Arthrostraca

• (n. pl.) One of the larger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda.
Found on http://thinkexist.com/dictionary/meaning/arthrostraca/

Arthrostraca

Ar·thros'tra·ca noun plural [ New Latin , from Greek 'a`rqron joint + ... a shell.] (Zoology) One of the larger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda.
Found on http://www.encyclo.co.uk/webster/A/125
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