dogs

There were two main groups, Saurischia (lizard hipped) and Ornithischia (bird hipped). The former is further divided into Sauropodomorpha and Theropoda, while the latter is divided into Thyreophora (stegosaurs and ankylosaurs), Neornithischia (hadrosaurs and others), and Marginocephalia (ceratopsians and pachycephalosaurs).

Markus Moser has written:

'Plateosaurus engelhardti Meyer, 1837 (Dinosauria: Sauropodomorpha) aus dem Feuerletten (Mittelkeuper; Obertrias) von Bayern =' -- subject(s): Morphologie , Systematik, Paleontology, Taphonomie, Paleontolgy, Plateosaurus, Plateosaurier

Troodon is a saurischian.

Saurischians include the theropoda (animals like Troodon, Tyrannosaurus, Allosaurus, Therizinosaurus and Birds) and the sauropodomorpha (animals like Plateosaurus, Diplodicus and Brachiosaurus.)

Ornithischians inlcude Triceratops, Stegosaurus, Ankylosaurus, Pachycephalosaurus and Parasaurolophus.

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