Calotomus spinidens
Calotomus spinidens, the spinytooth parrotfish, is a species of marine ray-finned fish, a parrotfish, in the family Scaridae. It is found in the Indo-Pacific from East Africa to Tonga and the Marshall Islands where it is found in seagrass and weaweedbeds located in coastal bays or deep lagoons.
The species is diandric which includes primary males and larger more aggressive secondary males, with smaller primary males sometimes participating in spawning by interfering with pair spawnings of the larger secondary males.