Learn how to say Crustaceans correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word crustacean:
any arthropod of the mainly aquatic class Crustacea, typically having a carapace hardened with lime and including the lobsters, crabs, shrimps, woodlice, barnacles, copepods, and water fleas
of, relating to, or belonging to the Crustacea
C19: from New Latin crūstāceus hard-shelled, from Latin crūsta shell, crust