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Cephalocarida
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Cephalocarida
Sanders, 1955
Order: Brachypoda
Birshteyn, 1960
Family: Hutchinsoniellidae
Sanders, 1955
Genera

Chiltonella
Hampsonellus
Hutchinsoniella
Lightiella
Sandersiella

Cephalocarida is a class inside the subphylum Crustacea that comprises only about nine shrimp-like benthic species. They were discovered in 1955, and are commonly referred to as horseshoe shrimps. 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.

Description and anatomy

These crustaceans are from 2 to 4 millimetres (0.079 to 0.16 in) in length, with an elongate body. They have a large head, the hind edge of which covers the first thoracic segment. They have no eyes, presumably because of their muddy natural habitat. The second pair of antennae is located behind the mouth; in all other crustaceans the antennae are in front of the mouth at the adult stage, and only their larvae have antennae that have the same location as adult cephalocaridans.[1]

The mouth is located behind the large upper lip, flanked by mandibles. The first pair of maxillae is very small, and the second pair has the same structure as the following thoracic legs: a large basal part, equipped with outgrowths on the inner side, used in locomotion, a forked inner branch and two outer lobes - referred to as the "pseudoepipod" and the "exopod". The structural and functional similarity between the maxillae and the legs may be a sign of primitive organization; the maxillae are not specialized, as they are in other crustaceans.[1]

The thorax consists of 10 segments, and the abdomen bears a telson but no other appendages.

Ecology

Cephalocaridans are found from the intertidal zone down to a depth of 1500 m, in all kinds of sediments. Cephalocaridans feed on marine detritus. To bring in food particles, they generate currents with the thoracic appendages like the branchiopods and the malacostracans. Food particles are then passed anteriorly along a ventral groove, leading to the mouthparts.[2]

References

  1. ^ a b Barnes, Robert D. (1982). Invertebrate Zoology. Philadephia, PA: Holt-Saunders International. p. 672. ISBN 0-03-056747-5.  
  2. ^ L. A. Zenkevich. The Animal Life (Zhizn' Zhivotnykh), Volume 2. Chapter 7 - Phylum Arthropoda.
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Wiktionary

Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

Contents

Translingual

Etymology

Proper noun

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Wikipedia

Cephalocarida

  1. a taxonomic class, within subphylum Crustacea - the horseshoe shrimps
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Wikispecies

See also

  • Brachypoda - the only order

Wikispecies

Up to date as of January 23, 2010

From Wikispecies

Taxonavigation

Main Page
Cladus: Eukaryota
Supergroup: Unikonta
Cladus: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Phylum: Arthropoda
Subphylum: Crustacea
Classis: Cephalocarida
Ordo: Brachypoda

Name

Cephalocarida

References

  • Sanders, H.L. 1955: The Cephalocarida, a new sub-class of Crustacea from Long Island Sound. Proceedings of the National Academy of Sciences, 41: 61-66.
  • Sanders, H.L. 1957: The Cephalocarida and crustacean phylogeny. Systematic zoology, 6: 112-128, 148.
  • Sanders, H.L. 1963: The Cephalocarida: functional morphology, larval development, comparative external anatomy. Memoirs of the Connecticut Academy of Arts and Sciences, 15: 1-80.

Vernacular Name

Ελληνικά: Κεφαλοκαρίδες
日本語: カシラエビ綱

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