 A study in 2014 shows that Dimetrodon was in an arms race against its prey . The smaller species , <unk> had no serrations since it ate small prey . As the prey grew larger , Dimetrodon started developing serrations and increasing in size . <unk> had enamel serrations that help it cut through flesh , and the same serrations can be found on <unk> . The second largest <unk> species , <unk> , has denticle serrations similar to sharks and theropod dinosaurs , making its teeth even more specialized to slice through flesh . This study not only shows the evolution of Dimetrodon over millions of years , but also shows that Dimetrodon was in an arms race against its prey . As prey grew larger , Dimetrodon countered it by growing larger and having sharper teeth . 
