Temnospondyls for Breakfast

I was supposed to get some work done this morning, but instead... this.

Platyhystrix the Permian temnospondyl. It has a back sail similar to many Permian synapsids, such as the famous Dimetrodon. It's a bit of a mystery why so many distantly related Permian animals had sails. Also, the fact that the poor animal's name means "flat porcupine" is hilarious.