kingdom Animalia.

Photos

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Taxonomy

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The Class Malacostraca is a member of the Phylum Arthropoda. Here is the complete "parentage" of Malacostraca:

The Class Malacostraca is further organized into finer groupings including:

Families

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Acanthaspidiidae

[more]

Acanthogammaridae

Acanthogammaridae is a family of amphipod crustaceans, endemic to Lake Baikal. It contains the following subfamilies and genera: [more]

Acanthonotozomatidae

[more]

Acanthonotozomellidae

Acanthonotozomatidae is a family of Amphipoda comprising five genera (including those previously placed in the family Acanthonotozomellidae): [more]

Acanthotelsonidae

[more]

Actaeciidae

[more]

Aegidae

Aegidae is a family of isopod crustaceans, containing the following genera: [more]

Aeginellidae

Caprellidae is a family of amphipods commonly known as skeleton shrimps. Their common name denotes the threadlike slender body which allows them to virtually disappear among the fine filaments of seaweed, hydroids and bryozoans. They are sometimes also known as ghost shrimps. Caprellidae contains 88 genera in three subfamilies. [more]

Aeglidae

[more]

Aethridae

Aethridae is a family of crabs in its own superfamily, Aethroidea. It contains the following genera (extinct genera marked ?): [more]

Agathotanaidae

[more]

Agnaridae

Agnaridae is a family of woodlice. They were formerly considered part of the , but were moved from that family to Porcellionidae in 1989, and then placed as a separate family in 2003. There are c.?80 species, distributed from the Mediterranean basin to East Asia. [more]

Albuneidae

Albuneidae is a little-known family of specialized burrowing sand crabs. There are 50 extant species as well as nine fossil species that have been described. Fossil specimens have been described from the Cretaceous, Miocene and Oligocene. [more]

Allocrangonyctidae

Allocrangonyx is a genus of troglobitic amphipod crustaceans from the South Central United States. The two species are both listed as vulnerable on the IUCN Red List. The animals are blind and unpigmented. During the male's development, the outer ramus of the third uropod differentiates into secondary segments and grows to a length greater than the animal's body length. [more]

Alloniscidae

[more]

Alpheidae

Alpheidae is a family of caridean snapping shrimp characterized by having asymmetrical claws, the larger of which is typically capable of producing a loud snapping sound. Other common names of these species include pistol shrimp or alpheid shrimp. [more]

Alvinocarididae

Alvinocarididae is a family of shrimp, originally described by M. L. Christoffersen in 1986 from samples collected by DSV Alvin, from which they derive their name. Shrimp of the family Alvinocarididae generally inhabit deep sea hydrothermal vent regions, and hydrocarbon cold seep environments. Carotenoid pigment has been found in their bodies. The family Alvinocarididae comprises 7 extant genera. [more]

Amaryllididae

Amaryllididae is a family of marine benthic amphipods found throughout the southern hemisphere. These smooth, laterally compressed amphipods can be distinguished by the accessory setal row of the mandible having a distal tuft. It contains the following genera: [more]

Amathillopsidae

[more]

Ampeliscidae

Ampeliscidae is a family of amphipods, distinct enough to warrant placement in a monotypic superfamily Ampeliscoidea. They are benthic, found at the bottom of seas and oceans. They are distributed worldwide, and are often abundant in areas with fine sediments. They live in infaunal tubes, constructed from "amphipod silk" and sediment. [more]

Amphilochidae

Amphilochidae is a family of amphipod crustaceans, containing the following genera: [more]

Amphionididae

Amphionides reynaudii is the sole representative of the order Amphionidacea, and is a small (less than one inch long) planktonic crustacean found throughout the world's tropical oceans, mostly in shallow waters. [more]

Amphisopodidae

[more]

Amphithoidae

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Amphitoidae

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Ampithoidae

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Anamixidae

Leucothoidae is a family of amphipods. It contains 138 species in 6 genera: [more]

Anapronoidae

[more]

Anarthruridae

[more]

Anaspididae

Anaspididae is a family of freshwater crustacean that is endemic to Tasmania, Australia. The family contains 3 genera and 5 species. This group of crustaceans are considered living fossils. They are commonly and collectively known as the Tasmanian anaspid crustaceans. Anaspidids have stalked eyes, long antennae and antennules, and a slender body with no carapace. The two species of Allanaspides and the single species of Paranaspides are all listed as vulnerable on the IUCN Red List. [more]

Anatylidae

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Anchistioididae

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Ancinidae

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Anisogammaridae

Anisogammaridae is a family of small benthic amphipods. [more]

Antarcturidae

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Antheluridae

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Anthracocarididae

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Anthuridae

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Anuropidae

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Anuropodidae

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Aoridae

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Apseudellidae

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Apseudidae

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Archaeocumidae

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Archaeoscinidae

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Arcturidae

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Arcturididae

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Argissidae

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Aristeidae

[more]

Aristiidae

[more]

Armadillidae

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Armadillidiidae

Armadillidiidae is a family of woodlice, a terrestrial crustacean group in the order Isopoda. Unlike members of other woodlouse families, members of this family can roll into a ball, an ability they share with the outwardly similar but unrelated pill millipedes and other animals. It is this ability which gives woodlice in this family their common name of pill bugs, roly polies or potato bugs. The best known species in the family is Armadillidium vulgare, the common pill bug. [more]

Artesiidae

[more]

Asellidae

Asellidae is a family of isopod crustaceans. It is one of the largest families of freshwater isopods, living in both epigean and hypogean habitats in North America and Europe. The family includes the following genera: [more]

Astacidae

The family Astacidae comprises the freshwater crayfish native to Europe and western North America. It is made up of three genera. Pacifastacus is found on the Pacific coast of the United States and British Columbia and includes the signal crayfish and the Shasta crayfish. The genera Astacus and Austropotamobius are both found throughout Europe and parts of western Asia. [more]

Astyridae

[more]

Atelecyclidae

Atelecyclidae is a family of crabs belonging to the Cancroidea superfamily, and currently containing eight genera two of which are extinct. However, the genera other than do not belong in the Cancroidea, and are to be removed from the family. [more]

Atlantasellidae

Atlantasellus is a genus of crustaceans, and the only member of the family Atlantasellidae. It contains the following species: [more]

Atyidae

Atyidae is a family of shrimp, present in all tropical and most temperate waters of the world. Adults of this family are almost always confined to fresh water. This is the only family in the superfamily Atyoidea. [more]

Austrarcturellidae

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Axianassidae

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Axiidae

Axiidae is a family of thalassinidean crustaceans. It includes the following genera : [more]

Balloniscidae

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Barybrotidae

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Bateidae

Bateidae is a family of amphipod crustaceans, comprising the single genus Batea, which in turn contains thirteen species: [more]

Bathynataliidae

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Bathynellidae

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Bathypalaemonellidae

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Bathysquillidae

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Bathytropidae

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Belliidae

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Benthesicymidae

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Bentheuphausiidae

Bentheuphausia amblyops, the deep sea krill is a species of krill, small shrimp-like crustaceans living in the ocean. B. amblyops is the only species within its genus, which in turn is the only genus within the family Bentheuphausiidae. All the 85 other species of krill known are classified in the family Euphausiidae. [more]

