Diapsida

Taxonomy

• Subclass DIAPSIDA
  • Order Araeoscelidia
  • Order Avicephala (polyphyletic)
  • Order Younginiformes (paraphyletic)
  • Order Hupehsuchia
  • Order Thalattosauria
  • Superorder Ichthyopterygia (ichthyosaurs and grippidians)
    • Order Grippidia
    • Order Ichthyosauria
  • (unranked) Sauria
    • Infraclass Lepidosauromorpha
      • Order Eolacertilia
      • Superorder Lepidosauria (tuataras, lizards, amphibaenians, and snakes)
        • Order Sphenodontia (tuatara and extinct relatives)
        • Order Squamata (lizards, snakes, and amphibaenians)
      • Superorder Sauropterygia (plesiosaurs and relatives)
        • Order Placodontia
        • Order Nothosauroidea
        • Order Plesiosauria
    • Infraclass Archosauromorpha
      • Order Aetosauria
      • Order Choristodera
      • Order Phytosauria
      • Order Prolacertiformes
      • Order Pterosauria
      • Order Rauisuchia
      • Order Rhynchosauria
      • Order Trilophosauria
      • Superorder Crocodylomorpha (crocodilians and extinct relatives)
        • Order Crocodylia (crocodylians)
        • Order Mesosauria
        • Order Notosuchia
        • Order Protosuchia
        • Order Sphenosuchia
        • Order Tethysuchia
      • Clade Dinosauria (including birds)
        • Clade Ornithischia
        • Clade Saurischia (including birds)
          • Class Aves (birds)