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 Acestrorhynchus pantaneiro Menezes, 1992 Fig. 3 Body elongated; greatest depth contained 3.6 to 4.8 and caudal peduncle depth 12.1 to 14.9 times in SL; head length 3.0 to 3.6, predorsal distance 1.5 to 1.8 and caudal peduncle length 9.8 to 13.1 in SL; snout length 2.8 to 3.3, horizontal orbital diameter 3.5 to 5.0 and least interorbital width 3.5 to 4.6 in HL. Mouth terminal; outer row of premaxilla with 13- 16 and inner row with 10-20, and maxilla with 16-39 teeth. Lateral line complete, with 93-108 pored scales; transverse series above lateral line with 26-30 scale rows and below with 15-17 scale rows. Dorsal fin with 11, pectoral fin with 14-18, pelvic fin with 8, anal fin with 23-27, and caudal fin with 19 rays. Ground color silvery to yellowish; black rounded humeral blotch; black oval, horizontally elongated, blotch on caudal-fin base, extending to median caudal-fin rays. Yellowish fins; anal and pectoral fin with distal margins black ( Graça, Pavanelli, 2007 ). Maximum standard length. 180.0 mm ( Graça, Pavanelli, 2007 ). Distribution. Río de la Plata and rio Mamoré basins. Remarks. Acestrorhynchus pantaneiro is a non-native species from the upper rio Paraná basin, and its recent occurrence can be associated with the functioning of the Canal da Piracema, a fish ladder that connects the region downstream from the Itaipu Dam to the region upstream from the dam ( Graça, Pavanelli, 2007 ).