Scorpaenopsis diabolus, the false stonefish or the devil scorpionfish, is a carnivorous ray-finned fish in the order Scorpaeniformes, the scorpionfishes and flatheads. It has venomous spines and lives in the tropical Indianand Pacific Oceans. It is a bottom-dwelling predator that relies on its camouflage to catch passing prey. The false stonefish has a broad head with a wide mouth, a humped back, and a tapering body, and can reach 30 cm (12 in) in length. Its dorsal fin has 12 venomous spines and eight to 10 soft rays. The anal fin has three spines and five to six soft rays. The skin is rough with low conical projections, spines, and tassels. The colouring is a combination of mottled grey and white with reddish-brown blotches and the fish is well-camouflaged among stones and corals. The inner sides of the broad pectoral fins have orange, black, and white blotches and the fins can be “flashed” as a warning. This fish closely resembles the reef stonefish (Synanceia verrucosa).