prop. n. p | 1. | (Zool.) A subclass of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca. |
Noun | 1. | Malacostraca - largest subclass of Crustacea including most of the well-known marine, freshwater, and terrestrial crustaceans: crabs; lobsters; shrimps; sow bugs; beach flies Synonyms: subclass Malacostraca |