Berytoniscidae

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Biancolinidae

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Bodotriidae

Bodotriidae is a family of crustaceans belonging to the order Cumacea. [more]

Bogidiellidae

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Bopyridae

Bopyridae is a family of isopod crustaceans in the suborder Cymothoida. Members of the family are ectoparasites of crabs and shrimps. They live in the gill cavities or on the carapace where they cause a noticeable swelling. Fossil crustaceans have occasionally been observed to have a similar characteristic bulge. [more]

Bougisidae

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Bresiliidae

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Buddelundiellidae

Trichoniscidae are a family of isopods (woodlice), including the most abundant British woodlouse, Trichoniscus pusillus. [more]

Bythograeidae

[more]

Cabiropidae

Cabiropidae is a family of isopod crustaceans in the suborder Cymothoida. The original description was made by Giard and Bonnier in 1887. Members of the family are hyperparasites of other parasitic isopods in the order and some are parasites on other free living isopods. [more]

Calabozoidae

Calabozoidae is a family of isopod crustaceans, placed in its own order, Calabozoida or Calabozoidea. It comprises two genera, and Pongycarcina. [more]

Calappidae

Calappidae is a family of crabs containing 16 genera, of which 7 are only known as fossils: [more]

Callianassidae

Callianassidae is a family of ghost shrimp of the order Decapoda. It is divided into 13 subfamilies and 42 genera: [more]

Callianideidae

[more]

Calliopidae

Calliopiidae is a family of amphipods, containing the following genera: [more]

Calliopiidae

Calliopiidae is a family of amphipods, containing the following genera: [more]

Calocarididae

[more]

Cambaridae

Cambaridae is the largest of the three families of freshwater crayfish, with over 400 species. Most of the species in the family are native to North America east of the Great Divide, such as the invasive species Procambarus clarkii and Orconectes rusticus, with fewer species living in East Asia and Japan, such as zarigani (Cambaroides japonicus). [more]

Campylaspidae

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Campylonotidae

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Cancridae

Cancridae is a family of crabs. It comprises six extant genera, and eleven exclusively fossil genera, in two subfamilies: [more]

Caprellidae

Caprellidae is a of amphipods. [more]

Caprellidea

Caprellinoididae

Caprellidae is a family of amphipods commonly known as skeleton shrimps. Their common name denotes the threadlike slender body which allows them to virtually disappear among the fine filaments of seaweed, hydroids and bryozoans. They are sometimes also known as ghost shrimps. Caprellidae contains 88 genera in three subfamilies. [more]

Caprogammaridae

[more]

Carangoliopsidae

[more]

Carpiliidae

Carpilioidea is a superfamily of crabs containing a single extant family, Carpiliidae and three extinct families. The modern range of the family includes the Indo-Pacific, Western Atlantic and Caribbean Sea. The fossil record of the group extends back at least as far as the Paleocene. [more]

Caspicolidae

[more]

Ceinidae

Ceinidae is a family of amphipods. Until 1972, they were considered part of the family Phliantidae. Some genera previously included in this family have been transferred to the family Hyalidae. [more]

Ceratiocarididae

[more]

Ceratocumatidae

Ceratocumatidae is a family of crustaceans of the order Cumacea. Ceratocumatidae have a small free telson. The endopods (interior branches) of the uropods are present on only one segment. Males have 5, 4 or 3 pairs of pleopods. All maxillipeds and some of the pereiopods bear (outer branches). The gill apparatus has no supporting gill plates. [more]

Chaetiliidae

Chaetiliidae is a family of isopod crustaceans in the suborder Valvifera, comprising the following genera: [more]

Cheiragonidae

Cheiragonidae is a small family of crabs, sometimes called helmet crabs, placed in its own superfamily, Cheriagonoidea. It comprises three extant species, Erimacrus isenbeckii, and Telmessus cheiragonus, and 13 extinct species in the three genera Karasawaia, Montezumella and Stintonius. Many of these crabs were formerly treated as members of the Atelecyclidae. The family's fossil record extends back at least as far as the Eocene. [more]

Cheluridae

Cheluridae is a family of amphipods. It is the only family classified under the superfamily Cheluroidea. [more]

Chirostylidae

Squat lobsters are decapod crustaceans of the families Galatheidae, Chirostylidae and Kiwaidae, including the common genera Galathea and Munida. They are not lobsters at all, but are more closely related to porcelain crabs, hermit crabs and then, more distantly, true crabs. They are distributed worldwide in the oceans, and occur from near the surface to deep sea hydrothermal vents. There are currently 870 described species. [more]

Chuneolidae

[more]

Cirolanidae

Cirolanidae is a family of isopod crustaceans, including the following genera: [more]

Coenobitidae

Coenobitidae are a family of hermit crabs, widely known for their terrestrial habits. There are 17 species in two genera: [more]

Colletteidae

[more]

Colomastigidae

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Condukiidae

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Corallanidae

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Coronididae

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Corophiidae

Corophiidae is a family of amphipods, containing the following genera: [more]

Corystidae

Corystidae is a family of crabs, in its own superfamily, Corystoidea. It includes the oldest Eubrachyuran fossil, , dating from the Bathonian (Middle Jurassic). Corystidae contains ten extant and five extinct species in eight genera: [more]

Crangonidae

The family Crangonidae is a taxon of shrimps, of the superfamily Crangonoidea, including the commercially important species Crangon crangon. Its type genus is Crangon. Twenty-four genera are included in the family: [more]

Crangonyctidae

Crangonyctidae is a family of cave-dwelling freshwater amphipod crustaceans. It contains the following genera: [more]

Cressidae

Cressidae is a family of amphipods. The family contains two genera: [more]

Cretitanaidae

[more]

Crinoniscidae

Crinoniscidae is a family of isopod crustaceans in the suborder Cymothoida. The original description was made by Bonnier in 1900. Members of this family are parasites, mostly on other crustaceans. is parasitic on the barnacle, Balanus perforatus. [more]

Cryptochiridae

Cryptochiridae is a family of crabs, known as gall crabs, because the females cause corals to form protective galls around themselves. The family is placed in its own superfamily, Cryptochiroidea. It contains the following genera: [more]

Cryptoniscidae

Cryptoniscidae is a family of isopod crustaceans in the suborder Cymothoida. The original description was made by Kossmann in 1880. Liriopsidae is a junior synonym. Members of this family are hyperparasites of rhizocephalid barnacles which are themselves parasites of decapod crustaceans. The morphology of the adult females gives little clue as to their true identity but the free living larvae show their true taxonomic affiliations. [more]

Ctenochelidae

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Cumacea

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Cyamidae

A whale louse is a parasitic crustacean of the family Cyamidae. They are related to the better-known skeleton shrimp, most species of which are found in shallower waters. Whale lice are external parasites, found in skin lesions, genital folds, nostrils and eyes of marine mammals of the order Cetacea. These include not only whales but also dolphins and porpoises. [more]

Cyclodorippidae

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Cylisticidae

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Cyllopodidae

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Cymonomidae

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Cymothoidae

Cymothoidae is a family of isopods. Several species are parasites, usually of fish. These include the bizarre "tongue-biter", Cymothoa exigua. Around forty genera are recognised  [more]

Cyphocarididae

[more]

