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 Catathyridium jenynsii (Günther, 1862) Fig. 32 Body deep; greatest body depth contained 1.5 to 1.8, caudal peduncle depth 4.1 to 6.0 and head depth 2.8 to 3.4 times in SL; caudal peduncle depth 2.7 to 4.0 in body depth; snout length 2.8 to 4.0, horizontal orbital diameter 8.7 to 15.9 and least interorbital width 6.1 to 11.8 in HL. Mouth terminal; premaxilla and dentary with several small conical teeth. Lateral line with 70-85 pored scales. Dorsal fin with 55-60, pelvic fin with 5 and anal fin with 40-44 rays. Ground color brownish; right side of body with dark-brown irregular spots; five or six dark-brown transverse stripes; left side of body with no pigmentation. Brown fins with dark-brown spots ( Graça, Pavanelli, 2007 ). Maximum standard length. 256.0 mm ( Graça, Pavanelli, 2007 ). Distribution. Rio Paraná and rio Uruguay basins. Remarks. Catathyridium jenynsii 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.