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ZoomDinosaurs.com
What are Taxonomy and Cladistics How Are Dinosaurs Classified? Dinosaur Genera Not Dinosaurs, but Old and Interesting
Major Dinosaur Families Saurischian Dinosaurs
"Lizard-Hipped"
Ornithischian Dinosaurs
"Bird-Hipped"
Dinosaur Cladogram


Marginocephalia: Ceratopsians and Pachycephalosaurs

Styracosaurus Marginocephalians (meaning "fringed heads") are a group of Ornithischian (bird-hipped) dinosaurs that have a distinctive skull structure (a slight shelf or bony frill on the back of the skull), a unique palate (part of the mouth) and a short pubis (part of the hip).

These plant-eaters include the Ceratopsians (horned dinosaurs like Triceratops, Styracosaurus, Pentaceratops, Protoceratops, etc.) and the Pachycephalosaurians (thick-skulled dinosaurs like (Stegoceras, Pachycephalosaurus, etc.).

Marginocephalians may have evolved from the closely-related Ornithopods.

Marginocephalians:
Ceratopsia (Horned dinosaurs)


PROTOCERATOPS
Styracosaurus

STYRACOSAURUS


NOTOCERATOPS


TRICERATOPS


MONTANOCERATOPS
Monoclonius

MONOCLONIUS
Pachycephalosauria (Thick-skulled dinosaurs)


PACHYCEPHALOSAURUS


STEGOCERAS

WANNANOSAURUS



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