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