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Crustaceans are a very diverse group of invertebrate animals which includes active animals such as the crabs, lobsters, shrimp, krill, copepods, amphipods and more sessile creatures like barnacles.
All crustaceans have:
A hard, but flexible exoskeleton or shell
Two pairs of antennae
A pair of mandibles (which are appendages used for eating)
Two pairs of maxillae on their heads (additional mouth parts located after the mandibles)
Two compound eyes, often on stalks
Segmented bodies with appendages on each body segment
Gills
Crustaceans are diverse in form and live around the world in a variety of habitats - even on land. Marine crustaceans live anywhere from shallow intertidal areas to the deep sea.