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 Hypostomus commersoni Valenciennes, 1836 Fig. 23 Body deep; greatest body depth contained 4.0 to 4.4 and caudal peduncle depth 9.0 to 10.5 times in SL; head length 3.0 to 3.3, predorsal distance 2.4 to 2.8, dorsal-fin spine length 2.6 to 3.4, pectoral-fin spine length 3.1 to 3.6, adipose-fin spine length 13.5 to 19.0 and caudal peduncle length 3.0 to 3.5 in SL; snout length 1.6 to 1.8, horizontal orbital diameter 6.7 to 9.5 and least interorbital width 2.4 to 2.8 in HL. Mouth inferior; premaxilla with 22-45 and dentary with 22-48 teeth. Mid-lateral series with 28-0, predorsal series with 3, and dorsal-fin base series with 8-10 plates. Dorsal fin with I,7, pectoral fin with I,6, pelvic fin with i,5 and anal fin with 6 rays. Ground color brown; black spots on body, smaller on head. Brown fins with black spots. Maximum standard length. 270.0 mm ( Graça, Pavanelli, 2007 ). Distribution. Río Paraná basin and Laguna dos Patos drainage. Remarks. Hypostomus commersoni is a non-native species from the upper rio Paraná , and its occurrence can be associated with the filling of the Itaipu Reservoir and the consequent inundation of the Sete Quedas Falls.