animal order - the order of animals

Archosauria, subclass Archosauria - a large subclass of diapsid reptiles including: crocodiles; alligators; dinosaurs; pterosaurs; plesiosaurs; ichthyosaurs; thecodonts

saurischian, saurischian dinosaur - herbivorous or carnivorous dinosaur having a three-pronged pelvis like that of a crocodile

Sauropodomorpha, suborder Sauropodomorpha - gigantic herbivorous dinosaurs having huge bodies with long necks and small heads: Prosauropoda and Sauropoda (apatosaurus, diplodocus and titanosaurs)