The Cephalocarida are a class in the subphylum Crustacea comprising only 12 benthic species. They were discovered in 1955 by Howard L. Sanders, 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. Though no fossil record of cephalocaridans has been found, most specialists believe them to be primitive among crustaceans.
From Wikipedia article at https://en.wikipedia.org/wiki/Cephalocarida, which is released under the Creative Commons Attribution-Share-Alike License 3.0.
|Taxonomy (GBIF,PBDB)||Life : Animalia : Arthropoda : Cephalocarida|
|Taxonomic Status (GBIF)||accepted|
|Taxon Size (PBDB)||3|
|Extant Size (PBDB)||1 (33%)|
|First Recorded Appearance||501 - 485 Ma|
|Ecospace Comments||ECOSPACE CODE: 322.|
|Primary Reference (PBDB)||J. W. Martin and G. E. Davis. 2001. An Updated Classification of the Recent Crustacea. Natural History Museum of Los Angeles County Science Series (39):1-124|
|Common Name(s)||Horseshoe Shrimp|
|Name||Status||Common Name(s)||Fossil Occurrences||Oldest||Youngest|
|accepted||No associated record in PBDB|
Unlinked PBDB sub-entries
|Not linked to GBIF||1||extinct||501 Ma|
|Year||Name and Author|
|2001||Cephalocarida Martin and Davis p. 58|