Oligosarcus

Oligosarcus is a genus of characins from freshwater habitats in northern Argentina, Paraguay, Uruguay, eastern Bolivia, and southern and central Brazil (South, Southeast and Central-West regions). They reach up to 31 cm in length and are predators that mainly feed on smaller fish.

Species
There are currently 22 recognized species in this genus:


 * Oligosarcus acutirostris Menezes, 1987
 * Oligosarcus amome Almirón, Casciotta, Piálek, Doubnerová & Říčan, 2015
 * Oligosarcus argenteus Günther, 1864
 * Oligosarcus bolivianus (Fowler, 1940)
 * Oligosarcus brevioris Menezes, 1987
 * Oligosarcus hepsetus (G. Cuvier, 1829)
 * Oligosarcus itau Mirande, Aguilera & Azpelicueta, 2011
 * Oligosarcus jacuiensis Menezes & A. C. Ribeiro, 2010
 * Oligosarcus jenynsii (Günther, 1864)
 * Oligosarcus longirostris Menezes & Géry, 1983
 * Oligosarcus macrolepis (Steindachner, 1877)
 * Oligosarcus menezesi Miquelarena & Protogino, 1996
 * Oligosarcus oligolepis (Steindachner, 1867)
 * Oligosarcus paranensis Menezes & Géry, 1983
 * Oligosarcus perdido A. C. Ribeiro, Cavallaro & Froehlich, 2007
 * Oligosarcus pintoi Amaral Campos, 1945
 * Oligosarcus planaltinae Menezes & Géry, 1983
 * Oligosarcus platensis (Messner, 1962)
 * Oligosarcus robustus Menezes, 1969
 * Oligosarcus schindleri Menezes & Géry, 1983
 * Oligosarcus solitarius Menezes, 1987
 * Oligosarcus varii Menezes & A. C. Ribeiro, 2015