Neornithischia

Diversity of Marginocephalians. Psittacosaurus, Pachycephalosaurus, Protoceratops, Triceratops, Stegoceras and Prenoceratops.

Six neornithischians (top to bottom): Psittacosaurus, Styracosaurus, Thescelosaurus, Kulindadromeus, Hypacrosaurus, Pachycephalosaurus

Six neornithischians (top to bottom): Psittacosaurus, Styracosaurus, Thescelosaurus, Kulindadromeus, Hypacrosaurus, Pachycephalosaurus

Six neornithischians (top to bottom): Psittacosaurus, Styracosaurus, Thescelosaurus, Kulindadromeus, Hypacrosaurus, Pachycephalosaurus

Sanxiasaurus modaoxiensis, a neornithischian dinosaur.

Nevadadromeus schmitti, a neornithischian dinosaur.

Changchunsaurus parvus, a neornithischian dinosaur.

Skeletal reconstruction of Eocursor parvus, a prionodontian neornithischian (after Butler et al., 2010).

Yandusaurus hongheensis, a neornithischian dinosaur.