subclass Malacostraca
subc·lass·ma·lacostraca
noun
1.
largest subclass of Crustacea including most of the well-known marine, freshwater, and terrestrial crustaceans: crabs; lobsters; shrimps; sow bugs; beach flies
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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.