Kingdom Animalia
Phylum Chordata
Superclass Tetrapoda
Class Amphibia
Order Temnospondyli
Family Dissorophidae
Genus Platyhystrix
1st Species Platyhystrix rugosus
Other attributes
Time Range 299–279.5 mya
Location United States of America
Name Meaning Flat porcupine
Physical Dimensions 60 centimeters long
Dietary Classification Carnivore

Platyhystrix is a dissorophid temnospondyl amphibian from the Pennsylvanian-Cisuralian of the United States of America. It was named in 1910 by Ermine Cowles Case. It was a strange and unique amphibian, having characteristics of amphibians, reptiles, and early synapsids.


Platyhystrix had a regular temnospondyl build, with 4 legs, a moderately-sized tail, a bulky body, and a big head with big jaws. However, like most pelycosaur synapsids, and unlike most other temnospondyl amphibians, it had a large sail on its back. Its body would have been covered in scaly skin, with a few scutes on its back.


Platyhystrix was a predator, preying on insects, small fish, and smaller amphibians. Its teeth were small yet sharp, and were used to get a hold of struggling prey as the amphibian swallowed them whole.


So far, all we know about Platyhystrix is that it had a large sail used for thermoregulation, it lived on land, and the scutes on its back were used for stopping predators such as Eryops from effortlessly biting into it.

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