Fig. 7From: Dimetrodon Is Not a Dinosaur: Using Tree Thinking to Understand the Ancient Relatives of Mammals and their EvolutionDinocephalian specimens. a The left side of the skull and jaw of Anteosaurus (SAM-PK-K11296), a carnivorous dinocephalian. b The left side of the skull of Ulemosaurus (PIN 2207/111), an herbivorous dinocephalian. Note the thickened bone on the upper surface of each skull, which may have been used in head-butting. Images are not to scaleBack to article page