Dimetrodon was a proto-mammal that lived in the permian period,a period in the paleozoic.It was a carnivore that was at the top of the food chain.Scientists are still trying to figure out the use of the sail. * Different versions of dimetrodon:Image:Dimetrodon1.jpgImage:Dimetrodon2.jpgImage:Dimetrodon3.jpg * Special Dimetrodon:Dimee Image:Dimetrodon2.jpg Image:Direwolf.jpgWhat possiblly could be wrong? This article is a . You can help My English Wiki by expanding it.