Dinocephalosaurus

…such a live-bearing form is Dinocephalosaurus, an archosauromorph—that is, a form more closely related to archosaurs than lepidosaurs (the lineage containing modern lizards and snakes, their direct ancestors, and their close relatives)—which lived about 245 million years ago.

…birth to live young was Dinocephalosaurus, an archosauromorph—a member of a group that includes all of the forms more closely related to archosaurs (dinosaurs, pterosaurs [flying reptiles], crocodiles, and birds) than to lepidosaurs—that lived about 245 million years ago.