Cyproideidae

Cyproideidae is a family of amphipod crustaceans. Eighteen genera and 43 species have been described as of 2009. They mostly occur mostly in the Southern Hemisphere, where they form associations with corals, sponges, crinoids and hydroids. [more]

Cyproniscidae

Cyproniscidae is a family of marine isopod crustaceans in the suborder Cymothoida. The original description was made by Bonnier in 1900. Members of this family are parasitic on other isopods. [more]

Cystisomatidae

[more]

Dairellidae

[more]

Dairidae

Dairoidea is a superfamily of crabs, comprising two families which each contain a single genus: Dairidae (the living fossil  ) and Dacryopilumnidae (Dacryopilumnus) . [more]

Dajidae

Dajidae is a family of marine isopod crustaceans in the suborder Cymothoida. The original description was made by Giard and Bonnier in 1887. Members of this family are ectoparasites of krill. They resemble a fleshy growth on the krill's back, and make the host look as if it is wearing a rucksack. The following genera are included in the famiyl Dajidae: [more]

Daldorfiidae

[more]

Deckeniidae

Potamonautidae is a family of freshwater crabs endemic to tropical parts of Africa and adjacent islands, including Madagascar, the Seychelles, Zanzibar, Mafia, Pemba, Bioko, S?o Tom?, Pr?ncipe and Sherbro Island. It comprises 18 extant genera and 138 extant species. Fossil remains dating from the Late Miocene period have been attributed to the family Potamonautidae. [more]

Delatorreidae

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Dendrotiidae

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Dendrotionidae

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Desmosomatidae

[more]

Detonidae

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Dexaminidae

Dexaminidae is a family of amphipods. It contains the following genera: [more]

Diastylidae

Diastylidae is one of the eight most commonly recognised families of crustaceans of the order Cumacea. They are marine creatures especially common around the 30th parallel north. [more]

Diogenidae

Diogenidae is a family of hermit crabs, sometimes known as "left-handed hermit crabs" because in contrast to most other hermit crabs, it is the left chela (claw) that is enlarged instead of the right. It comprises 429 extant species, and a further 46 extinct species, making it the second largest family of marine hermit crabs, after Paguridae. [more]

Disciadidae

[more]

Dogielinotidae

Dogielinotidae is a family of amphipods. It is currently subdivided into three subfamilies, containing a total of twelve genera: [more]

Dorippidae

[more]

Dromiidae

Dromiidae is a family of crabs, often referred to as sponge crabs. They are small or medium-sized crabs which get their name from the ability to shape a living sponge into a portable shelter for themselves. A sponge crab cuts out a fragment from a sponge and trims it to its own shape using its claws. The last two pairs of legs are shorter than other legs and bend upward over the crab's carapace, to hold the sponge in place. The sponge grows along with the crab, providing a consistent shelter. [more]

Dubioniscidae

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Dulichiidae

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Dynomenidae

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Echinothambematidae

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Endevouridae

[more]

Enoplometopidae

Reef lobsters, Enoplometopus, are a genus of small lobsters that live on reefs in the Indo-Pacific, Caribbean and warmer parts of the east Atlantic Ocean. [more]

Entoniscidae

Entoniscidae is a family of marine isopod crustaceans in the suborder Cymothoida. The original description was made by in 1881. [more]

Eophliantidae

Eophliantidae is a family of amphipods, containing the following genera: [more]

Epialtidae

Epialtidae is a family of crabs, containing the subfamilies: [more]

Epimeriidae

Epimeriidae is a family of amphipods, containing the following genera: [more]

Eriphiidae

[more]

Erymidae

[more]

Eryonidae

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Eubelidae

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Eucopiidae

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Eugonatonotidae

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Eumedonidae

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Euphausiidae

Krill is the common name given to the order Euphausiacea of shrimp-like marine crustaceans. Also known as euphausiids, these small invertebrates are found in all oceans of the world. The common name krill comes from the Norwegian word , meaning "young fry of fish", which is also often attributed to other species of fish. [more]

Eurycopidae

[more]

Eurysquillidae

Eurysquillidae is a family of mantis shrimp. Formerly placed in the superfamily , it has since been recognised that eurysquillids are closer to families in the Squilloidea, and so Eurysquillidae has been placed in its own superfamily, Eurysquilloidea. It includes six genera: [more]

Eusiridae

Eusiridae is a family of amphipods. It contains the following genera: [more]

Exoedicerotidae

[more]

Expanathuridae

[more]

Galatheidae

Squat lobsters are decapod crustaceans of the families Galatheidae, Chirostylidae and Kiwaidae, including the common genera Galathea and Munida. They are not lobsters at all, but are more closely related to porcelain crabs, hermit crabs and then, more distantly, true crabs. They are distributed worldwide in the oceans, and occur from near the surface to deep sea hydrothermal vents. There are currently 870 described species. [more]

Gammaracanthidae

[more]

Gammarellidae

Gammarellidae is a family of amphipods containing three genera: [more]

Gammaridae

Gammaridae is a family of amphipods. In North America they are included among the folk taxonomic category of "scuds", and otherwise gammarids is usually used as a common name. [more]

Gammaroporeiidae

[more]

Gecarcinidae

Gecarcinidae is a family of true crabs that are adapted for terrestrial existence, commonly known as land crabs. Similar to all other crabs, land crabs possess a series of gills. In addition, the part of the carapace covering the gills is inflated and equipped with blood vessels. These organs extract oxygen from the air, analogous to the vertebrate lungs. Adult land crabs are terrestrial, but visit the sea periodically, where they breed and their larvae develop. Land crabs are tropical omnivores which sometimes cause considerable damage to crops. Most land crabs have one of their claws larger than the other. [more]

Gecarcinucidae

Gecarcinucidae is a family of freshwater crabs. Some scientists also include the genera placed in the family Parathelphusidae in a larger Gecarcinucidae. [more]

Geryonidae

[more]

Gigantapseudidae

[more]

Glypheidae

The Glypheoidea (containing the glypheoid lobsters), is a group of lobster-like decapod crustaceans which forms an important part of fossil faunas, such as the Solnhofen limestone. These fossils included taxa such as Glyphea (from which the group takes its name), and Mecochirus, mostly with elongated (often semichelate) chelipeds. This group of decapods is a good example of a living fossil, or a lazarus taxon, since until their discovery in the 1970s, the group was considered to have become extinct in the Eocene. The superfamily Glypheoidea comprises five families. The two extant species, Neoglyphea inopinata and Laurentaeglyphea neocaledonica, are both in the Glypheidae. [more]

Glyphocrangonidae

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Glyptograpsidae

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Gnathidae

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Gnathiidae

Gnathiidae is a family of isopod crustaceans. They occur in a wide range of depths, from the littoral zone to the deep sea. The adults are associated with sponges and may not feed. The juvenile form is known as a praniza larva, and it is a temporary parasite of marine fish. [more]

Gnathophyllidae

Gnathophyllidae is a pantropical and subtropical family of shrimp in the superfamily Palaemonoidea. They are often associated with echinoderms. [more]

Gnathostenetroididae

[more]

Goneplacidae

Goneplacidae is a family of crabs of the order Decapoda and the superfamily Goneplacoidea. It includes the following genera: [more]

