Oligosarcus, Gunther, 1864

Ota, Renata Rúbia, Deprá, Gabriel de Carvalho, Graça, Weferson Júnio da & Pavanelli, Carla Simone, 2018, Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated, Neotropical Ichthyology 16 (2), pp. 1-111 : 33

Oligosarcus

1. Lateral line with 47 to 54 pored scales; head length contained 2.9 to 3.5 times in standard length; dentary the same size or shorter than upper jaw................ O. paranensis

1’. Lateral line with 36 to 40 pored scales; head length contained 3.7 to 3.8 in standard length; dentary much longer than upper jaw.............................................. O. pintoi