Ornithischia

"Basal ornithischians" (Fabrosauridae)

Systematics

The ornithischians are further divided in the two clades: the first are the Thyreophora, which include the Stegosauria (like the armored Stegosaurus) and the Ankylosauria (like Ankylosaurus); the second the Cerapoda, which include the Marginocephalia (Ceratopia like the frilled ceratopsidae and Pachycephalosauria) and the Ornithopoda (among which duck-bills (hadrosaurs) such as Edmontosaurus). The Cerapoda are a relatively recent grouping (Sereno, 1986), and may conceivably be identical to (synonymous with) the older group, Ornithopoda: most of these divisions are not true by definition.

Related Topics:
Clades - Thyreophora - Stegosauria - Stegosaurus - Ankylosauria - Ankylosaurus - Cerapoda - Marginocephalia - Ceratopia - Ceratopsidae - Pachycephalosauria - Ornithopoda - Duck-bill - Edmontosaurus

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