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Definition of Crustacea, crustaceans:
A group of freshwater and saltwater invertebrates with jointed legs and a hard shell of chitin.
This is the common definition for Crustacea, crustaceans, other definitions can be discussed in the article


Subphylum of arthropods, considered as a class in older classifications. They are mainly aquatic, gill-breathing animals, such as crabs, lobsters and shrimps. The body is divided into a head bearing five pairs of appendages (two pairs of pre-oral sensory feelers and three pairs of post-oral feeding appendages) and a trunk and abdomen bearing a variable number of often biramous appendages wich serve as walking legs and gills. Crustacea often have a hard carapace of shell.[1]


  1. Lawrence, E. (2005). Henderson’s dictionary of biology. Pearson Education Limited, 13th ed., Harlow. 748 p.