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waqaskhan15836

Answer:

Sphenodontia

  • least specialized of all living reptiles
  • arose in the Mesozoic era
  • include tuataras;
  • several unique features of the skull and jaws clearly define them and distinguish the group from the squamates

Squamata:

  • Most specialized reptiles.
  • arose in the late Permian
  • include lizards and snakes
  • largest extant clade of reptiles

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