The Southern Blue Devil can be recognised by its colouration. It is greyish to blue or black with numerous small brilliant blue spots on the head and body. The anterior margin of the pelvic fins and the distal margins of the dorsal, anal and caudal fins are bright blue. Large adults sometimes have a blue ring low on the operculum. Juveniles have dark regions posteriorly on the dorsal, anal and caudal fins.
It grows to about 36 cm in length.
The Southern Blue Devil is a benthic species that lives in temperate inshore waters, usually on rocky reefs.
The species is endemic to Australia, occurring from the central coast of Victoria to south-western Western Australia.
It has also been called the Western Blue Devil.
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