Marginocephalia

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Marginocephalians
Fossil range: Jurassic-Cretaceous
Skull of Triceratops.
Skull of Triceratops.
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Suborder: Cerapoda
(unranked) Marginocephalia
Sereno, 1986
Sub-clades

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.

[edit] Phylogeny

Heterodontosauriformes
|--Heterodontosauridae
`-- Marginocephalia
    |--Pachycephalosauria
    `--Ceratopsia


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