Eoraptor lunensis

Eoraptor was one of the world's earliest dinosaurs. Some people think it may even just be an archosaur. It was a biped meat-eater that lived between 230 and 225 million years ago, in the northwestern region of Argentina. The type species is Eoraptor lunensis, which means "dawn plunderer [from the Valley] of the Moon", denoting where it was originally discovered (Greek eos/ηως meaning "dawn/morning" and Latin lunensis meaning "of the moon"). Paleontologists believe the Eoraptor resembles the common ancestor of all dinosaurs. It is known from several well-preserved skeletons.