The Podocopa are a subclass of ostracod

Ostracod

Ostracoda is a class of the Crustacea, sometimes known as the seed shrimp because of their appearance. Some 65,000 species have been identified, grouped into several orders....

s. This subclass can be differentiated from the other subclass (Myodocopa

Myodocopa

Traditionally, the Myodocopa and Podocopa have been classified as subclasses within the class Ostracoda, although there is some question about how closely related the two groups actually are. The Myodocopa are defined by possession of a poorly-calcified carapace, and 8–9 articles in the exopod of...

) by the morphology of the second antenna

Antenna (biology)

Antennae in biology have historically been paired appendages used for sensing in arthropods. More recently, the term has also been applied to cilium structures present in most cell types of eukaryotes....

: the Podocopa have a relatively long endopod, whereas the Myodocopa have a relatively long exopod. The seventh limb of the Podocopa has a variety of forms or is absent, but is never an annulated worm-like limb (as seen in some Myodocopa). Within the Podocopa there are three orders: Platycopida, Podocopida

Podocopida

Podocopida is an order of ostracods in the subclass Podocopa. It is divided into five suborders – Bairdiocopina, Cypridocopina, Cytherocopina, Darwinulocopina and Sigilliocopina. It is the most diverse of the four orders of ostracods, and also has a rich fossil record....

 and Palaeocopida.

Families

• Bairdiidae G.O.Sars, 1887
• Bythocyprididae Maddocks, 1969
• Bythocytheridae Sars, 1866
• Cytherellidae
  Cytherellidae
  Cytherellidae is a family of ostracods, and is the only living family in the order, Platycopida, although the family Punciidae is also sometimes included. Members of the family have existed since the Jurassic...
  
   Sars, 1866
• Cytheridae Baird, 1850
• Cytherideidae Sars, 1925
• Cytheromatidae Elofson, 1939
• Cytheruridae Müller, 1894
• Entocytheridae Hoff, 1942
• Eucytheridae Puri, 1954
• Hemicytheridae Puri, 1953
• Kliellidae Schäfer, 1945
• Krithidae Mandelstam, 1958
• Leptocytheridae Hanai, 1957
• Loxoconchidae Sars, 1925
• Microcytheridae Klie, 1938
• Neocytherideidae Puri, 1957
• Paradoxostomatidae Brady & Norman, 1889
• Pectocytheridae Hanai, 1957
• Protocytheridae Ljubimova, 1956
• Psammocytheridae Klie, 1938
• Punciidae Hornibrook, 1949
• Schizocytheridae Howe, 1961
• Terrestricytheridae Schornikov, 1969
• Thaerocytheridae Hazel, 1967
• Trachyleberididae Sylvester-Bradley, 1948
• Xestoleberididae Sars, 1928