Leptostraca
plural noun
Lep·tos·tra·ca
| \ lepˈtästrəkə\
Definition of Leptostraca
: a division of Malacostraca including the Phyllocarida, the Nebaliacea, and various fossil forms that are regarded as intermediate between the typical malacostracans and the lower crustaceans although classed among the former — see nebalia
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