Marginocephalia

iMarginocephalians Fossil range: Jurassic-Cretaceous
Skull of Triceratops.
Conservation status
Extinct (fossil)
Scientific classification
Kingdom: Animalia Phylum: Chordata Class: Sauropsida 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

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