Astyanax puka is distinguished from the remaining species of the genus by the following combination of characters: shallow body (33.539.8% SL), 3638 perforated scales in lateral line, 6/5 transverse scales, 910 gradually decreasing dentary teeth, distally expanded premaxillary teeth, one distally expanded maxillary tooth with 79 cusps, short upper-jaw length (34.537.8% HL), short maxilla (20.723.3% HL)expanded abruptly under maxillary tooth position, short postorbital distance (36.646.9% HL), short pelvic to anal-fin origin distance (17.120.6% SL), 2227 branched anal-fin rays, long caudal peduncle (13.316.5% SL), bony hooks restricted to pelvic-fin rays 2 to 6 and anterior 613 branched anal-fin rays on mature males, and the presence of broad denticles on anterior, lateral, and posterior edges of first ceratobranchial gill rakers (Ref. 72407).
- Mirande, J.M., G. Aguilera and M. Azpelicueta 2007 A new species of Astyanax (Characiformes: Characidae) from the endorheic RÃo SalÃ basin, TucumÃ¡n, northwestern Argentina. Zootaxa 1646:31-39. (Ref. 72407) http://www.fishbase.org/references/FBRefSummary.php?id=72407&speccode=63575
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