Dinosauria

 Ornithischia
    Cerapods
       Marginocephalia
       Ornithopoda
    Thyreophora
       Stegosaura
       Ankylosaurs
 Saurischia
    Sauropomorpha
       Prosauropoda
       Sauropoda
    Theropods
       Ceratosauria
       Titetanurae
Cerapods
The Cerapods are only a group you must have in the dinosaur "family tree". The definition of a Cerapoda is too complicated to have only one group and because of that there are a lot of under-groups, because of the many different dinosaurs. The dinosaurs under this group are the duck-billed dinosaurs, the rhino-like dinosaurs, the thickheaded dinosaurs and a dinosaur with feet’s like a bird. Therefore is the group divided into two under-groups, the Marginocephalias and the Ornithopods.
CERAPODS
The cerapods (or cerapoda) were a group of ornithischian (bird-hipped) dinosaurs that included the ornithopods and the marginocephalians.
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