Otothyropsis, Ribeiro, Carvalho & Melo, 2005

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 : 79

Otothyropsis

1. Caudal fin with dark-brown spots, sometimes forming irregular transverse stripes; ventral caudal-fin lobe without a light-beige irregular blotch......................... O. marapoama

1’. Caudal fin without dark-brown spots; ventral caudalfin lobe dark-brown, with a light-beige irregular blotch.... ............................................................................ O. polyodon