The masked puffer (Arothron diadematus) is a pufferfish in the family Tetraodontidae.
Maximum length 30 cm, olive-green/grey with a black mask over the eyes and pectoral fins, mouth has a black border. Usually solitary but schools during mating period. Some authors believe this to be a variation of the species Arothron nigropunctatus.
Red Sea only.
Associated with coral reefs, from surface to 20m depth.
