Entomostraca /(?)/

En·to·mos·tra·ca

Entomostraca

n. pl.
  1. 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. (Zoöl.)