• Reptile evolution is currently an area of intense research and constant revision.
  • The earliest known reptile, pictured in Figure below, dates back about 315 million years.
  • Some of the earliest reptiles to diverge were ancestors of turtles.
  • Ancestral crocodilians evolved at least 220 million years ago.
  • Tuataras may have diverged from squamates (snakes and lizards) not long after that.
  • Finally, lizards and snakes went their separate ways about 150 million Years ago.
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