Platyhystrix (from Greek: πλατύς platús, 'flat' and Greek: ῠ̔́στρῐξ hústrix, 'porcupine') is an extinct temnospondyl amphibian with a distinctive sail along its back, similar to the unrelated synapsids, Dimetrodon and Edaphosaurus.
Platyhystrix (Greek: πλατύς platús for 'flat' and Greek: ῠ̔́στρῐξ hústrix for 'porcupine') is an extinct temnospondyl amphibian with a notable dorsal fin along its back, comparable to unrelated synapsids like Dimetrodon and Edaphosaurus.