entomostraca

Entomostraca

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.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
entomostraca

noun
in some older classifications includes the Branchiopoda and Copepoda and Ostracoda and Cirripedia; no longer in technical use 
WordNet® 3.0, © 2006 by Princeton University.
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