Cephalocarida

The Cephalocarida (from Ancient Greek κεφαλή (kephalḗ), meaning "head", and καρίς (karís), meaning "shrimp") are a class in the subphylum Crustacea comprising only 12 species. Both the nauplii and the adults are benthic. They were discovered in 1955 by Howard L. Sanders, and are commonly referred to as horseshoe shrimp. 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. Fossil records of cephalocaridans have been found in the Ordovician Castle Bank site.

==Taxonomy== Class Cephalocarida Sanders 1955 Order Brachypoda Birshteyn 1960 Family Hutchinsoniellidae Sanders 1955 Genus Chiltoniella Knox & Fenwick 1977 Chiltoniella elongata Knox & Fenwick 1977 Genus Hampsonellus Hessler & Wakabara 2000 Hampsonellus brasiliensis Hessler & Wakabara 2000 Genus Hutchinsoniella Sanders 1955 Hutchinsoniella macracantha Sanders 1955 Genus Lightiella Jones 1961 Lightiella floridana McLaughlin 1976 Lightiella incisa Gooding 1963 Lightiella magdalenina Carcupino et al. 2006 Lightiella monniotae Cals & Delamare Deboutteville 1970 Lightiella serendipita Jones 1961 Genus Sandersiella Shiino 1965 Sandersiella acuminata Shiino 1965 Sandersiella bathyalis Hessler & Sanders 1973 Sandersiella calmani Hessler & Sanders 1973 Sandersiella kikuchii Shimomura & Akiyama 2008