Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Suborder: Cerapoda
(unranked) Heterodontosauriformes

Heterodontosauriformes are a group of herbivorous dinosaurs within the order Ornithischia. The rank was created by Xu et al in 2006 to group the suborder Marginocephalia with the family Heterodontosauridae (previously classified as ornithopods), after the discovery of Yinlong revealed the two to be closely related.

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