first record from Argentina:
Astyanax xiru Lucena, Castro & Bertaco, 2013

published in:
Casciotta, J., A. Almirón, Š. Říčanová, K. Dragová, L. Piálek & O. Říčan (2016):
First record of Astyanax xiru Lucena, Castro & Bertaco, 2013 (Characiformes: Characidae) from the río Uruguay basin of Argentina.
Ichthyological Contributions of PecesCriollos 42: 1-4

abstract (from publication):
Astyanax xiru is registered for the first time from freshwaters of Argentina in the province of Misiones. This species was found in the Middle río Uruguay basin: arroyo Yaboti-Mini and its affluent arroyo San Juan; arroyos Fortaleza, Oveja Negra and Trigueño, tributaries of the arroyo Yaboti-Guazú; and río Pepirí-Guazú, the only stream in Argentinean territory included in the Upper Uruguay freshwater ecoregion.