Crustaceans are mandibulate arthropods that are traditionally a part of the paraphyletic subphylum Crustacea. Crustaceans are mainly aquatic, including decapods, seed shrimps, branchiopods, fish lice,

Crustaceans may pass through a number of larval and immature stages between hatching from their eggs and reaching their adult form. Each of the stages is separated by a moult, in which the hard exoske