Halocyprida

The Halocyprida is one of the two orders within the Myodocopa, in turn a subclass of the ostracods. Like their relatives in the order Myodocopida, they have a long exopod on the second antenna. However, unlike myodocopids, their fifth appendage is leg-like rather than modified for feeding, their seventh limb is reduced or absent, and they have no lateral eyes. The group is primarily planktonic. There are two suborders: Halocypridina and Cladocopina.

Halocypridae is a family of ostracods in the order Halocyprida. Some members are bioluminescent, such as Conchoecia pseudodiscophora, and are believed to use coelenterazine and a coelenterazine luciferase, rather than vargulin.

species of crustacean

Thaumatocyprididae is a family of ostracods in the order Halocyprida which contains seven genera and one subfamily. It first appeared in the Lopingian Epoch, 259.9 million years ago.

Spelaeoecia is a genus of crustaceans in the family Thaumatocyprididae. One species, the Bermudan endemic S. bermudensis, is listed as critically endangered on the IUCN Red List. It contains the following species: Spelaeoecia barri Kornicker in Kornicker & Barr, 1997 Spelaeoecia bermudensis Angel & Iliffe, 1987 Spelaeoecia capax Kornicker in Kornicker, Yager & Williams, 1990 Spelaeoecia cubensis Kornicker & Yager, 1996 Spelaeoecia hox Kornicker, Iliffe & Harrison-Nelson, 2007 Spelaeoecia jamaicensis Kornicker & Iliffe, 1992 Spelaeoecia mayan Kornicker & Iliffe, 1998 Spelaeoecia parkeri Kornick

Polycopidae is a family of marine ostracods. Its members are related to animals in the suborder Halocypridina, but are sufficiently distinct to be placed in the sub-order Cladocopina. There is even some speculation that a separate order may be warranted. The genera in the family differ from the other suborder, Halocypridina, in several features: the central adductor muscle scars are in a triangular (3 scars) or half-rosette (15 scars) pattern, they lack sixth and seventh limbs, and the maxilla (=fourth limb) has both an exopod and endopod (the maxilla in the Halocypridina lacks an exopod).

Discoconchoecia is a genus of ostracods in the subfamily Conchoeciinae.

Conchoecia is a genus of ostracods in the subfamily Conchoeciinae.

species of crustacean

Halocypridina is a suborder of seed shrimp in the order Halocyprida. Ostracods of this group often have a dorsoposterior spine on the carapace. The adductor muscle scars show various patterns, in contrast to those of the Cladocopina, which are in a triangular pattern (three scars) or a half-rosette (15 scars). A sixth limb is present (absent in Cladocopina). The group is divided into the Halocypridae and the Thaumatocyprididae.

Polycopoidea is a superfamily of marine ostracods. It is the only superfamily in the suborder Cladocopina.