Tylocephale (meaning "swollen head", from the Greek τυλη meaning 'callus' or 'hard swelling' and κεφαλη meaning 'head') is a genus of pachycephalosaurid dinosaur from the Late Cretaceous period. It was a herbivorous dinosaur, reaching in length and in body mass. It had the tallest dome of any known pachycephalosaur. Tylocephale lived during the Campanian stage, around 74 million years ago. It was discovered in the Khulsan locality of the Barun Goyot Formation, Mongolia sometime between 1965 and 1971. The type species is T. gilmorei, described by Teresa Maryańska and Osmólska in 1974 based on a partial skull (specimen ZPAL MgD-I/105). Pachycephalosaurids evolved in Asia and then migrated into North America, thus it is likely that Tylocephale migrated back into Asia. It is closely related to Prenocephale. See also Timeline of pachycephalosaur research References External links Tylocephale in the National History Museum's Dino Directory Late Cretaceous dinosaurs of Asia Fossil taxa described in 1974 Pachycephalosaurs Taxa named by Teresa Maryańska Taxa named by Halszka Osmólska Ornithischian genera