Species: bishopi BONAPARTE, 2002
Etymology: In honor of Dr. B. Bishop, ex-Chairman of the Committee for Research and Exploration, National Geographic Society, Washingtion, D. C.

Holotype: MACN-RN 1034

Locality: Estancia Los Alamitos, west slope of Cerro Cuadrado, Arroyo Verde, Rio Negro Province, Patagonia, Argentina.

Horizon: Lower section of the Los Alamitos Formation.

Biostratigraphy:

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

Material: A left upper molar with complete crown and broken roots.