[D] Troodon edmontonensis
Describer
Brown & Schlaikjer, 1943
Time
Cretaceous Late Campanian Maastrichtian
Classification
Ornithischia Genasauria Cerapoda Marginocephalia Pachycephalosauria Pachycephalosauridae
Diet
Herbivore
Fossilsite
Horseshoe Canyon Formation, Alberta, Canada
Fall Under
Stegoceras
Info
Stegoceras (Lambe, 1902) > Stegoceras validum (Lambe, 1918) >> Stegoceras breve (Lambe, 1918)
Stegoceras > Stegoceras edmontonense (Brown & Schlaikjer, 1943) > Troodon edmontonensis (Brown & Schlaikjer, 1943)
Stegoceras > Ornatotholus (Galton & Sues, 1983) >> Stegoceras browni (Wall & Galton, 1979) >> Ornatotholus browni (Wall & Galton, 1979)
Stegoceras > Stegoceras novomexicanum (Jasinski & Sullivan 2011)
Based on the frontoparietal areas of three skulls. Included in Troodon by Sternberg in 1926. In 1943 Brown and Schlaikjer described a new form based on a single skull named Pachycephalosaurus which consisted out of three species, Pachycephalosaurus grangeri, Pachycephalosaurus wyomingensis, Pachycephalosaurus reinheimeri. They also erected two new species of Troodon, Troodon sternbergi and Troodon edmontonensis. The genus Troodon however was based on one single tooth that came from a small theropod dinosaur, and the Gilmore\\\'s \\\"Troodon\\\" was correctly renamed Stegoceras and Pachycephalosaurus became the namesake of the entire group of dome-heads, the Pachycephalosauridae.