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 Gymnotus sylvius Albert, Fernandes-Matioli, 1999 Fig. 16 Body elongated and compressed; greatest depth contained 7.0 to 9.3 times in TL; head length 7.1 to 8.2, anal-fin base length 1.2 in LEA; snout length 3.0 to 3.3, horizontal orbital diameter 12,8 to 14.0 and least interorbital width 2.6 to 2.7 in HL. Mouth superior, dentary prognathous. Pectoral fin with 15 or 16 rays and anal fin with 220-228 rays; transverse series above lateral line with 8 or 9 scale rows ( Albert et al. , 1999 ). Ground color pale brown; body with light-beige transverse bars alternating with dark-brown transverse bars; light-beige bars wider than dark-brown bars. Anal fin with posterior portion light-beige ( Graça, Pavanelli, 2007 ). Maximum total length. 360.0 mm ( Graça, Pavanelli, 2007 ). Distribution. Rio Ribeira de Iguape, rio Paraíba do Sul and rio Pardo basins.