Around 65 species of crab occur in the waters of the British Isles.[1][Note 1] All are marine, with the exception of the introduced Chinese mitten crab, Eriocheir sinensis, which occurs in fresh and brackish water. They range in size from the deep-water species Paromola cuvieri,[3] which can reach a claw span of 1.2 metres (3 ft 11 in),[4] to the pea crab, which is only 4 mm (0.16 in) wide and lives inside mussel shells.
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