Crustacea dafination?

Answer:a large group of mainly aquatic arthropods which include crabs, lobsters, shrimps, woodlice, barnacles, and many minute forms. They are very diverse, but most have four or more pairs of limbs and several other appendages

A large group of mainly aquatic arthropods that include crabs, lobsters, shrimps, wood lice, barnacles, and many minute forms.