Genus: Quirogatherim BONAPARTE, 1990
Etymology: In honor of the late Juan C. Quiroga, pioneer of paleoneurological research in Argentina and Greek, therium, "beast."

Species: major BONAPARTE, 1990
Etymology: Latin, major, "greater."

Holotype: MACN-RN 171

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: Complete crown of a right upper molar.

Note: Quirognatheridae