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Temporal range: Late Carboniferous – Early Permian
|Artistic impression of a Platyhystrix rugosus|
| †Platyhystrix rugosus|
Platyhystrix was an amphibian from Carboniferous Texas. Like Dimetrodon and Edaphosaurus, it also had a sail, but it was not a Synapsid. Many of the animals from Texas and Arizona during the Early Permian Period evolved sails to control their heat due to seasonal climate.