Arthrostraca

plural noun

Ar·​thros·​tra·​ca

ärˈthrästrəkə

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

Word History

Etymology

New Latin, from arthr- + -ostraca

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