Crustaceans are animals like lobsters, crabs, and crayfish. Crustaceans have two pairs of antennae, two pairs of maxillae, a pair of mandibles, which are like jaws, and biramous legs.
Crustaceans are arthropods of the mainly aquatic class Crustacea, typically having a carapace hardened with lime, and include lobsters, crabs, shrimps, woodlice, barnacles, cope, and water fleas. The...