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.