Southern Wolffish

Hoplias australis has its dorsal fin supported by between 12 and 14 soft rays while the anal fin has between 9 and 11 soft rays. There is a laterosensory canal along the lower surface of the dentary which consistently has 5 pores. The anterior profile of the head is rounded when viewed from the side. There are between 40 and 45 scales in the lateral line. The body of this fish is elongated in shape. This species has reaches a standard length of 44 cm (17 in).

Hoplias australis is found in the southern part of South America in the Uruguay River system and its tributary the Rio Negro in Corrientes and Misiones provinces of Argentina, Santa Catarina State in Brazil and in Uruguay. little is known about its ecology and behaviour.

== References ==

Hoplias australis is a species within the genus Hoplias, a word derived from the Greek hoplon, which means "shield" or "armour", an allusion to the armour created by the enlarged cranial bones and large teeth of these fishes. The specific name, australis, means "southern", a reference to this fish being one of the southernmost species in the genus Hoplias.