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Base of the evolutionary tree for Tetrapods (Tetrapoda)

Tetrapods (Tetrapoda) (34907 species)
- Amniotes (Amniota) → (26217 species)
  - sauropsids (Sauropsida) → (21171 species)
    - lepidosaurs (Lepidosauria) → (10915 species)
      - Lizards and Snakes (Squamata) → (10914 species)
      - Tuatara (Sphenodon punctatus)
    - Birds, turtles, and crocodilians (Archelosauria) → (10256 species)
      - birds and crocodilians (Archosauria) → (10025 species)
      - Turtles (Testudines) → (231 species)
  - Mammals (Mammalia) → (5046 species)
    - Therian Mammals (Theria) → (5041 species)
      - Placental mammals (Eutheria) → (4741 species)
      - Marsupials (Marsupialia) → (300 species)
    - Monotremes (MONOTREMATA) → (5 species)
      - Echidnas (Tachyglossidae) → (4 species)
      - Platypus (Ornithorhynchus anatinus)
- Amphibians (Amphibia) → (8690 species)
  - Batrachia → (8461 species)
    - Frogs and toads (Anura) → (7682 species)
      - unnamed group 877241 → (7675 species)
      - unnamed group 877235 → (7 species)
    - Salamanders and Newts (Caudata) → (779 species)
      - unnamed group 876533 → (702 species)
      - Cryptobranchoidea → (77 species)
  - Caecilians (Gymnophiona) → (229 species)
    - unnamed group 876241 → (215 species)
      - unnamed group 876295 → (161 species)
      - Asiatic Tailed Caecilians (Ichthyophiidae) → (54 species)
    - Neotropical Tailed Caecilians (Rhinatrematidae) → (14 species)
      - unnamed group 876230 → (12 species)
      - unnamed group 876229 → (2 species)

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