Definitions for: Arthrostraca

Webster (1913) Definition: Ar*thros"tra*ca, n. pl. [NL., fr. Gr. 'a`rqron
joint + ? a shell.] (Zo["o]l.)
One of the larger divisions of Crustacea, so called because
the thorax and abdomen are both segmented; Tetradecapoda. It
includes the Amphipoda and Isopoda.