Trimma unisquamis (Gosline, 1959)
This tiny goby attains only about 1 in. and lives under ledges and in caves. Rarely seen or photographed, it occurs from Hawaii to the Cocos Keeling Islands in the Eastern Indian Ocean. The photo above was taken at Pupukea, O`ahu, at a depth of 15 ft. More information on this species can be found in Reef and Shore Fishes of the Hawaiian Islands by Dr. John E. Randall.