Period: Late Cretaceous
Order, Suborder, Family: Ornithischia, Marginocephalia, Pachycephalosauridae
Location: Asia (Mongolia)
Length: Unknown, but probably no more than 6 1/2 feet (2 meters)
Tylocephale is one of a group of new dome-headed dinosaurs discovered by the Joint Polish-Mongolian Paleontological Expeditions to the Gobi Desert. Meaning "swollen head," Tylocephale was named in 1974 by Teresa Maryanska and Halszka Osmólska on the basis of a skull that was missing much of the snout and the front part of the high dome. It lived during the Late Cretaceous, much like its relatives Prenocephale from central Asia, and Stegoceras, Stygimoloch, and Pachycephalosaurus from North America.
The skull of Tylocephale had a high, narrow dome. The bones that formed the dome were tightly joined, making them strong. The back of the dome was flared out into a large, short shelf or frill over the back of the braincase and neck. On this shelf were bony bumps and pits. Tylocephale had simple teeth and probably ate leaves and fruit.
The domed skull of Tylocephale was not damaged by being hit; it needed this strength during head-butting contests for territory and females.