Treasures of the Internet: Ecosystems

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Dinosaur Groups

Dinosauria includes animals whose bodies were built around two very different pelvic structures. Accordingly, Dinosauria is divided into two major groups:

Untitled Saurischia ("Lizard-hipped" or "Reptile-hipped")
Untitled Ornithischia ("Bird-hipped")

Untitled Saurischia ("Lizard-hipped" or "Reptile-hipped")

Untitled Theropoda (Beast foot)
- Untitled Coelurosauria
  - Avimimidae
    - Avimimus
  - Coelophysidae
    - Coelurus
  - Compsognathidae
    - Compsognathus
  - Ornithomimidae
  - Therizinosauridae
    - Segnosaurus
    - Therizinosaurus
  - Troodontidae
    - Saurornithoides
    - Troodon
  - Tyrannosauridae
  - incertae sedis
    - Ornitholestes
- Untitled Ceratosauria
- Untitled Maniraptora
- Untitled Tetanurae
- Untitled basal Theropod
Untitled Sauropodomorpha

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First Written: 19990104 Latest Update: 20060328 Untitled

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