SINCE 1828
Arthrostraca
plural noun
Ar·thros·tra·ca
| \ ärˈthrästrəkə\
Definition of Arthrostraca
in some classifications
: a division of Crustacea comprising the orders Amphipoda, Isopoda, and usually Tanaidacea in which both thorax and abdomen are segmented and there are seven pairs of thoracic appendages
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