''Oligosarcus'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of characins from freshwater habitats in northern

Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...

Paraguay Paraguay, officially the Republic of Paraguay, is a landlocked country in South America. It is bordered by Argentina to the Argentina–Paraguay border, south and southwest, Brazil to the Brazil–Paraguay border, east and northeast, and Boli ...

Uruguay Uruguay, officially the Oriental Republic of Uruguay, is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast, while bordering the Río de la Plata to the south and the A ...

, eastern

Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...

, and southern and central Brazil ( South, Southeast and Central-West regions). They reach up to 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, 2015Almirón, A., Casciotta, J., Piálek, L., Doubnerová, K. & Říčan, O. (2015): ''Oligosarcus amome'' (Ostariophysi: Characidae), a new species from the río Uruguay basin, Misiones, Argentina. ''Zootaxa, 3915 (4): 581–590.'' * '' 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 ''Oligosarcus'' is a genus of characins from freshwater habitats in northern Argentina, Paraguay, Uruguay, eastern Bolivia, and southern and central Brazil (South Region, Brazil, South, Southeast Region, Brazil, Southeast and Central-West Region ...

'' 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, 2015Menezes, N.A. & Ribeiro, A.C. (2015): A new species of the lowland ''Oligosarcus'' Günther species group (Teleostei: Ostariophysi: Characidae). ''Neotropical Ichthyology, 13 (3): 541-546.''

References

Rhoadsiini Taxa named by Albert Günther Fish of South America {{Characidae-stub