The largest group of marine arthropods are the crustaceans. Some of the crustaceans include a large range of shrimps, water fleas, barnacles, copepods, fish lice, ostracods, sandfleas, beach hoppers, isopods, amphipods, pill bugs, slaters, a range of prawns and shrimp, freshwater yabbies, rock lobsters, hermit crabs, half crabs, spider crabs, swimming crabs, normal crabs and shore crabs. These prawn, lobster and crab-like crustaceans form a class called Malocostraca.
