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 Sternopygus macrurus (Bloch, Schneider, 1801) Fig. 17 Body elongated and compressed; greatest body depth contained 7.9 to 10.0 times in TL; head length 8.6 to 9.6, anal-fin base length 1.1 to 1.2, caudal filament length 2.6 to 4.9, preanal distance 6.8 to 7.6 and prepectoral distance 6.6 to 7.4 in LEA; snout length 2.6 to 3.0, horizontal orbital diameter 10.7 to 12.0 and least interorbital width 3.3 to 3.9 in HL. Mouth terminal. Pectoral fin with 15 or 17 and anal fin with 221-247 rays ( Campos-da-paz, 1997 ). Lateral line complete, with 193-269 pored scales. Transversal series above lateral line with 20-22 scale rows. Ground color and fin rays greyish-brown, inter-radial membranes hyaline; dark-brown humeral spot, occasionally inconspicuous ( Graça, Pavanelli, 2007 ). Maximum total length. 550.0 mm TL ( Graça, Pavanelli, 2007 ). Distribution. Amazon and río de La Plata basin.