スファエロトルス
Schlaikjer (1943). "A study of the troödont dinosaurs with a description of a new genus and four new species." Bulletin of the American Museum of Natural History 82(5): 115-149.
↑ Longrich, N. R., J. T. Sankey, et al. (2010). "Texacephale langstoni, a new genus of pachycephalosaurid (Dinosauria: Ornithischia) from the upper Campanian Aguja Formation, southern Texas, USA." Cretaceous Research 31: 274-284.