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Diapsids ("two arches") are a group of tetrapods that developed two holes (temporal fenestra) in each side of their skulls, about 300 million years ago during the late Carboniferous period. Living diapsids are extremely diverse, and include all crocodiles, lizards, snakes, tuataras, and birds. Although some diapsids have lost either one hole (lizards), or both holes (snakes), or have a heavily restructured skull (modern birds), they are still classified as diapsids based on their ancestry.

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Aetosauria.JPG†Aetosaurs Archosauromorpha Arizonasaurus.jpg†Arizonasaurus Aves.jpgBirds
Champsosaurus.JPG†Champsosaurus "True" crocodiles.jpgCrocodylomorpha Dinosauria.jpgDinosaurs Euparkeria.jpg†Euparkeria
Hyperodapedon Ichthyosaurs.jpg†Ichthyosaurs Lepidosauromorpha Lizards
Mosasauridae.jpg†Mosasaurs Coelurosauravus 1.jpgNeodiapsida Ornithosuchus.jpg†Ornithosuchus Phytosauria.jpg†Phytosaurs
Plesiosaurs.jpg†Plesiosaurs Prestosuchus Postosuchus.jpg†Postosuchus Proterosuchus.JPG† Proterosuchids
Protochirotherium.JPG†Protochirotherium Protorosauria.JPG†Protorosaurs Pterosauria.jpg †Pterosaurs Sauropterygia
Snakes.jpgSnakes Rhynchocephalia.jpg Tuataras