Species: ferox BONAPARTE, 1990
Etymology:

Holotype: MACN-RN 161

Locality: West slope of Cerro Cuadrado, Arroyo Verde, Rio Negro Province, Patagonia, Argentina.

Horizon: Top of the Cerrito del Mamifero, middle section of the Los Alamitos Formation.

Biostratigraphy:

Age: Allenian Tetrapoda Assemblage, Late Campanian-Early Maastrichtian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Right lower molar.

Hypodigm:

MACN-RN 162: Crown of an upper right molar.