The Sauropsida includes all modern and most extinct "reptiles", but excludes synapsids. Living sauropsids include lizards, snakes, turtles, crocodiles, and birds.

Which of the following are sauropsids?

Living sauropsids include lizards, snakes, turtles, crocodiles, and birds. Extinct sauropsids include non-avian dinosaurs, pterosaurs, plesiosaurs, ichthyosaurs, and many others.

Are Thecodonts sauropsids?

Thus his Sauropsida included Procolophonia, Eosuchia, Millerosauria, Chelonia (turtles), Squamata (lizards and snakes), Rhynchocephalia, Crocodilia, "thecodonts" (paraphyletic basal Archosauria), non-avian dinosaurs, pterosaurs, ichthyosaurs, and sauropyterygians.