Steindachnerina brevipinna (Eigenmann, Eigenmann, 1889)

Fig. 12

Body elongated; greatest body depth contained 2.6 to 3.2 and caudal peduncle depth 6.6 to 8.3 times in SL; head length 3.1 to 3.7, predorsal distance 1.9 to 2.1 and caudal peduncle length 8.3 to 9.3 in SL; snout length 2.9 to 3.7, horizontal orbital diameter 2.8 to 3.6 and least interorbital width 2.2 to 2.6 in HL. Mouth terminal; premaxilla, dentary and maxilla without teeth in adults. Lateral line with 33-37 pored scales; transverse series above lateral line with 5½- 6½ scale rows and below with 4½-5½ scale rows. Dorsal fin with 10-12, pectoral fin with 11-14, pelvic fin with 9, anal fin with 9 or 10 and caudal fin with 19 rays (Vari, 1991). Ground color silvery; black conspicuous longitudinal stripe along lateral line to distal margin of median caudalfin rays, larger on caudal peduncle. Yellowish fins; dorsal fin black blotch on the base of median rays, sometimes little conspicuous (Graça, Pavanelli, 2007).

Maximum standard length. 160.0 mm (Graça, Pavanelli, 2007).

Distribution. Río de la Plata basin.

Remarks. Steindachnerina brevipinna is a non-native species from the upper rio Paraná, and its occurrence can be associated with the filling of the Itaipu Reservoir and the consequent inundation of the Sete Quedas Falls.