Infraorder5 species
Ankylosauria
Heavily armored quadrupedal ornithischians protected by osteoderms and tail clubs.
Dinosaur Taxonomy & Cladistics
Modern paleobiology groups dinosaurs cladistically based on shared evolutionary novelties (synapomorphies). Browse major suborders, infraorders, and clades.
Infraorder8 species
Ceratopsia
Ornithischian dinosaurs characterized by beaks, rostral bones, facial horns, and elaborate neck frills.
Suborder9 species
Ornithopoda
Beaked, bipedal and facultatively quadrupedal herbivores with complex multi-layered dental batteries.
Infraorder3 species
Pachycephalosauria
Bipedal ornithischians with extremely thickened skull domes reinforced by dense cortical bone.
Suborder22 species
Sauropodomorpha
Herbivorous saurischians characterized by elongated necks, columnar limbs, and enormous body volumes.
Infraorder6 species
Stegosauria
Quadrupedal herbivores distinguished by two rows of alternating dorsal plates and caudal tail spikes (thagomizers).
Suborder47 species
Theropoda
Bipedal saurischian dinosaurs, historically dominated by carnivores and including the avian lineage.