Bibliografía Argentina del género Prochilodus (Pisces: Curimatidae).

This compilation groups the bibliographic references up to the year 1992 of the species of the genus Prochilodus present in Argentina. A list of the species of the genus inhabiting del Plata basin is presented.

Nota acerca de una especimen del género Potamotrygon (Chondrichthyes, Potamotrygonidae).

Its deal with the study of a sample of "river ray" of the Potamotrygonidae family procured in the Colastiné river (Midle Paraná)showing an external morphology relating it closely to two species of said family: Potamotrygon falkneri Castex y Maciel, 1963 and P. menchacai Martínez Achembach, 1965.