The wolf lizard (genus name: Inostrancevia), also known as the Inostrancevia, is a genus of theropod animals in the order Theropoda. It is a quadrupedal animal with four limbs standing upright below its body. The skull is 45 centimeters long and approximately 1 to 4.3 meters in length, with strong muscle attachments on the bones. Compared to other more primitive theropod animals such as the Bamo crocodile, the wolf lizard has smaller eye sockets and larger temporal fenestrae. Fossils were discovered in Sokolki, North Dvina River basin, Arkhangelsk Oblast, Russia. Wolf lizards lived in the Late Permian period 251 million years ago. South Africa has also discovered wolf lizards, which have been named African wolf lizards.