Entomostraca

‖En′to‐mos″tra‐ca (?), n. pl.(Zoöl.) One of the subclasses of Crustacea, including a large number of species, many of them minute. The group embraces several orders; as the Phyllopoda, Ostracoda, Copepoda, and Pectostraca. See Copepoda, Phyllopoda, and Cladocera.