A new species of Astyanax (Characiformes: characidae) from the endorheic Rio Sali basin, Tucuman, northwestern Argentina

Astyanax puka, new species from the endorheic Rio SalR basin, is diagnosed by the following combination of characters: shallow body (33.5-39.8 % SL), 36-38 perforated scales in lateral line, 6/5 transverse scales, 9-10 gradually decreasing dentary teeth, distally expanded premaxillary teeth, one distally expanded maxillary tooth with 7-9 cusps, short upper-jaw length (34.5-37.8 % HL), short maxilla (20.7-23.3 % HL) expanded abruptly under maxillary tooth position, short postorbital distance (36.6-46.9 % HL), short distance between pelvic and anal-fin origins (17.1-20.6 % SL), 22-27 branched anal-fin rays, long caudal peduncle (13.3-16.5 % SL), bony hooks restricted to pelvic-fin rays 2 to 6 and anterior 6-13 branched anal-fin rays on mature males, and the presence of broad denticles on anterior, lateral, and posterior edges of first ceratobranchial gill rakers.