A class of arthropods, mainly aquatic gill-breathing animals such as crabs, lobsters and shrimps, usually having two pairs antennae and often a hard carapace or shell.
two body regions; two pairs of antennae; 5 or more pairs of legs; primarily aquatic, few terrestrial.
Classes include crabs, shrimps, lobsters, barnacles, isopods etc. 44,000 described world species.
The Superclass Crustacea is a member of the Infraphylum Crustaceomorpha. Here is the complete "parentage" of Crustacea:
- Domain: Eukaryota
Whittaker & Margulis,1978 - eukaryotes
- Kingdom: Animalia
C. Linnaeus, 1758 - animals
- Subkingdom: Bilateria
(Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians
- Branch: Protostomia
Grobben, 1908 - protostomes
- Infrakingdom: Ecdysozoa A.M.A. Aguinaldo et al., 1997 ex T. Cavalier-Smith, 1998 - ecdysozoans
- Branch: Protostomia Grobben, 1908 - protostomes
- Subkingdom: Bilateria (Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians
- Kingdom: Animalia C. Linnaeus, 1758 - animals
The Superclass Crustacea is further organized into finer groupings including:
- Class (7): Anthozoa · Branchiopoda · Cephalocarida · Malacostraca · Maxillopoda · Ostracoda · Remipedia
Anthozoa is a class within the phylum Cnidaria that contains the sea anemones and corals. Unlike other cnidarians, anthozoans do not have a medusa stage in their development. Instead, they release sperm and eggs that form a planula, which attaches to some substrate on which the cnidarian grows. Some anthozoans can also reproduce asexually through budding. More than 6,100 species have been described. [more]
Branchiopoda is a class of crustaceans. It comprises fairy shrimp, clam shrimp, Cladocera, Notostraca and the Devonian Lepidocaris. They are mostly small, freshwater animals that feed on plankton and detritus, with the exception of the Cladocera, many of which are marine. [more]
Cephalocarida is a class inside the subphylum Crustacea that comprises only twelve shrimp-like benthic species. They were discovered in 1955 by , and are commonly referred to as horseshoe shrimps. They have been grouped together with the Remipedia in the Xenocarida. Although a second family, Lightiellidae, is sometimes used, all cephalocaridans are generally considered to belong in just one family: Hutchinsoniellidae. Even though there is no fossil record of cephalocaridans, most specialists believe them to be primitive among crustaceans. [more]
Malacostraca is the largest of the six classes of crustaceans, containing over 25,000 extant species, divided among 16 orders. Its members display a greater diversity of body forms than any other class of animals, and include crabs, lobsters, shrimp, krill, woodlice, scuds (Amphipoda), mantis shrimp and many other less familiar animals. They are abundant in all marine environments and have also colonised freshwater and terrestrial habitats. They are united by a common , comprising 20 body segments (rarely 21), divided into a head, thorax and abdomen. [more]
Maxillopoda is a diverse class of crustaceans including barnacles, copepods and a number of related animals. It does not appear to be a monophyletic group, and no single character unites all the members. [more]
Ostracoda is a class of the Crustacea, sometimes known as the seed shrimp because of their appearance. Some 65,000 species (13,000 of which are extant taxa) have been identified, grouped into several orders. [more]
Remipedia is a class of blind crustaceans found in coastal aquifers which contain saline groundwater, with populations identified in almost every ocean basin so far explored, including in Australia, the Caribbean Sea, the Atlantic Ocean. The first described remipede was the fossil Tesnusocaris goldichi (Lower Pennsylvanian), but, since 1979, at least seventeen living species have been identified with global distribution throughout the neo-tropical zone. [more]
At least 3 species and subspecies belong to the Class Remipedia.
More info about the Class Remipedia may be found here.
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