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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:
- Squamata (lizards, snakes, mosasaurs, etc.)
- Sauropterygia (plesiosaurs, nothosaurs, etc.)
- Ichthyosauria (ichthyosaurs)
- Crocodilomorpha (crocodilians)
- Pterosauria (pterosaurs)
- Dinosauria (dinosaurs)
- Aves (birds)
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