List of marginocephalian type specimens

This list of marginocephalian type specimens is a list of fossils serving as the official standard-bearers for inclusion in the species and genera of the dinosaur clade Marginocephalia, which includes the thick-headed pachycephalosaurs and the horned ceratopsians. Type specimens are those which are definitionally members of biological taxa and additional specimens can only be "referred" to these taxa if an expert deems them sufficiently similar to the type.

The list

Species	Genus	Nickname	Catalogue Number	Institution	Age	Unit	Country	Notes	Images
Pachycephalosaurus reinheimeri	N/A	N/A	DMNH 469	Denver Museum of Natural History		Lance Formation	United States		Holotype of Pachycephalosaurus reinheimeri.
Pachycephalosaurus wyomingensis	Pachycephalosaurus	N/A	USNM 12031	United States National Museum			United States		Holotype of Pachycephalosaurus wyomingensis.
Triceratops horridus	Triceratops	N/A	YPM 1820	Yale Peabody Museum	Maastricthian	Lance Formation	United States		YPM 1820, the holotype of Triceratops horridus.
Triceratops obtusus	N/A	Hatcher	USNM 4720	United States National Museum			United States		USNM 4720, the holotype of Triceratops obtusus.