Late Triassic to late Cratecous
The Suborder Sauropodomorpha is a division of the order Saurischia,
the lizard-hipped dinosaurs. It includes two groups of medium and large plant-eating
dinosaurs: the Infraorder Prosauropoda (early plant-eating or possibly plant-
and meat-eating animals with long necks), and the Infraorder Sauropoda (later
large, four.legged plant-eaters with long necks).