Gonodactylidae

Gonodactylidae is a family of mantis shrimp. It contains the following genera: [more]

Grapsidae

Grapsidae is a family of crabs known variously as marsh crabs, shore crabs or talon crabs. It is not confirmed that the family forms a monophyletic group and some taxa may belong in other families. They are found along the shore among rocks, in estuaries, marshes, and in some cases pelagic among drifting seaweeds and flotsam. [more]

Gynodiastylidae

Gynodiastylidae is one the eight most commonly recognised families of crustaceans of the order Cumacea. They are especially prevalent in the southern hemisphere, with some types described from Japan, Thailand and the Persian Gulf. Most are found at less than 100 metres (330 ft) depth. [more]

Hadromastacidae

[more]

Hadziidae

Hadziidae is a family of amphipods, which is difficult to distinguish from the related family Melitidae. It contains the following genera: [more]

Halophilosciidae

[more]

Hapalocarcinidae

[more]

Haplomunnidae

[more]

Haploniscidae

[more]

Harpiosquillidae

[more]

Haustoriidae

Haustoriidae is a family of amphipods. They are very distinctive stout-bodied burrowing animals. [more]

Hekelidae

[more]

Hemioniscidae

Hemioniscidae is a family of marine isopod crustaceans in the suborder Cymothoida. The original description was made by Bonnier in 1900. Members of this family are parasitic on cirripede barnacles. [more]

Hemisquillidae

[more]

Hepatidae

[more]

Hexapodidae

[more]

Hippidae

Hippidae is a family of decapod crustaceans, commonly known as "mole crabs" or "sand crabs". They are closely related to the family Albuneidae, with which they are usually joined in the superfamily Hippoidea. The family Hippidae comprises the three genera Emerita, Hippa and . They burrow into sand, and are found throughout the world, except the Arctic and Antarctic. [more]

Hippolytidae

Hippolytidae is a family of cleaner shrimp, also known as broken-back shrimp or anemone shrimp. The term "broken-back shrimp" also applies to the genus Hippolyte in particular and "cleaner shrimp" is sometimes applied exclusively to Lysmata amboinensis. [more]

Hirsutiidae

[more]

Holidoteidae

[more]

Holognathidae

[more]

Homolidae

The family Homolidae, known as carrier crabs or porter crabs, contains 14 genera of marine crabs. They mostly live on the continental slope and continental shelf, and are rarely encountered. Members of the Homolidae have their fifth pereiopods (last pair of walking legs) in a sub-dorsal position, which allows them to hold objects in place over the rear half of the carapace. The objects carried include sponges, black corals and gorgonians, and this is behaviour may be a defence mechanism against predators. Some species have been observed carrying living sea urchins in a symbiotic relationship which allows them to benefit from the protection of the urchin's dangerous spikes. [more]

Homolodromiidae

Homolodromiidae is a family of crabs, the only family in the superfamily Homolodromioidea. In contrast to other crabs, including the closely related Homolidae, there is no strong linea homolica along which the exoskeleton breaks open during ecdysis. The family comprises two genera, , which has 18 species, and Homolodromia, with five species. [more]

Hyalellidae

Dogielinotidae is a family of amphipods. It is currently subdivided into three subfamilies, containing a total of twelve genera: [more]

Hyalidae

Hyalidae is a family of amphipods, containing 12 genera in two unequal subfamilies: [more]

Hymenoceridae

[more]

Hymenosomatidae

Hymenosomatidae is a family of crabs with some 110 described species in nearly 20 genera. The following genera are placed in the Hymenosomatidae: [more]

Hyperiidae

Hyperiidae is a family of amphipods, containing the following genera: [more]

Hyperiopsidae

Hyperiopsidae is a family of amphipods, comprising the genera and Parargissa. [more]

Hypsimetopodidae

[more]

Hyssuridae

[more]

Idoteidae

Idoteidae is a family of isopod crustaceans. It includes the following genera: [more]

Ilyarachnidae

[more]

Inachidae

Inachidae is a family of crabs, containing 39 genera: [more]

Inachoididae

[more]

Indosquillidae

[more]

Ingolfiellidae

Ingolfiellidae is a family of amphipod crustaceans, comprising the following genera: [more]

Iphimediidae

[more]

Irmaosidae

[more]

Isaeidae

Isaeidae is a family of amphipods. It is the only family classified under the superfamily Isaeoidea. It contains the following genera: [more]

Ischnomesidae

[more]

Ischyroceridae

Ischyroceridae is a family of amphipods. It contains the following genera: [more]

Isolapotamidae

[more]

Iulopididae

[more]

Janirellidae

[more]

Janiridae

[more]

Joeropsididae

[more]

Jurapseudidae

[more]

Kalliapseudidae

[more]

Katianiridae

[more]

Keuphyliidae

[more]

Kiwaidae

[more]

Koonungidae

[more]

Kuriidae

[more]

Lafystiidae

[more]

Lampropidae

Lampropidae is a family of cold-water crustaceans belonging to the order Cumacea. Members of Lampropidae are relatively easily recognised because they all at have at least three terminal setae on the telson (rigid fibres on the end of the tail). The telson is medium to large and not fused with the last segment of the pleon. The endopods (interior branches) of the uropods are present on all three members. In the males the flagellum of the second antenna reaches beyond the carapace; moreover, they possess pleopods. In the females the second antenna is somewhat shorter than the first. There are (outer branches) on the third maxilliped and strongly reduced or absent on the third pereopods. [more]

Lanceolidae

[more]

Laomediidae

[more]

Laphystiidae

[more]

Laphystiopsidae

[more]

Latreilliidae

Latreilliidae is a small family of crabs. They are relatively small, long-legged crabs found on soft bottoms at depths of up 700 metres (2,300 ft) in mostly tropical and subtemperate waters around the world. The family and its type genus are named after Pierre Andr? Latreille. It comprises seven extant species: [more]

Lepechinellidae

[more]

Lepidomysidae

[more]

Leptanthuridae

Leptanthuridae is a family of isopod crustaceans, containing the following genera: [more]

Leptocheliidae

[more]

Leptognathiidae

[more]

Lestrigonidae

[more]

Leuconidae

Leuconidae is a family of marine hooded shrimp (order Cumacea). These malacostracan crustaceans belong to the superorder Peracarida, unlike true shrimp, which are Eucarida. The family was established by Georg Ossian Sars in his 1878 study of Mediterranean cumaceans. [more]

Leucosiidae

Leucosiidae is a family of crabs containing three subfamilies and a number of genera incertae sedis: [more]

Leucothoidae

Leucothoidae is a family of amphipods. It contains 138 species in 6 genera: [more]

Ligiidae

Ligiidae is a family of woodlice, the only family in the infraorder Diplocheta. Its members are common on rocky shores, in similar habitats to those inhabited by species of the bristletail Petrobius and the crab Cyclograpsus. The family contains the following genera: [more]

Liljeborgiidae

Liljeborgiidae is a family of amphipods, containing the following genera: [more]

Limnoriidae

A gribble (or gribble worm) is any of about 56 species of marine isopod from the family Limnoriidae. They are mostly pale white and small (1?4 millimetres or 0.04?0.16 inch long) crustaceans, although from subantarctic waters can reach 10 mm (0.4 in). [more]

