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malacostracous
Variant of malacostracan
adjective
of a large class (Malacostraca) of highly evolved crustaceans typically consisting of 19 segments, including the decapods, krill, and isopods
also malacostracous
noun
such a crustacean
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.