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 ternetzi (Boulenger, 1895) Fig. 24 Body deep; greatest body depth contained 4.2 to 4.7 and caudal peduncle depth 7.6 to 8.2 times in SL; head length 2.8 to 3.0, predorsal distance 2.2 to 2.4, dorsal-fin spine length 2.6 to 3.5, pectoral-fin spine length 3.0 to 3.3, adipose-fin spine length 9.2 to 10.3 and caudal peduncle length 3.1 to 3.3 in SL; snout length 1.6 to 1.8, horizontal orbital diameter 6.3 to 6.5 and least interorbital width 2.6 to 3.1 in HL. Mouth inferior; premaxilla with 59-127 and dentary with 60-126 teeth. Mid-lateral series with 25-27, predorsal series with 3 or 4, and dorsal-fin base series with 8 plates. Dorsal fin with I,7, pectoral fin with I,6, pelvic fin with i,5 and anal fin with 6 rays. Ground color light-beige, with dark-brown spots and/ or dark-brown vermiculate pattern, slightly conspicuous. Brown fins, sometimes with dark-brown spots. Maximum standard length. 296.0 mm ( Graça, Pavanelli, 2007 ). Distribution. Río Paraguay , middle río Paraná and río Uruguay basins. Remarks. Hypostomus ternetzi 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.