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nounlargest 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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Definition that contains malacostraca
- amphipod a kind of malacostracan crustacean
- schizopoda in former classifications a division of Malacostraca; superseded by the orders Mysidacea and Euphausiacea