Describer

Brown& Schlaikjer, 1943

Time

Cretaceous Late Campanian

Classification

Ornithischia Genasauria Cerapoda Marginocephalia Pachycephalosauria Pachycephalosauridae

Diet

Herbivore

Fossilsite

Judith River Formation, (Wedge) Kennedy Coolee, Montana, US

Fall Under

Pachycephalosaurus

Info

Pachycephalosaurus (Brown& Schlaikjer, 1943) = Tylosteus (Leidy, 1872)

Pachycephalosaurus > Pachycephalosaurus wyomingensis (Gilmore, 1931) >> Troodon wyomingensis (Gilmore, 1931) >>> Tylosteus ornatus (Leidy, 1872), Pachycephalosaurus grangeri (Brown & Schlaikjer, 1943) Pachycephalosaurus reinheimeri (Brown & Schlaikjer, 1943)

Pachycephalosaurus (Brown& Schlaikjer, 1943) > Pachycephalosaurus wyomingensis (Gilmore, 1931) > Dracorex hogwartsia [Juvenile] (Bakker, Sullivan, Porter, Larson & Saulsbury, 2006) > Stygimoloch spinifer [subadult] Galton & Sues, 1983 >> Stenotholus kohleri (Giffin, Gabriel & Johnson, 1987)

Frontoparietal with squamosals