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DescriptionA tiny oval, flattened sea urchin which lives in coarse gravel. When alive its colour is grey-green but on being hurt or damaged it turns bright green. The spines are short and give the animal a velvet texture. The anus is on the underside of the test posterior to the central mouth. Typically only 1cm. in length. Unique, the only member of the order Clypeasteroida in the British Isles.