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Discovery and Classification
Terrible Lizards Discovered | Classification | Saurischia
Iguanodontia | Sauropodomorpha | Theropoda | Ornithischia
Marginocephalia | Ceratopsia | Pachycephalosauria
Ornithopoda | Thyreophora | Stegosauria | Ankylosauria

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Marginocephalia, (mahr-GIN-oh-sef-FAY-lee ah) is a suborder of small-to-large-sized ornithischians, either bipedal or quadrupedal. The group is a relatively new (although not secure) suborder of Ornithischia. The other two suborders are Thyreophora and Ornithopoda. Marginocephalia, a mostly Late Cretaceous suborder, is composed of two infraorders: the domed or thick-headed Pachycephalosauria, and the frill-headed and horned groups of Ceratopsia, which includes Triceratops within its families. Subtle characteristics in the pelvic area, namely the ischium and pubis, as well as frill similarities help to differentiate Marginocephalia from other ornithischians.

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