Lithodidae

King crabs, also called stone crabs, are a superfamily of crab-like decapod crustaceans chiefly found in cold seas. Because of their large size and the taste of their meat, many species are widely caught and sold as food, the most common being the red king crab, Paralithodes camtschaticus. [more]

Lomisidae

[more]

Lophogastridae

[more]

Luciferidae

Lucifer is a little-known and degenerate genus of prawns, the only genus in the family Luciferidae. Lucifer has a long body, but many fewer appendages than other prawns, with only three pairs of pereiopods remaining, all without claws. It also bears no gills. The females, uniquely among prawns, carry the fertilised eggs on her pleopods until they are ready to hatch. This parallels the development of a similar system in pleocyemates, although the attachment is less strong in Lucifer. The length of the eye-stalks and the form of the are used in distinguishing the eight species from each other. Seven species are recognised: [more]

Lycaeidae

[more]

Lycaeopsidae

[more]

Lysianassidae

Lysianassidae is a family of marine amphipods, containing the following genera: [more]

Lysiosquillidae

Lysiosquillidae is a family of mantis shrimp, containing the following genera : [more]

Macrohectopidae

[more]

Macrostylidae

[more]

Maiidae

[more]

Majidae

Majidae is a family of crabs, comprising around 200 marine species with a carapace that is longer than it is broad, and which forms a point at the front. The legs can be very long in some species, leading to the name "spider crab". The exoskeleton is covered with bristles to which the crab attaches algae and other items to act as camouflage. [more]

Malacostraca

[more]

Matutidae

[more]

Maxillipiidae

[more]

Mecochiridae

[more]

Megaluropidae

[more]

Melitidae

Melitidae is a family of amphipods. It contains around 45 genera, and formerly included a further 40 genera that are now placed in the family . [more]

Melphidippidae

Melphidippidae is a family of amphipods which rest upside-down and feed on particles of food suspended in the water. Three genera are recognised: [more]

Menippidae

Menippidae is a family of crabs of the order Decapoda. [more]

Mesogammaridae

[more]

Mesoniscidae

[more]

Mesosignidae

[more]

Metaingolfiellidae

[more]

Metapseudidae

[more]

Micheleidae

[more]

Microcerberidae

Microcerberidae is a family of isopod crustaceans. They are less than 2 millimetres (0.08 in) long, and live interstitially in shallow marine or freshwater sand habitats. [more]

Microparasellidae

[more]

Microphasmatidae

[more]

Microphasmidae

[more]

Mictocarididae

Mictocaris halope is the only species of freshwater crustacean in the monotypic genus Mictocaris. It is placed in its own family, Mictocarididae, and is sometimes considered the only member of the order Mictacea. Mictocaris is endemic to anchialine caves in Bermuda, and grows up to 3.5 mm (0.14 in) long. Its biology is poorly known. [more]

Mictosomatidae

[more]

Mictyridae

[more]

Mimonectidae

[more]

Mithracidae

[more]

Monodellidae

[more]

Munnidae

[more]

Munnopsidae

[more]

Munnopsididae

[more]

Mysidacea

[more]

Mysidae

Mysidae is a family of crustaceans in the order Mysida or mysid shrimps. Six sub-families are recognised: [more]

Najnidae

[more]

Nannastacidae

Nannastacidae is a family of crustaceans belonging to the order Cumacea. [more]

Nannoniscidae

[more]

Nannosquillidae

Nannosquillidae is a family of stomatopods, comprising the following genera: [more]

Nebaliidae

Nebaliidae is the largest of the three families of leptostracan crustaceans, containing 33 of the 40 described species. Its members may be dinstinguished from members of the other two families by the tapering form of the caudal furcae (which is broader in Nebaliopsididae), and by the callynophores of the antennae in mature males, which are swollen in but not in Nebaliidae. [more]

Nebaliopsidae

Nebaliopsididae is a family of leptostracan crustaceans. It contains only two species, Nebaliopsis typica and . [more]

Nebaliopsididae

Nebaliopsididae is a family of leptostracan crustaceans. It contains only two species, Nebaliopsis typica and . [more]

Necrocarcinidae

[more]

Nematocarcinidae

[more]

Neomegamphopidae

Neomegamphopidae is a family of amphipods, comprising the two genera and Neomegamphopus. A third genus, Komatopus, may be a synonym of Magaropsis. [more]

Neoniphargidae

[more]

Neotanaidae

[more]

Neotanidae

[more]

Nephropidae

Clawed lobsters comprise a family (Nephropidae, sometimes also Homaridae) of large marine crustaceans. Highly prized as seafood, lobsters are economically important, and are often one of the most profitable commodities in coastal areas they populate. [more]

Nichollsiidae

[more]

Nihotungidae

[more]

Niphargidae

Niphargidae is a family of amphipods. It contains the following genera: [more]

Nototanaidae

[more]

Ochlesidae

Ochlesidae is a family of amphipods. They are very small, often less than 1.5 millimetres (0.06 in) long, and are found mainly in tropical and subtropical areas of the Southern Hemisphere. The family Odiidae has sometimes been subsumed into Ochlesidae. [more]

Ocypodidae

Ocypodidae is a family of crabs that includes the ghost crabs and fiddler crabs. Other genera previously included in the family are now treated as members of separate families in the superfamily Ocypodoidea, such as Ucididae, Dotillidae and Macrophthalmidae. [more]

Odiidae

Odiidae is a family of amphipods, sometimes included in the family Ochlesidae. It includes the following genera: [more]

Odontodactylidae

Odontodactylus is a genus of mantis shrimp, the only genus in the family Odontodactylidae. Mantis shrimp of the genus Odontodactylus can not only detect circular polarisation of light, but can polarise light reflecting off their telson and uropods. [more]

Oedicerotidae

Oedicerotidae is a family of amphipods. It comprises the following genera: [more]

Ogyrididae

[more]

Olibrinidae

[more]

Oniscidae

Oniscidae is a family of woodlice, including the common woodlouse Oniscus asellus. Six genera are certainly placed in the family (Oniscus, , Phalloniscus, Rabdoniscus, Rodoniscus and Sardoniscus), with eight others included by some sources (Cerberoides, Diacara, Exalloniscus, Hanoniscus, Hiatoniscus, Hora, Krantzia and Tasmanoniscus). [more]

Ophthalmopseudidae

[more]

Opisidae

[more]

Oplophoridae

The family Oplophoridae is a taxon of pelagic shrimps and the only subtaxon of the superfamily Oplophoroidea. It contains the following genera: [more]

Oregoniidae

Oregoniidae is a family of crabs, formerly included in the family Majidae. It contains the four genera Chionoecetes, Hyas, and Oregonia. [more]

Oxycephalidae

[more]

Pagetinidae

[more]

Pagurapseudidae

Pagurapseudidae is a family of crustaceans in the order Tanaidacea. Like hermit crabs, they inhabit empty gastropod shells, but can be told apart from hermit crabs by the lack of a carapace, revealing the segmentation of the thorax, and by the greater number of legs: hermit crabs have five pairs of legs, of which the first has large claws, and the last is highly reduced, while in Pagurapseudidae, there is one pair of claws, plus six further walking legs. [more]

