new species:
Hoplias australis Oyakawa & Mattox, 2009

published in:
Oyakawa, O.T. & G.M.T. Mattox (2009):
Revision of the Neotropical trahiras of the Hoplias lacerdae species-group (Ostariophysi: Characiformes: Erythrinidae) with descriptions of two new species.
Neotropical Ichthyology 7 (2): 117-140

type locality:
Brazil, Santa Catarina State, Uruguay basin, rio das Antas, rio do Ouro drainage, on Formosa do Sul-Irati road, Formosa do Sul (26º38’55’’S 52º48’05’’W); Holotype MCP 40175 (220.0 mm SL)

distribution in Argentina:
Misiones province, Uruguay basin,
– arroyo Itacaruaré (27º53’S 55º17’W); Paratypes MCP 13318
– arroyo Santa Maria (27º56’S 55º27’W); Paratypes MCP 13320

abstract (from publication):
Hoplias lacerdae was originally described from the rio Ribeira de Iguape, Iporanga, São Paulo State. The Hoplias lacerdae group is defined as containing generally large trahiras with the medial margins of dentaries running parallel to each other and lacking teeth on the basihyal compared to the H. malabaricus group in which the medial margins of the dentaries converge towards the mandibular symphysis and which have teeth on the basihyal. A taxonomic revision of the group based on meristic and morphometric data identified five distinct species: H. lacerdae distributed in the rio Ribeira de Iguape and rio Uruguai; H. intermedius from the rio São Francisco, upper rio Paraná basin, and rio Doce; H. brasiliensis from rivers of the Atlantic Coastal drainage from the rio Paraguaçu to the rio Jequitinhonha; H. australis new species, endemic to the rio Uruguai; and H. curupira new species present in northern South America, including the rios Negro, Trombetas, Tapajós, Xingu, Tocantins and Capim in the Amazon basin, upper rio Orinoco near the rio Casiquiare (Venezuela), and coastal rivers of Guyana and Suriname. A lectotype for Hoplias intermedius and a neotype for H. brasiliensis are designated.

distribution (from publication):
Throughout rio Uruguay basin, including its tributary rio Negro.