1) Class 2) Subclass archosauria 
[n] - a large subclass of diapsid reptiles including: crocodiles
Archosauria The “ruling lizards”; the superorder of advanced diapsids that includes the modern crocodiles as well as the theodonts, perosaurs, and dinosaurs. Archosaurs are believed to have first appeared in the earliest Triassic period.
subclass Archosauria noun a large subclass of diapsid reptiles including: crocodiles; alligators; dinosaurs; pterosaurs; plesiosaurs; ichthyosaurs; thecodonts