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Diapsids are a group of vertebrates that originally developed two holes behind the eye socket. Although in some groups these holes were lost again at a later stage in the evolution, they are still classified as diapsids based on their ancestry. Classified as diapsids are:

The earliest known diapsid is the Petrolacosaurus from the late Carboniferous in North America. In the Mesozoic, animal life was dominated by diapsids.

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