Dimetrodon, whose name means "two-measured teeth."
In other news, I am hard at work on my next post in the History of Your Teeth series. Here's a nice image of someone you're going to meet then. She's relatively famous, and often mistaken in pop culture for a dinosaur; however, like your cousin A. Florensis, she was not a reptile, and pre-dated the dinosaurs by about 100 million years.
She was also, quite likely, your direct ancestor. If you're the praying or meditating type, honor her in your next quiet-time.