Astyanax lacustris (Lütken, 1875)

Ota, Renata Rúbia, Deprá, Gabriel de Carvalho, Graça, Weferson Júnio da & Pavanelli, Carla Simone, 2018, Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated, Neotropical Ichthyology 16 (2), pp. 1-111: 26-27

publication ID 10.1590/1982-0224-20170094


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Astyanax lacustris (Lütken, 1875)


Astyanax lacustris (Lütken, 1875)  

Fig. 7 View Fig

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.