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
leptostracanadjective or noun
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Origin and Etymology of leptostraca
New Latin, from lept- + -ostraca
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