Myodocopa

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Myodocopida

Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Crustacea
Class:	Ostracoda
Subclass:	Myodocopa Sars, 1866

Orders

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 the second antenna. (Kornicker, 1993). The ventral margin of the carapace is not concave, and the valves do not overlap to a great extent (Horne, 2002).

Although the carapace of myodocopans is poorly-calcified, some fossils are known for the group. (In contrast, thousands of fossil species are named for the Podocopa). Of particular interest are those fossils for which the internal body parts (and not just the carapace) are preserved. This provides a lot more information about the likely relatives to the fossil taxa, including relatives still alive today. Two recent fossils of much interest have been found from Silurian deposits (dated at 425 million years ago). These fossils have well preserved internal body parts (Siveter et al 2003, Siveter et al 2007).

[edit] References

An Updated Classification of the Recent Crustacea. Martin, J. W. & Davis, G. E., 2001. 132 pg. pdf file.
Horne, D. J., A. C. Cohen, & K. Martens. 2002. Taxonomy, morphhology and biology of Quaternary and living Ostracoda. AGV Geophysical Monograph Series. The Ostracoda: Applications in Quaternary Research. 131: 5–36.
Kornicker, L. S. 1993. Antarctic and Subantarctic Myodocopina (Ostracoda). Koeltz Scientific Books,, Koenigstein, Germany ; Champaign, Ill.
Siveter, David J., Sutton, M., Briggs, D.E.G. & Siveter, Derek J. 2003. An ostracode crustacean with soft parts from the Lower Silurian. Science, 302, 1747-1751.
Siveter, David J., Siveter, Derek J., Sutton, M.D. and Briggs, D.E.G. 2007 Brood care in a Silurian ostracod. Proceedings of the Royal Society, London B 274, 465-469.