Tetrapods

The tetrapods are a superclass of animals that are descended from a salamander-like amphibians. [1] Living decendants of primordial tetrapods include mammals, birds, reptiles and modern amphibians. [2]

References

  1. ↑ http://en.wikiversity.org/wiki/2.0_Hackolution#Transformers
  2. ↑ http://species.wikimedia.org/wiki/Tetrapoda
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