单词	Arthrostraca
释义	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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