Definition of Notostraca
: an order of small freshwater crustaceans (subclass Branchiopoda) having a shield-shaped carapace, sessile paired eyes, vestigial antennae, and 40 to 63 pairs of trunk appendages — see triops
notostracan\-kən\ adjective or noun
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Origin and Etymology of notostraca
New Latin, from 1not- + -ostraca
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