Maximum shell length 6 cm, commonly to 4.5 cm. Attached to rocks in coral reef areas, or under stones on muddy bottoms. Littoral and sublittoral to a depth of 25 m. Collected for 1 in the n the Indo-West Pacific, trom East Arica, including Madagascar, the Red Sea and the Persian Gulf to Melanesia; north to Japan and south New Caledonia.