Aardonyx
An early stage in the evolution of sauropods.

Abrictosaurus
An early relative of Heterodontosaurus.

Abrosaurus
A close Asian relative of Camarasaurus.

Abydosaurus
The intact skull of this sauropod was discovered in 2010.

Acanthopholis
No, it's not a city in Greece.

Achelousaurus
Might this have been a growth stage of Pachyrhinosaurus?

Acristavus
This early hadrosaur lacked any ornamentation on its skull.

Acrotholus
North America's earliest bone-headed dinosaur.

Adamantisaurus
This titanosaur was named 50 years after its discovery.


Adeopapposaurus
A close relative of Massospondylus.

Aegyptosaurus
Guess...