This urchin is a strong purple color (juveniles may be largely pale green but will likely have some purple). It may be found intertidally or subtidally, but mainly on the open coast. Diameter of test not over 10 cm (usually 5 cm or smaller) and spines rarely over 2.5 cm long. Ambulacral pore pairs arranged in curving arcs of eight on upper side of test.
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