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.