Hypsilophodontia

Hypsilophodontia Temporal range: Early Cretaceous–Late Cretaceous, 130–125 Ma PreЄ Є O S D C P T J K Pg N ↓
Adult and juvenile skeletons of Hypsilophodon
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Order:	†Ornithischia
Suborder:	†Ornithopoda
Clade:	†Hypsilophodontia Dollo, 1882
Subgroups
†Hypsilophodon

Hypsilophodontia is a clade of small to large bodied ornithopods that lived during the Cretaceous that were found in North America, Eurasia and Australia. Traditionally the group has included almost all bipedal bird-hipped dinosaurs other than iguanodonts, and some phylogenetic analyses found it to be a natural group, but most recent studies have found that the group is mostly paraphyletic and the taxa within represent a series leading up to Iguanodontia.