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Reptilia
Reptiles
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hey are characterized by breathing air, laying shelled eggs, and having skin covered in scales and/or scutes. Reptiles are classically viewed as having a "cold-blooded" metabolism. They are tetrapods (either having four limbs or being descended from four-limbed ancestors). Modern reptiles inhabit every continent with the exception of Antarctica, and four living orders are currently recognized:

* Crocodilia (crocodiles, gavials, caimans, and alligators): 23 species
* Sphenodontia (tuataras from New Zealand): 2 species
* Squamata (lizards, snakes, and worm lizards): approximately 7,900 species
* Testudines (turtles and tortoises): approximately 300 species


Reptilia :
Eureptilia - True Reptiles
Anapsida

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Reptilia
Tetrapoda
Four Feet
Tetrapodomorpha
Four Legs
Sarcopterygii
Gnathostomata
Jaws
Vertebrata
Vertibrates
Chordata
Chords
Deuterostomia
Mouth Second
Bilateria
Two-Way Symmetry
Eumetazoa
True Higher Animals
Animalia
Animals
Eukaryota
Eukaryota
Cells with a Nucleus

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