Prionosuchus
It was one of a group known as the Archegosaurs. The archegosaurs were a group of temnospondyls that occupied the ecological niche of crocodiles and alligators during the Permian. The smaller European genus Archegosaurus is typical. The group went extinct at the end of the Permian. In the Triassic, the niche was filled by other temnospondyls and by reptiles such as the phytosaurs.