La posición sistemática de “Trionyx argentina” Ameghino, 1899 (Chelonii: Trionychidae)

Abstract

In this note the systematic position of the species "Trionyx" argentina Ameghino, 1899 is analyzed, which comes from the Lower Paleocene of Patagonia. The review of the holotypical material of T argentina permit to exclude it from the family Trionychidae (and consecuently from the genus Trionyx), and to include it within Chelidae. In the same way, it shows several common features with the living genus Phrynops. Additionaly, a supposed Trionychidae from Colombia, is here considered as a posible Chelidae or Araripemyidae.