List of Transitional Fossils - Dinosauria

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The Dinosauria Evolutionary Series
Appearance Taxa Relationships Status Description Image
228 to 216.5 Ma

Genus:

  • Pisanosaurus

The oldest known ornithischian.
216–200 Ma

Genus:

  • Thecodontosaurus
 The most primitive well-known representative of the sauropodomorph dinosaurs.
??? Ma

Genus:

  • Huayangosaurus
 The oldest and most primitive known stegosaur.
??? Ma

Genus:

  • Stenopelix
 A basal pachycephalosaur from the Barremian Stage of the Cretaceous.
160 Ma

Genus:

  • Yinlong
 A genus of basal ceratopsian dinosaur from the Late Jurassic Period of central Asia.
160 Ma

Genus:

  • Guanlong
 A genus of proceratosaurid tyrannosauroid dinosaur, one of the earliest known examples of the lineage.
126 Ma

Genus:

  • Falcarius
 An early genus of therizinosaur
208–194 Ma

Genus:

  • Scelidosaurus
 One of the most primitive thyreophorans.
130–125 Ma

Genus:

  • Probactrosaurus
 A possible ancestor of the duck-billed dinosaurs.
??? Ma

Genus:

  • Pelecanimimus
 A primitive (basal) ornithomimosaur.

Read more about this topic:  List Of Transitional Fossils