Iguana 36-II
SAUROPSIDA
Classification
 
 
Grand Cayman Blue Iguana (Cyclura nubila lewisi)



Chapter Outline
  1. Description of Sauropsida
  2. Classification of Sauropsida
  3. Sphenodontia
  4. Squamata
  5. Serpentes
  6. Testudines
  7. Crocodylia
  8. Paleo Sauropsida

Tree
NCBI Tree | Paleo Tree



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In the previous chapter, it was mentioned that Tetrapoda, the four-legged animals, was split between amphibians and amniotes. Amphibians were explored in that chapter. Amniota is further split into two classifications: Sauropsida and Mammalia. Mammalia will be explored in chapter 38. Sauropsida contains animals formerly, and still informally, called reptiles as well as dinosaurs and birds. Birds will have their own chapter following this one. This chapter focuses on the animals still often referred to as reptiles and the non-bird dinosaurs.

Sauropsida's first split is betwen the class Lepidosauria and Archelosauria. Lepidosauria contains two orders: Sphenodontia, the beaked retiles, and Squamata, which contains lizards, snakes and many of the most common organisms thought of as reptiles. Archelosauria contains the turtles and the group Archosauria. Archosauria contains the family of alligators and crocodiles, the dinosaurs and the class of birds, called Aves.

  • Tetrapoda
    • Amphibia (Chapter 35)
    • Amniota
      • Sauropsida (This Chapter)
        • Lepidosauria
          • Sphenodontia - Tuataras (36-III)
          • Squamata - Lizards and Snakes (36-IV)
            • Dibamidae
            • Xenodermidae
            • Bifurcata
              • Gekkota - Geckos
              • Unidentata
                • Scinciformata - Skinks, Spinytail Lizards, Plated Lizards
                • Episquamata
                  • Laterata
                  • Toxicofera
                    • Anguimorpha
                    • Iguania
                    • Serpentes (36-V)
            • >>> Paleo Tree - Mosasaurs, etc.
        • Archelosauria
          • Testudinata
            • Testudines - Turtles (36-VI)
          • Archosauria
            • Crocodylia - Crocodiles (36-VII)
            • Dinosauria - Dinosaurs (36-VIII)
              • Ornithischia
              • Saurischia
                • (various dinosaurs)
                • Aves - Birds (Chapter 37)
      • Mammalia (Chapter 38)

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