Crustaceans are a large group of organisms within the phylum Arthropoda. The vast majority of crustaceans are aquatic and live in either freshwater or marine ecosystems. Small crustacea and their larvae are a large constituent of plankton.

Familiar crustaceans include crabs, lobsters and shrimps. However, woodlice are also crustaceans.

A photograph of the Woodlouse, _Porcellio scaber_.

One of the most familiar crustaceans is the Woodlouse, Porcellio scaber.

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