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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 at 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]
Cladogram after Butler et al., 2011.[2]
References
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Marginocephalia
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Stegoceras-line
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Pachycephalosaurus-line
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