(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
‖prop. n. pl. [ NL., from Gr. malako`s soft + &unr_; shell of a testacean. ] (Zool.) A subclass of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca. [ 1913 Webster ]
‖n. pl. [ NL. See Thorax, and Ostracoid, a. ] (Zool.) An extensive division of Crustacea, having a dorsal shield or carapec&unr_; &unr_;&unr_;niting all, or nearly all, of the thoracic somites to the head. It includes the crabs, lobsters, shrimps, and similar species. [ 1913 Webster ]
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