Paguridae

Paguridae is a family of hermit crabs of the order Decapoda. It contains 542 species in over 70 genera: [more]

Palaemonidae

Palaemonidae is a family of crustaceans of the order Decapoda. They belong to the infraorder Caridea, which contains the true shrimp; while some freshwater palaemonid species are known as "prawns", the family belongs to the suborder Pleocyemata like all true shrimp, whereas the true prawns are members of the suborder Dendrobranchiata. [more]

Palicidae

The family Palicidae, sometimes called stilt crabs, are a group of crabs. Some genera previously included in this family are now placed in a separate family, the . [more]

Palinuridae

Spiny lobsters, also known as langouste or rock lobsters, are a family (Palinuridae) of about 60 species of achelate crustaceans, in the Decapoda Reptantia. Spiny lobsters are also, especially in Australia, New Zealand and South Africa, sometimes called crayfish, sea crayfish or crawfish, terms which elsewhere are reserved for freshwater crayfish. [more]

Pandalidae

The family Pandalidae is a taxon of Caridean shrimp. These species are commonly called pandalid shrimps. They are edible and have high economic value. They are characterized by the subdivided carpus of the second pereiopod and, mainly, by the lack of the chelae of the first pereiopod. This is a cold-water family, and their representation in tropical areas is made by deep-sea shrimps. The genus Physetocaris, sometimes placed in this family, is now considered to be in its own family. [more]

Panopeidae

Panopeidae is a family of crabs, containing the following subfamilies and genera: [more]

Parabathynellidae

[more]

Paracalliopiidae

[more]

Paracercopidae

Caprellidae is a family of amphipods commonly known as skeleton shrimps. Their common name denotes the threadlike slender body which allows them to virtually disappear among the fine filaments of seaweed, hydroids and bryozoans. They are sometimes also known as ghost shrimps. Caprellidae contains 88 genera in three subfamilies. [more]

Paracrangonytidae

[more]

Paramelitidae

Paramelitidae is a family of amphipods, containing the following genera: [more]

Paramphithoidae

[more]

Paramunnidae

[more]

Paranebaliidae

[more]

Paranthuridae

[more]

Parapaguridae

Parapaguridae is a family of terrestrial hermit crabs. They have gill chambers that function as lungs. Some genera, such as and Tylaspis, do not inhabit shells. The following genera are included: [more]

Paraphronimidae

[more]

Parapseudidae

[more]

Parascelidae

[more]

Parasquillidae

Parasquillidae is a family of mantis shrimp containing the three genera , Parasquilla and Pseudosquillopsis. It was previously included in the superfamily Gonodactyloidea, but that group was found to be paraphyletic, and a new superfmaily, Parasquilloidea was erected. [more]

Parastacidae

Parastacidae is the family of freshwater crayfish found in the southern hemisphere. The family is a classic Gondwana-distributed taxon, with extant members in South America, Madagascar, Australia, New Zealand and New Guinea, and extinct taxa also in Antarctica. [more]

Paratanaidae

[more]

Parathelphusidae

[more]

Pardaliscidae

Pardaliscidae is a family of amphipods, including the deepest collections made by the Galathea expeditions. It contains the following genera: [more]

Pariambidae

Caprellidae is a family of amphipods commonly known as skeleton shrimps. Their common name denotes the threadlike slender body which allows them to virtually disappear among the fine filaments of seaweed, hydroids and bryozoans. They are sometimes also known as ghost shrimps. Caprellidae contains 88 genera in three subfamilies. [more]

Parthenopidae

Parthenopidae is a family of crabs, placed in its own superfamily, Parthenopoidea. It comprises nearly 40 genera, divided into two subfamilies, with three genera incertae sedis: [more]

Pasiphaeidae

Pasiphaeidae is a family of shrimps. It is the only family in the superfamily Pasiphaeoidea and contains seven extant genera: [more]

Pemphicidae

[more]

Penaeidae

Penaeidae is a family of prawns, although they are often referred to as penaeid shrimp. It contains many species of economic importance, such as the tiger prawn (Penaeus monodon), whiteleg shrimp, Atlantic white shrimp and Indian prawn. Many prawns are the subject of commercial fishery, and farming, both in marine settings, and in freshwater farms. Lateral line-like sense organs on the antennae have been reported in some species of Penaeidae. At 210 metres per second (760 km/h), the myelinated giant interneurons of pelagic penaeid shrimp have the world record for impulse conduction speed in any animal. [more]

Petalophthalmidae

[more]

Philosciidae

Philosciidae are a family of woodlice (terrestrial isopod crustaceans). They occur almost everywhere on earth, with most species found in (sub)tropical America, Africa and Oceania, and only a few in the Holarctic. [more]

Phliantidae

Phliantidae is a family of isopod-like amphipod crustaceans chiefly from the southern hemisphere. [more]

Phoratopodidae

Phoratopus remex is a species of isopod crustacean known from only two specimens, and first described in 1925 by (1895?1963). It lives on the continental shelf at Encounter Bay and Fowlers Bay, South Australia. It is so unlike all other isopods that it is placed in its own family, Phoratopodidae and suborder, Phoratopidea. [more]

Photidae

[more]

Phoxocephalidae

[more]

Phreatogammaridae

[more]

Phreatoicidae

Phreatoicidae is a family of blind, freshwater isopods. They have survived apparently unchanged for 350 million years, and are only found in South Africa, India, Australia and New Zealand. They were first found near Christchurch in 1882 by Charles Chilton. The family Phreatoicidae now contains 13 genera: [more]

Phreatoicopsidae

[more]

Phronimidae

Phronimidae is a family of amphipod crustaceans, containing two genera: [more]

Phrosinidae

[more]

Phtisicidae

Caprellidae is a family of amphipods commonly known as skeleton shrimps. Their common name denotes the threadlike slender body which allows them to virtually disappear among the fine filaments of seaweed, hydroids and bryozoans. They are sometimes also known as ghost shrimps. Caprellidae contains 88 genera in three subfamilies. [more]

Physetocarididae

[more]

Pilumnidae

Pilumnoidea is a superfamily of crabs, whose members were previously included in the Xanthoidea. The three families are unified by the free articulation of all the segments of the male crab's abdomen and by the form of the gonopods. The Cretaceous genus is believed to belong to the Pilumnidae; apart from Titanocarcinus, the earliest fossils assigned to this group are of Eocene age. [more]

Pinnotheridae

Pinnotheridae is a family of pea crabs. Pea crabs are tiny soft-bodied crabs that live commensally in the mantles of certain bivalve molluscs (and the occasional large gastropod mollusc species in genera such as Strombus and Haliotis). The earliest fossils attributable to the Pinnotheridae date from the Danian. [more]

Pirimelidae

[more]

Pisidae

[more]

Plagusiidae

Plagusiidae is a family of crabs. It was formerly treated as a subfamily of the family Grapsidae, but has since been considered sufficiently distinct to be a family in its own right. [more]

Plakarthriidae

[more]

Platyarthridae

Platyarthridae is a family of woodlice, containing the following genera: [more]

