Rhaphiodon vulpinus Spix, Agassiz, 1829

Fig. 12

Body deep; greatest depth contained 5.2 to 6.1 and caudal peduncle depth 16.1 to 17.3 times in SL; head length 4.8 to 5.3, predorsal distance 1.3 to 1.4 and caudal peduncle length 11.9 to 14.0 in SL; snout length 3.5 to 3.7, horizontal orbital diameter 4.6 to 4.7 and least interorbital width 6.1 to 6.2 in HL. Mouth superior, its cleft oblique; premaxilla with 14-16, dentary with 21-23 and maxilla with 15-17 teeth. Lateral line with 142-145 pored scales; transverse series above lateral line with 16-21 scale rows and below with 13-16 scale rows. Dorsal fin with 14, pectoral fin with 17 or 18, pelvic fin with 9, anal fin with 40-45, and caudal fin with 19 rays (Toledo-Piza, 2000). Ground color silvery. Pectoral, pelvic and anal fins yellowish; dorsal and caudal fins hyaline (Graça, Pavanelli, 2007).

Maximum standard length. 780.0 mm (Graça, Pavanelli, 2007).

Distribution. Río Orinoco, drainages of Guyana, Amazon and río de la Plata basins.