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Marginocephalia
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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