Tylocephale (meaning “swollen head” is derived is derived from the Greek tule , which means ‘callus’ (also known as ‘hard swelling’), and kephale meaning head) is the genus that includes pachycephalosaurid dinosaurs from in the Late Cretaceous period. It was a herbivore dinosaur that was believed to be approximately 2 meters (6.6 feet) long. It had the highest dome of any pachycephalosaur known to exist.

Tylocephale was found in Tylocephale lived during the Campanian stage, which was around the age of 74 million. It was found in the Khulsan area within the Barun Goyot Formation in Mongolia. The species of interest is T. Gilmorei, first discovered by Teresa Maryanska and Osmolska in 1974 using a portion of a skull (specimen ZPAL MgD-I/105).

Pachycephalosaurids developed in Asia and then moved into North America, thus it is possible that Tylocephale moved back to Asia. It is closely with Prenocephale.

Source: Wikipedia