Reptilia - Dinosauria - Pachycephalosauridae

Alternative combinations: Gravitholus sternbergi, Hanssuessia sternbergi, Hansuessia sternbergi, Stegoceras sternbergi, Troodon sternbergi

Full reference: B. Brown and E. M. Schlaikjer. 1943. A study of the troödont dinosaurs with the description of a new genus and four new species. Bulletin of the American Museum of Natural History 82(5):115-150

Belongs to Hanssuesia according to R. M. Sullivan 2006

Sister taxa: none

Type specimen: NMC 8817, a skull. Its type locality is southeast of Steveville (NMC), which is in a Campanian terrestrial horizon in Canada.