Sauropsida (Goodrich, 1916) or reptiles are chordates which have scales and breathe air. Reptiles are also generally cold-blooded (with a few exceptions, such as the dinosaurs).
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- Agnathasauria (A class of reptiles with a radial, jawless mouth)
- Avicephala (A class of bizarre lizards with a bird-shaped head)
- Homosauria (Manlike reptiles)
- Mandibulosauria (An order of reptiles which possess a clawlike mouth structure)
- Ornithischia (Dinosaurs that have birdlike hipbones)
- Piscisauria (Fish-headed reptiles)
- Saurischia (Reptiles that have hip bones in the rear legs)
- Squamata (Modern lizards, snakes, and worm lizards)
- Suidines (An order of reptiles with mammal-like snouts, similar to those of Suidae)
- Testudines (Ectothermic reptiles, most of whose body is shielded by a special bony or cartilagenous shell developed from their ribs)
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