malacostraca malacosoma disstria • Malacostraca · · · Info · Definitions · Characters · · malacostraca · · Text Latin · · Script 12 · · Length 5 · · Syllables Definitions · · · (noun) largest subclass of Crustacea including most of the well-known marine, freshwater, and terrestrial crustaceans: crabs; lobsters; shrimps; sow bugs; beach flies. Synonyms: Malacostraca, subclass Malacostraca. · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 l latin small letter l U+006C m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074