Pachycephalosaurus

Pachycephalosaurus Temporal range: Late Cretaceous (Maastrichtian), 70–65 Ma PreЄ Є O S D C P T J K Pg N ↓
Pachycephalosaurus wyomingensis
Scientific classification
Unrecognized taxon (fix):	Pachycephalosaurus
Species
P. wyomingensis (Gilmore, 1931)
Synonyms
Tylosteus ornatus Leidy, 1872 Troodon wyomingensis Gilmore, 1931 Pachycephalosaurus grangeri Brown & Schlaikjer, 1943 Pachycephalosaurus reinheimeri Brown & Schlaikjer, 1943 Stenotholus kohleri Giffin, Gabriel & Johnson, 1988 Stygimoloch spinifer? Galton & Sues, 1983 Dracorex hogwartsia? Bakker et al., 2006

Pachycephalosaurus (from Greek pachys-/παχύς- "thik", kephale/κεφαλή "heid" an sauros/σαῦρος "lizard") is a genus o pachycephalosaurid dinosaur that leeved in whit is nou North Americae in the Late Cretaceous period (Maastrichtian), aboot 70-65 million years aby (mya).