Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated Author Ota, Renata Rúbia Author Deprá, Gabriel de Carvalho Author Graça, Weferson Júnio da Author Pavanelli, Carla Simone text Neotropical Ichthyology 2018 2018-06-11 16 2 1 111 journal article 10.1590/1982-0224-20170094 f68fe85c-2a4c-4625-b684-74f61398d6c2 1982-0224 3678395 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