The Myodocopa and Podocopa have been classified as subclasses within the class Ostracoda, but the Myodocopa are defined by its poorly calcified carapace, which is the upper section of the exoskeleton or shell in some animal groups.
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 89 articles in the exopod of the second antenna. A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. 
