Protorosaurus ("first lizard") is a genus of lizard-like early reptiles. It lived during the Permian period in Germany. It was a small, lizard-like creature with long legs and a long neck. This suggests that it was a fast runner, though it may have primarily fed on insects. It is a member of the group of extinct reptiles called Protorosauria, which is named after it. This group also includes other oddities, such as the long-necked Tanystropheus and the hind limb winged Sharovipteryx. A specimen of Chasmosaurus, was accidentally called Protorosaurus (in this case meaning "before Torosaurus), however, once it was realized that an animal with the same name already existed, the name was switched to Chasmosaurus.