Species: koerneri BRETT-SURMAN, 1979
Etymology: In honor of Dr. Harold E. Koerner, professor emeritus, University of Colorado.
Holotype: FMNH P13423
Locality: 2 miles east of head of Rio Chico, near the Lake Colhue Huapi and to the west of the Gulf of San Jorge, Chubut Province, Patagonia, Argentina.
Horizon: Upper Bajo Barreal Formation (old San Jorge Formation, (?Laguna Palacios Formation, BONAPARTE, 1996)).
Age: Maastrichtian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Ilia, prepubis, scapula, fibula, caudals, and partial braincase.