Hypertext Webster Gateway: "Arthrostraca"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Arthrostraca \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.
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