Apteronotus, Lacepede, 1800

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 : 54

Apteronotus

1. Body dark-brown, with two white transverse bars accross the tail, close to its extremity, the anterior broader, coincident with the posteriormost anal-fin rays, the posterior narrower, at the caudal-fin base; posterior margin of opercle white; and white stripe along the chin and the mid-dorsal line of head, frequently extending posterioly to about the middle of the mid-dorsal line of body................. 2

1’. Body entirely brown, with no white marks ................... 3

2. Anterior white transverse bar of the tail immaculate ..... ...................................................................... A. aff. albifrons

2’. Anterior white transverse bar of the tail marked with several irregular spots the same color as the body background.............................................. A. caudimaculosus

3. Dorsal scales large, transverse series above the lateral line with five to eight scale rows............................... A. ellisi

3’ Dorsal scales small, transverse series above the lateral line with 11 to 15 scale rows................................ A. acidops