positions within Sauria, including Archosauromorpha.

Almost all non-lepidosaurian lepidosauromorphs became extinct by the end of the Triassic, the with the latest non lepidosaur-lepidosauromorphs being Marmoretta from the Middle-Late Jurassic of Britain and Iberia, and an indeterminate form from the Middle Jurassic Moskvoretskaya Formation of Russia, which appear to be closely related