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 Oligosarcus paranensis Menezes, Géry, 1983 Fig. 9 Body elongate; greatest depth contained 2.9 to 3.7 and caudal peduncle depth 7.8 to 8.6 times in SL; head length 2.9 to 3.5, predorsal distance 1.7 to 1.9 and caudal peduncle length 8.7 to 9.4 in SL; snout length 3.5 to 4.5, horizontal orbital diameter 2.6 to 4.3 and least interorbital width 3.8 to 5.6 in HL. Mouth terminal; premaxilla with 4-7 teeth, dentary with 11-21, and maxilla with 18-35 teeth. Lateral line complete, with 47-54 pored scales; transverse series above lateral line with 9-10 scale rows and below with 6-8 scale rows. Dorsal fin with 12, pectoral fin with 12-16, pelvic fin with 8-9, anal fin with 20-27, and caudal fin with 19 rays ( Menezes, Géry, 1983 ). Ground color silvery; black humeral spot, vertically elongate; silvery longitudinal stripe on flank (brown or grey in preserved specimens), from humeral spot to median caudal-fin rays. Yellowish fins ( Graça, Pavanelli, 2007 ). Maximum standard length. 100 mm ( Graça, Pavanelli, 2007 ). Distribution. Upper rio Paraná basin.