Drepatrosaurus is closely related to Megalancosaurus and shared some of its arboreal specializations. It lived in the same area at the same time. The fact that two such delicate tree-living animals have been preserved in these fine sediments suggests that perhaps tree-living reptiles were common everywhere but not usually fossilized.
Features: The only skeleton known lacks the head and neck, but the prehensile tail has the same hook on the end as Megalancosaurus. The forelimbs, however, are quite different. The second finger has an enormous claw, as big as the rest of the hand, and the bones of the arm are adapted to working this. A hump on the shoulders may show the attachment of strong arm muscles. A similar animal. Dolabrosaurus. is known from the late Triassic deposits of Arizona, USA.