Prionosuchus
Cox and Hutchinson re-evaluated Prionosuchus in 1991 and thought it was synonymous with the genus Platyoposaurus from Russia. However, Platyoposaurus had a total length of only 2.5 meters (8.2 ft), which suggested that the two animals were at least different species. The age of the sediments suggested the two were not comtemporaries. Most paleontologists consider Prionosuchus  as a valid genus.