Indo-Pacific: Red Sea and East Africa to the Society Islands, north to the Ryukyu and the Ogasawara islands, south to northwestern Australia and New Caledonia; throughout Micronesia.

Variable but usually two large black spots are obvious; body diameter to about 14 mm (Ref. 48635). Anterior nostrils included in continuous free labial flange. Pectoral fins minute. Total vertebrae 163-177, anal origin below vertebra 59-66.

Often found on sandy slopes below 15 m; withdraws into its burrow when approached. Usually in colonies containing up to several hundred individuals.