animal order - the order of animals

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

Plesiosauria, suborder Plesiosauria - any of the plesiosaurs

Nothosauria, suborder Nothosauria - a suborder of Sauropterygia