Peces Criollos - Freshwater Fishes of Argentina Peces Criollos - Freshwater Fishes of Argentina
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Astyanax saguazu sp.nov.

new species:
Astyanax saguazu   Casciotta, Almirón & Azpelicueta, 2003

type locality:
Argentina, Province of Misiones, Río Uruguay basin, headwaters of Arroyo Once Vueltas (27°38’S 55°12’W); Holotype MLP 9603 (63 mm SL)

distribution in Argentina: 
- type locality
- Province of Misiones, Río Uruguay basin, Arroyo Shangay (27°29’S 54°40’W); Paratypes MLP 9604

published in:
Casciotta, J.R., A.E. Almirón & M. Azpelicueta (2003):
A new species of Astyanax from río Uruguay basin, Argentina (Characiformes: Characidae).
Ichthyological Explorations of Freshwaters 14 (4): 329-334

abstract (from publication):
Astyanax saguazu, new species, is distinguished by the following combination of characters: two or threemaxillary teeth, third or fourth tooth of outer premaxillary series inserted posteriorly to the rest, large eye (41-45 % HL), first anal-fin ray inserted anterior to last dorsal-fin ray, high number of anal-fin rays (iv-vi, 25-29), and 37-39 perforated scales in lateral series. The large eye and the presence of 25-29 branched anal-fin rays differentiate the species from other Astyanax living in southern South America.

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