Marginocephalia

From Wikipedia, the free encyclopedia

iMarginocephalians Fossil range: Jurassic-Cretaceous
Skull of Triceratops.
Conservation status
Extinct (fossil)
Scientific classification
Kingdom: Animalia Phylum: Chordata Class: Sauropsida Superorder: Dinosauria Order: Ornithischia (unranked) Heterodontosauriformes Suborder: Marginocephalia Sereno, 1986
Groups
Pachycephalosauria Ceratopsia

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.

[edit] Taxonomy

CLADE HETERODONTOSAURIFORMES

• Family Heterodontosauridae
• SUBORDER MARGINOCEPHALIA
  • Infraorder Pachycephalosauria
  • Infraorder Ceratopsia
    • Yinlong
    • Chaoyangsaurus
    • Family Psittacosauridae
    • Neoceratopsia
      • Liaoceratops
      • Archaeoceratops
      • Family Leptoceratopsidae
      • Coronosauria
        • Family Protoceratopsidae
        • Family Ceratopsidae