\En`to*mos"tra*ca\, n. pl. [NL., fr. Gr. ? cut in
pieces + ? burnt clay, the hard shell of Testacea.]
(Zo["o]l.)
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}.