Platyhystrix was an amphibian from Carboniferous Texas. Like Dimetrodon and Edaphosaurus, it had a sail, but it was not a Synapsid. Many of the animals from Texas and Arizona evolved sails to control their heat due to seasonal climate.

Platyhystrix in The Land Before Time

A Platyhystrix appear in Littlefoot's birth in The Land Before Time. It looks like a small, green amphibian with a sail on its back.

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