Platyischnopidae

Platyischnopidae is a family of amphipod crustaceans. Its members are characterised by the conical rostrum, which is covered with sensory pits at the end. Although digging behaviour has only been directly observed in a few taxa, it is assumed that all the animals in the family Platyischnopidae are . The genera included in Platyischnopidae are Skaptopus, Platyischnopus, Indischnopus, Tiburonella, Eudevenopus, Tittakunara, Tomituka and Yurrokus. [more]

Platyscelidae

[more]

Platythelphusidae

Platythelphusa is a genus of freshwater crabs endemic to Lake Tanganyika. It has been placed in a number of families, including a monotypic family, Platythelphusidae, as well as Potamidae and its current position in the Potamonautidae, and has also been treated as a subgenus of Potamonautes. It forms a monophyletic group, possibly nested within the genus Potamonautes, which would therefore be paraphyletic. The genus is the only evolutionary radiation of crabs to have occurred in a freshwater lake, and it occurred recently, probably since the Pliocene. This parallels the better known radiation of cichlid fishes in Lake Tanganyika. Only one other species of freshwater crab is found in Lake Tanganyika, Potamonautes platynotus. [more]

Platyxanthidae

[more]

Pleurocopidae

[more]

Pleustidae

[more]

Podoceridae

Podoceridae is a family of amphipods. It contains eight genera: [more]

Polychelidae

The family Polychelidae contains thirty-eight extant species of blind, benthic lobster-like crustaceans. They are found throughout the world's tropical, sub-tropical and temperate oceans, including the Mediterranean Sea and the Irish Sea. [more]

Pomatochelidae

[more]

Ponderellidae

[more]

Pontogammaridae

[more]

Pontogeneiidae

[more]

Pontoporeiidae

Pontoporeiidae is a family of amphipods, containing the following genera: [more]

Porcellanidae

Porcelain crabs are decapod crustaceans in the widespread family Porcellanidae, which superficially resemble true crabs. They are typically less than 15 mm (0.6 in) wide, and have flattened bodies as an adaptation for living in rock crevices. They are delicate, readily losing limbs when attacked, and use their large claws for maintaining territories. [more]

Porcellionidae

Porcellionidae is a terrestrial family of the order Isopoda. The species classified here cannot roll into a ball, as opposed to the species of family Armadillidiidae, which can. [more]

Portunidae

Portunidae is a family of crabs which contains the swimming crabs. [more]

Potamidae

Potamidae is a family of freshwater crabs. Its more than 650 species and nearly 100 genera are divided into two subfamilies ? Potaminae around the Mediterranean Sea, on Socotra and eastwards to Northern India, and Potamiscinae in East Asia. [more]

Potamocarcinidae

[more]

Potamonautidae

Potamonautidae is a family of freshwater crabs endemic to tropical parts of Africa and adjacent islands, including Madagascar, the Seychelles, Zanzibar, Mafia, Pemba, Bioko, S?o Tom?, Pr?ncipe and Sherbro Island. It comprises 18 extant genera and 138 extant species. Fossil remains dating from the Late Miocene period have been attributed to the family Potamonautidae. [more]

Procarididae

Procarididea is an infraorder of decapods, comprising only eleven species. Six of these are in the genera Procaris and , which together make up the family Procarididae. The remaining five species are only known from fossils and belong to the genus Udora, which cannot yet be assigned to any family. Use of molecular phylogenetics suggests that the procarids are the sister group to the Caridea, and are thus recognised as a separate infraorder, Procarididea. [more]

Processidae

Processidae is a family of shrimp, comprising 65 species in 5 genera, and the only family in the superfamily Processoidea. They are small, nocturnal animals, mostly living in shallow seas, particularly on grass flats. The first pereiopods are usually asymmetrical, with a claw on one, but not the other ( forming the exception to this rule). The rostrum is generally a simple projection from the front of the carapace, with two teeth, one at the tip, and one further back. [more]

Pronoidae

[more]

Prophliantidae

[more]

Proscinidae

[more]

Prosopidae

[more]

Protellidae

Caprellidae is a family of amphipods commonly known as skeleton shrimps. Their common name denotes the threadlike slender body which allows them to virtually disappear among the fine filaments of seaweed, hydroids and bryozoans. They are sometimes also known as ghost shrimps. Caprellidae contains 88 genera in three subfamilies. [more]

Protognathiidae

[more]

Protojaniridae

[more]

Protosquillidae

[more]

Psalidopodidae

Psalidopus is a genus of shrimp placed in its own family, Psalidopodidae, and superfamily, Psalidopodoidea. It comprises three species, one in the western Atlantic Ocean, and two in the Indo-Pacific. [more]

Psammaspididae

[more]

Pseudarmadillidae

Pseudarmadillo is a genus of woodlice from the Greater Antilles. All extant species live in Cuba, with one species also extending to the Bahamas: [more]

Pseudidotheidae

[more]

Pseudocrangonyctidae

[more]

Pseudocumatidae

Pseudocumatidae are a family of crustaceans of the order Cumacea. [more]

Pseudojaniridae

[more]

Pseudomesidae

[more]

Pseudorhombilidae

[more]

Pseudosquillidae

[more]

Pseudotanaidae

[more]

Pseudothelphusidae

[more]

Pseudozeuxidae

[more]

Pseudoziidae

[more]

Pudeoniscidae

[more]

Pylochelidae

Pylochelidae is a family of hermit crabs. Its members are commonly called the symmetrical hermit crabs. They live in all the world's oceans, except the Arctic and the Antarctic, at depths of up to 2,000 metres (6,600 ft). Due to their cryptic nature and relative scarcity, only around 60 specimens had been collected before 1987, when a monograph was published detailing a further 400. [more]

Raninidae

Raninidae is a family of unusual crabs named for their frog-like appearance, taken by most scientists to be quite primitive. These animals closely resemble the (unrelated) mole crabs, due to parallel evolution or convergent evolution. In both groups, the claws are modified into tools for digging, and the body is a rounded shape that is easy to bury in sand. Unlike most other true crabs, the abdomens of raninids are not curled under the cephalothorax. [more]

Rectarcturidae

[more]

Retroplumidae

[more]

Rhinocarididae

[more]

Rhynchocinetidae

The family Rhynchocinetidae are a group of small, reclusive red-and-white shrimp. This family typically has an upward-hinged foldable rostrum, hence its taxon name Rhynchocinetidae, which means movable beak. The family contains only two genera, and Rhynchocinetes. [more]

Rhyscotidae

[more]

Salentinellidae

[more]

Santiidae

[more]

Schoebliidae

[more]

Scinidae

[more]

Scleropactidae

[more]

Scopelocheiridae

[more]

Scyllaridae

Slipper lobsters are a family of decapod crustaceans found in all warm oceans and seas. Despite their name, they are not true lobsters, but are more closely related to spiny lobsters and furry lobsters. Slipper lobsters are instantly recognisable by their enlarged antennae, which project forward from the head as wide plates. All the species are edible, and some, such as the Moreton Bay bug and the "Balmain bug" (Ibacus peronii) are of commercial importance. [more]

Scyphacidae

[more]

Sebidae

Sebidae is a family of amphipods. Its members are disjunctly distributed, occurring in the Mediterranean Sea, eastern and southern parts of the Atlantic Ocean, the southern United States, the Hawaiian Islands, the Indian Ocean, Antarctica and Australia. [more]

