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Crustaceans form a large, complex taxon of arthropods that includes such species as crabs, lobsters, crayfish, shrimps, prawns, krill, woodlice and barnacles. Some crustaceans are aquatic animals that are free-living, but some are terrestrial, some are parasitic and some are sessile. The group has an extensive record of fossils, reaching back to the Cambrian, which includes living fossils such as Triops cancriformis, which apparently lived unchanged since the Triassic era.

Some crustaceans are aquatic animals that are free-living, but some are terrestrial, some are parasitic and some are sessile. The group has an extensive record of fossils, reaching back to the Cambrian, which includes living fossils such as Triops cancriformis, which apparently lived unchanged since the Triassic era.

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