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malacostraca
CIDE DICTIONARY
malacostraca, prop. n. pl. [NL., from Gr. malako`s soft + shell of a testacean.].
A subclass of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca. [1913 Webster]
For further exploring for "malacostraca" in Webster Dictionary Online