'subclass Malacostraca' definitions:
Definition of 'subclass Malacostraca'
(from WordNet)
noun
Largest subclass of Crustacea including most of the well- known marine, freshwater, and terrestrial crustaceans: crabs; lobsters; shrimps; sow bugs; beach flies [syn: Malacostraca, subclass Malacostraca]