Sargocentron cornutum, the threespot squirrelfish, is a member of the family Holocentridae native to the western Pacific Ocean from Indonesia to the Great Barrier Reef. It lives in coral reefs and drop-offs between depths of . It is a nocturnal predator, feeding on crabs and shrimps by night and hiding under ledges or in caves by day. It can reach sizes of up to TL and has a venomous preopercle.