- Marginocephalia
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Marginocephalians
Temporal range: Late Jurassic–Late Cretaceous, 156–65 Ma
Skull of Triceratops horridus Scientific classification 
Kingdom: Animalia Phylum: Chordata Class: Reptilia Superorder: Dinosauria Order: †Ornithischia Node: †Cerapoda Node: †Marginocephalia
Sereno, 1986Subgroups 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.
Classification
The cladogram below follows a 2009 analysis by Zheng and colleagues.[1]
Marginocephalia Pachycephalosauria Pachycephalosauridae
Ceratopsia Neoceratopsia Coronosauria
Cladogram after Butler et al., 2011.[2]
Marginocephalia Pachycephalosauria Pachycephalosauridae
Ceratopsia Neoceratopsia Coronosauria
References
- ^ Zheng, Xiao-Ting; You, Hai-Lu; Xu, Xing; Dong, Zhi-Ming (19 March 2009). "An Early Cretaceous heterodontosaurid dinosaur with filamentous integumentary structures". Nature 458 (7236): 333–336. doi:10.1038/nature07856. PMID 19295609.
- ^ Richard J. Butler, Jin Liyong, Chen Jun, Pascal Godefroit (2011). "The postcranial osteology and phylogenetic position of the small ornithischian dinosaur Changchunsaurus parvus from the Quantou Formation (Cretaceous: Aptian–Cenomanian) of Jilin Province, north-eastern China". Palaeontology 54 (3): 667–683. doi:10.1111/j.1475-4983.2011.01046.x.
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