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- Reptiles
- These are animals that are cold-blooded vertebrates, they lay eggs, and are hairless.
- Rhynchosaurs
- Rhynchosaurs were large reptiles that lived in the Triassic, most of which had beaks. They were not dinosaurs, although they sometimes resembled them.
- Rutiodon
- This was a phytosaur, a primitive crocodile relative, that grew to about 10 feet (3 m) in length. Some members of the phytosaur family could get very large, up to 40 feet. Phytosaurs like Rutiodon lived in rivers, swamps, coastal marshes and lagoons during the Triassic and in the very early Jurassic. They were fresh water dwellers and, because dinosaurs were still relatively small, they were the dominant carnivores on land. There were likely some spectacular fights between Rutiodon and dinosaurs. Rutiodon lived throughout North America and Europe.
These creatures were very closely related to the ancestors of modern crocodiles. It is believed that they shared a common ancestor, a Psuedosuchian thecodont.
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