Dimetrodon (dīˈmetrəˌdän)
Much to my surprise the dimetrodon is not a dinosaur. I grew up always thinking that it was. They actually lived millions of years before the dinosaurs and are more closely related to mammals. Even though they are more closely related to mammals they are not a direct ancestor or descendant of mammals. So the dimetrodon is like the brontosaurus which now no longer exists and Pluto which is not a planet.
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