Juan Marcos Mirande, Gastón Aguilera & María de las Mercedes Azpelicueta, 2007, A new species of Astyanax (Characiformes: Characidae) from the endorheic Río Salí basin, Tucumán, northwestern Argentina., Zootaxa 1646, pp. 31-39: 31-32

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[[ Astyanax  ZBK  ]]

In recent years, several species of Astyanax  ZBK  with similar counts of scales (33-36 on lateral line, 6-7/5-6 transverse) and anal fin-rays (iv-v + 21-23) to those of A. eigenmanniorum  were described from eastern Brazil and northern Argentina (Almiron et al, 2002; Azpelicueta & Garcia, 2000; Azpelicueta et al. 2002a, 2002b, 2003; Casciotta et al., 2003; Casciotta & Almiron, 2004; Melo, 2001; Miquelarena et al., 2005; Miquelarena & Menni, 2005; Mirande et al., 2006). Several of these species, plus a few others, share the presence of gradually decreasing dentary teeth and variably expanded premaxillary teeth. This group of species is composed by A. giton Eigenmann  ZBK  and A. hastatus Myers  ZBK  from eastern Brazil, A. ojiara Azpelicueta & Garcia  ZBK  , A. troya Azpelicueta, Casciotta & Almiron  ZBK  , A. leonidas Azpelicueta, Casciotta & Almiron  ZBK  , A. pynandi Casciotta, Almiron, Bechara, Roux & Ruiz Diaz  ZBK  , A. ita Almiron, Azpelicueta & Casciotta  ZBK  from northeastern Argentina, and A. chico Casciotta & Almiron  ZBK  from northwestern Argentina. Additionally, all these species with the exceptions of A. hastatus  ZBK  and A. ita  ZBK  have hooks on anal, pelvic, pectoral, and/or dorsal, caudal fins.

The aim of this paper is to describe a new species from the endorheic Río Salí basin, northwestern Argentina, which shares with the mentioned species the gradually decreasing dentary teeth and expanded premaxillary teeth.

The genus Astyanax  ZBK  is currently diagnosed by a combination of several broadly distributed features among Characidae, and there are no studies supporting neither its monophyly nor the monophyly of some species complex within the genus. We assign this new species to genus Astyanax  ZBK  following its traditional definition (Eigenmann, 1917), considering that the new taxon shares some presumably apomorphic character states with species also assigned to this genus.