Fig. 7

Body deep; greatest depth contained 1.8 to 2.9 and caudal peduncle depth 6.6 to 10.1 times in SL; head length 3.0 to 4.4, predorsal distance 1.6 to 2.4 and caudal peduncle length 7.8 to 8.4 in SL; snout length 3.2 to 4.1, horizontal orbital diameter 2.3 to 4.7 and least interorbital width 1.9 to 3.3 in HL. Mouth terminal; inner row of premaxilla with 5 teeth, outer with 4 or 5, dentary with 8-16, and no maxillary teeth. Lateral line complete, with 33-41 pored scales; transverse series above lateral line with 6 to 8 scale rows and below with 4-8 scale rows. Dorsal fin with 12, pectoral fin with 12 or 13, pelvic fin with 8 or 9, anal fin with 22-34, and caudal fin with 19. Ground color silvery; one black rounded humeral blotch followed by another vertically elongated humeral blotch; silvery longitudinal band on flank (brown or grey in fixed specimens), from humeral blotch to median caudal-fin rays, larger on caudal peduncle, forming oval-shaped, horizontally elongated, blotch. Yellowish fins (Graça, Pavanelli, 2007).

Maximum standard length. 129.2 mm (Graça, Pavanelli, 2007).

Distribution. Río de la Plata basin, Laguna dos Patos and rio Tramandaí drainages, rio São Francisco (Lucena, Soares, 2016) and, according to Garutti, Langeani (2009), rio Tocantins-Araguaia basins.

Remarks. Astyanax lacustris was identified as A. altiparanae by Graça, Pavanelli (2007). Lucena, Soares (2016), in a revisionary study of some species in the Astyanax bimaculatus (Linnaeus, 1758) group from Southern Neotropical river basins, proposed the new synonym.