Temporal range: Late Cretaceous, Turonian–Santonian
Watabe, Tsogtbaatar & Sullivan, 2011
Amtocephale is known from the holotype MPC-D 100/1203, a nearly complete frontoparietal dome of a subadult individual. It was collected from the Baynshire Formation at the Amtgai locality. Amtocephale was first named by Mahito Watabe, Khishigjaw Tsogtbaatar and Robert M. Sullivan in 2011 and the type species is Amtocephale gobiensis. The generic name combines a reference to the Amtgai site with a Greek κεφαλή, kephale, "head". The specific name refers to the provenance from the Gobi.
The frontoparietal dome, formed by a fusion of the frontals in front and the parietals in the back, has a length of 53.2 millimetres and a maximal thickness of nineteen millimetres. The contribution to the dome length of the parietal part is exceptionally large, with a portion of 41%.
- Mahito Watabe, Khishigjaw Tsogtbaatar and Robert M. Sullivan (2011). "A new pachycephalosaurid from the Baynshire Formation (Cenomanian-late Santonian), Gobi Desert, Mongolia" (PDF). Fossil Record 3. New Mexico Museum of Natural History and Science, Bulletin. 53: 489–497. <templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
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