Sergestidae

Sergestidae is a family of prawns which have lived since at least the Albian age (Cretaceous). It contains the following genera: [more]

Serolidae

Serolidae is a family of isopod crustaceans, containing the following genera: [more]

Sesarmidae

Sesarmidae is a family of crabs, previously included in the Grapsidae by many authors. Several species, namely in Geosesarma, Metopaulias and Sesarma, are true terrestrial crabs. They do not need to return to the sea even for breeding. [more]

Sicafodiidae

[more]

Sicyoniidae

Sicyonia is a genus of prawns, placed in its own family, Sicyoniidae. It differs from other prawns in that the last three pairs of its pleopods are uniramous, rather than biramous as seen in all other prawns. [more]

Sinopotamidae

[more]

Solenoceridae

[more]

Spelaeogriphidae

[more]

Spelaeoniscidae

[more]

Sphaeromatidae

Sphaeromatidae is a family of isopods, containing the following genera: [more]

Sphaeroniscidae

[more]

Sphyrapidae

[more]

Spongicolidae

The Stenopodidea is a small group of decapod crustaceans. Often confused with shrimp or prawns, they are neither, but belong in a group closer to the reptant decapods, such as lobsters and crabs. They may be easily recognised by their third pereiopod (walking leg), which is greatly enlarged. In the lobsters and crabs, it is the first pereiopod that is much bigger than the others. There are 71 extant species currently recognised, divided into 12 genera. Two fossil species are also recognised, each belonging to a separate genus. The earliest fossil assigned to the Stenopodidea is Jilinicaris chinensis from the Late Cretaceous. [more]

Squillidae

Squillidae is a family of mantis shrimp, the only family in the superfamily Squilloidea . It contains the following genera : [more]

Stegocephalidae

Stegocephalidae is a little-studied family of amphipods belonging to the suborder Gammaridea. [more]

Stenasellidae

[more]

Stenetriidae

[more]

Stenoniscidae

[more]

Stenopodidae

The Stenopodidea is a small group of decapod crustaceans. Often confused with shrimp or prawns, they are neither, but belong in a group closer to the reptant decapods, such as lobsters and crabs. They may be easily recognised by their third pereiopod (walking leg), which is greatly enlarged. In the lobsters and crabs, it is the first pereiopod that is much bigger than the others. There are 71 extant species currently recognised, divided into 12 genera. Two fossil species are also recognised, each belonging to a separate genus. The earliest fossil assigned to the Stenopodidea is Jilinicaris chinensis from the Late Cretaceous. [more]

Stenothoidae

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Stilipedidae

Stilipedidae is a family of amphipods, containing the following genera: [more]

Strahlaxiidae

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Stygiomysidae

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Stygocarididae

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Stylodactylidae

The family Stylodactylidae is a group of shrimps and the only representative of its superfamily (Stylodactyloidea). It contains the five genera , Neostylodactylus, Parastylodactylus, Stylodactyloides and Stylodactylus. [more]

Styloniscidae

Styloniscidae is a family of woodlice, including the following genera: [more]

Sundathelphusidae

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Symethidae

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Synaxidae

Furry lobsters (sometimes called coral lobsters) are small decapod crustaceans, closely related to the slipper lobsters and spiny lobsters. The antennae are not as enlarged as in spiny and slipper lobsters, and the body is covered in short hairs, hence the name furry lobster. Although previously considered a family in their own right (Synaxidae Bate, 1881), the furry lobsters were subsumed into the family Palinuridae in 1990, and molecular phylogenies support the inclusion of the furry lobsters in the family Palinuridae. There are two genera, with three species between them: [more]

Synopiidae

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Tainisopidae

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Talitridae

Talitridae is a family of amphipods. Commonly, many of the North American fresh water species of this family are called scuds. Terrestrial species are often referred to as landhoppers and beach dwellers are called sandhoppers or sand fleas. Marine amphipods are often washed up in the strandline, but die rapidly on drying out. Talitrids differ in being able to survive for a long time out of water; some Southern Hemisphere species are entirely terrestrial. [more]

Tanaellidae

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Tanaidae

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Tanzanapseudidae

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Tecticipitidae

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Temnophliantidae

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Tendosphaeridae

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Tetrasquillidae

Tetrasquillidae is a family of mantis shrimp containing eight genera: [more]

Thalassinidae

Thalassina anomala is a species of mud lobster found in the mangrove swamps of the Indian Ocean and western Pacific Ocean. Its nocturnal burrowing is important for the recycling of nutrients in the mangrove ecosystem, although it is sometimes considered a pest of fish and prawn farms. [more]

Thalassocarididae

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Thambematidae

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Thaumastochelidae

The family Thaumastochelidae contains five known species of deep-sea lobsters, three in the genus Thaumastocheles, and two in the genus Thaumastochelopsis. The fifth species was discovered in the ten?year Census of Marine Life. These creatures are distinguished from other clawed lobsters by their blindness (an adaptation to deep-sea life), and by their single elongated, spiny chela. The five species are as follows: [more]

Thaumatelsonidae

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Thaumatopsidae

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Thermosbaenidae

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Thiidae

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Thomassiniidae

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Titaniidae

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Trachelipodidae

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Trichodactylidae

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Trichoniscidae

Trichoniscidae are a family of isopods (woodlice), including the most abundant British woodlouse, Trichoniscus pusillus. [more]

Tridentellidae

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Tulearidae

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Tumidocarcinidae

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Turanoniscidae

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Tychidae

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Tylidae

Tylidae is a family of woodlice. It contains approximately 27 species, all but one in the genus , the other being Helleria brevicornis. Together with the family Ligiidae, Tylidae appears to have diverged early from the remaining woodlouse families. [more]

Tymolidae

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Typhlogammaridae

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Typhlotanaidae

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Upogebiidae

Upogebiidae is a family of mud shrimp in the order Decapoda. [more]

Uristidae

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Urohaustoriidae

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Urothoidae

Urothoidae is a family of small marine amphipod crustaceans. Members of the family are found worldwide and are mainly detrivores and interface grazers, though some are also facultative filter feeders. [more]

Valettidae

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Varunidae

Varunidae is a family of thoracotrematan crabs. The delimitation of this family, part of the taxonomically confusing Grapsoidea, is undergoing revision. For a long time, they were placed at the rank of subfamily in the Grapsidae, but they appear to be closest to and the Mictyridae, which are usually placed in the Ocypodoidea. It may thus be better to merge the latter superfamily with the Grapsoidea, retaining the latter name as it is older. [more]

Vermectiadidae

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Vibiliidae

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Vitjazianidae

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Whiteleggiidae

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Xanthidae

Xanthidae is a family of crabs known as mud crabs, pebble crabs or rubble crabs. They are often brightly colored and are poisonous, containing toxins which are not destroyed by cooking and for which no antidote is known. The toxins are similar to the tetrodotoxin and saxitoxin produced by puffer fish, and may be produced by bacteria in the genus Vibrio living in symbiosis with the crabs, mostly V. alginolyticus and V. parahaemolyticus. [more]

Xenarcturidae

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Xenosellidae

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Zobrachoidae

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More info about the Family Zobrachoidae may be found here.

Sources

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Last Revised: August 25, 2014
2014/08/25 13:10:36