Dinosaur classification

Dinosaurs are divided into two orders, the Saurischia and the Ornithischia, on the basis of their hip structure.

• Saurischia (from the Greek meaning "lizard hip") include all the theropods (bipedal carnivores) and sauropods (long-necked herbivores).
• Ornithischia (from the Greek meaning "bird-hip") is the other dinosauria order, most of which were quadrupedal herbivores.

These extinct animals are NOT dinosaurs! Plesiosaurs - Pterosaurs - Wooly Mammoths - Dimetrodon

Order Ornithischia

Ornithischia Pelvis

Main Article: Ornithischia (Bird-hipped)

Suborder: Thyreophora (armored dinosaurs)

Infraorder: Ankylosauria

* Ankylosauridae

* Nodosauridae

* Scelidosauridae

Infraorder: Stegosauria

* Huayangosauridae

* Stegosauridae

Suborder Cerapoda:

Infraorder: Ceratopsia

* Ceratopsidae (horned dinosaurs)

* Chaoyangsauridae

* Psittacosauridae

* Neoceratopsia

Infraorder: Ornithopoda (bird-footed)

* Hypsilophodontidae

* Iguanodontidae

* Hadrosauridae (duck-billed dinosaurs)

Infraorder: Pachycephalosauria

* Pachycephalosauridae

* Goyocephala

Order Saurischia

Saurischia Pelvis

Main Article: Saurischia (lizard-hipped)

Suborder Sauropodomorpha

Infraorder Sauropoda

• Brachiosauridae
• Camarasauridae
• Cetiosauridae
• Diplodocidae
• Dicraeosauridae
• Euhelopodidae
• Nemegtosauridae
• Omeisauridae
• Rebbachisauridae
• Titanosauridae
• Vulcanodontidae

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Dinosaurs

Suborder Theropoda

• Coelophysidae
• Elaphrosauridae
• Ceratosauridae
• Noasauridae
• Abelisauridae
• Spinosauridae
• Allosauridae
• Sinraptoridae
• Carcharodontosauridae
• Tyrannosauridae
• Troodontidae
• Microraptoria
• Dromaeosauridae

Infraorder Prosauropoda