Malacostraca
  軟甲亞綱
  Mal·a·cos·tra·ca prop. n. pl.  Zool. A subclass of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca.
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  Malacostraca
       n : largest subclass of Crustacea including most of the
           well-known marine, freshwater, and terrestrial
           crustaceans: crabs; lobsters; shrimps; sow bugs; beach
           flies [syn: subclass Malacostraca]