Genus Threpterius

A monotypic genus confined to southern Australia. Features: head very depressed, dorsal profile strongly concave above eyes, nape distinctly convex; snout short, broadly pointed; mouth rather large, reaching past vertical through centre of eye; small sharp teeth in single row laterally on jaws, several rows near symphysis, single row of teeth on vomer; scales covering posterior part of head; base of soft part of dorsal fin nearly as long as spinous portion, membranes behind spines deeply incised, each spine usually with small flesh flag near tip; anal fin truncate, below anterior half of soft dorsal; caudal fin slightly rounded; ventral fins based just below and behind pectoral fin bases.