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DescriptionA large brittle star with twisted arms which are conspicuously banded. The disc is covered with large plates separated by small granules and the dorsal surface of the arm has a single series of oval plates along its midline each surrounded by a ring of smaller plates. There are 4-5 robust conical arm spines and a single tentacle scale. Disc 15mm. arms 4x disc diameter. Ophiactis balli is similar but smaller.