Brachaluteres jacksonianus, also known as the Southern Pygmy Leatherjacket, is a filefish endemic to Australia, found in temperate coastal waters and reefs from southern Queensland around to south-west Western Australia, including Tasmania.
The Southern Pygmy Leatherjacket has a very compressed body, which is almost circular. The lower surface is made up of a large ventral flap which can be raised and lowered. The abdomen is also expandable by inflating. The colouration of the Southern Pygmy Leatherjacket is highly variable, ranging from a pale yellow-brown to dark green with small spots or ocelli.
Fishes in the genus Brachaluteres occur in tropical marine waters of the Western Pacific.