Piabina argentea Reinhardt, 1867

Fig. 11

Body elongate; greatest body depth contained 3.8 to 4.3, caudal peduncle depth 9.2 to 11.1 times in SL; head length 3.5 to 4.1 and predorsal distance 1.9 to 2.1 in SL; snout length 3.2 to 3.7, horizontal orbital diameter 2.8 to 3.4, and least interorbital width 3.3 to 3.7 times in HL. Mouth subterminal; outer row of premaxilla with 2-3, median row with 2 and inner row with 4, dentary with 6-7 and maxilla with 2 or 3 teeth. Lateral line complete, with 37-39 pored scales; transverse series above lateral line with 5 scales above and below with 3-4 scale rows. Dorsal fin with 10, pectoral fin with 12-13, pelvic fin with 9, anal with 18-21, and caudal fin with 19 rays (Vari, Harold, 2001). Ground color silvery to pale yellow; black humeral spot, with irregular limits; dark-brown longitudinal band, from humeral spot to median caudal-fin rays. Hyaline fins (Graça, Pavanelli, 2007).

Maximum standard length. 74.0 mm (Graça, Pavanelli, 2007).

Distribution. Río de la Plata and rio São Francisco basins.