Marginocephalia
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Marginocephalia ("fringed heads") is a group 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.
Taxonomy
- Family Heterodontosauridae
- SUBORDER MARGINOCEPHALIA
- *Infraorder Pachycephalosauria
- *Infraorder Ceratopsia
- **Yinlong
- **Chaoyangsaurus
- **Family Psittacosauridae
- **Neoceratopsia
- ***Liaoceratops
- ***Archaeoceratops
- ***Family Leptoceratopsidae
- ***Coronosauria
- ****Family Protoceratopsidae
- ****Family Ceratopsidae
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