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Entomostraca is a historical subclass of , no longer in technical use. It was originally considered one of the two major lineages of crustaceans (the other being the class Malacostraca), combining all other classes—Branchiopoda, Cephalocarida, , and the obsolete Maxillopoda. The Ostracoda have the body enclosed in a bivalve shell-covering, and are normally unsegmented. The Branchiopoda have a very variable number of body-segments, with or without a shield, simple or bivalved, and some of the post-oral normally branchial. The Copepoda normally have a segmented body, not enclosed in a bi-valved shell-covering, fewer than twelve segments, the limbs not branchial.
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