Tylosteus
tie-LOSS-tee-us /taɪˈlɒstiəs/
Synonym of Pachycephalosaurus
knob bone
- tylos · Greek · knob, lump
- osteon · Greek · bone
The name combines Greek words for a knob or lump and for bone. It refers to the thick, knobby skull bone of the fragmentary specimen Leidy described, which is typical of a dome-headed (pachycephalosaurid) dinosaur.
- Named by
- Leidy
- Year named
- 1872
- Period
- Late Cretaceous
- Stage
- Maastrichtian
- Found in
- Wyoming, USA
Tylosteus ornatus was based on fragmentary skull material and is generally regarded as a pachycephalosaurid. It is usually treated as a synonym of Pachycephalosaurus, but the material is poor, so its status is uncertain. Some authors may treat it as a doubtful name. Please check the current literature before relying on this.