| Named By: | L. I. Price in 1948 |
| Time Period: | Guadalupian, 270 Ma |
| Location: | Brazil - Pedra do Fogo Formation |
| Size: | Most specimens estimated to be about 2-2.5 meters long. One excpetionally large skull however has a length of about 1.6 meters, suggesting that this individual had a total body length of about 9 meters |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Several individuals, usually of skulls |
| Classification: | | Chordata | Amphibia | Temnospondyli | Archegosauridae | Platyoposaurinae | |
Prionosuchus is an extinct genus of large temnospondyl. A single species, P. plummeri, is recognized from the middle Permian period (270 million years ago). Its fossils have been found in what is now northeastern Brazil.