[D] Stegoceras [sG]
Cretaceous Late Campanian Maastrichtian
Ornithischia Genasauria Cerapoda Marginocephalia Pachycephalosauria Pachycephalosauridae
Genus - Skull
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)
Stegoceras (\\\"Horny roof\\\") was a gaot-sized pachycephalosaurid known from one partial skeleton and dozens of mostly partial skulls. The skulls evidently became thicker and higher with age, especially in males. A male\\\'s dome overgrew the bony skull shelf.
Stegoceras was about 2.4 m (8ft) long, and lived in Alberta, Canada and Montana, US in the Late Cretaceous. The reason several species of Stegoceras were originally described as Troodon was that this genus was erroneously equated with Troodon due to the occurrance of associated Troodon teeth.