Marginocephalia

Marginocephalians; Temporal range: Late Jurassic–Late Cretaceous, 156–65 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Skull of Triceratops.
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Superorder:	Dinosauria
Order:	Ornithischia
Suborder:	Cerapoda
(unranked):	Marginocephalia; Sereno, 1986
Sub-clades
	Ceratopsia; Pachycephalosauria;

Marginocephalia ("fringed heads") is a clade of ornithischian dinosaurs that includes the thick-skulled pachycephalosaurids, and horned ceratopsians. They were all herbivores, walking on two or four legs, and are characterized by a bony ridge or frill the back of the skull. The clade evolved in the Jurassic period, and became common in the Upper Cretaceous.

Phylogeny

The cladogram below follows a 2009 analysis by Zheng and colleagues.^[1]

Marginocephalia

unnamed

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	Homalocephale

	Pachycephalosauridae

Ceratopsia

Micropachycephalosaurus

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	Leptoceratopsidae

	Coronosauria

References

^ Zheng, X-.T., You, H.-L., Xu, X. and Dong, Z.-M. (2009). "An Early Cretaceous heterodontosaurid dinosaur with filamentous integumentary structures." Nature, 458(19): 333-336.

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[zheng2009-1] Zheng, X-.T., You, H.-L., Xu, X. and Dong, Z.-M. (2009). "An Early Cretaceous heterodontosaurid dinosaur with filamentous integumentary structures." Nature, 458(19): 333-336.

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