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meaning: "Arizona lizard"
Named By: Samuel Paul Welles in 1947
Time Period: Middle Triassic, 243 Ma
Location: USA, Arizona - Moenkopi Formation
Size: Most complete specimen estimated at around 3 meters long
Diet: Carnivore
Fossil(s): Two specimens, one of an almost complete individual that revealed the developed neural spines
Classification: | Chordata | Reptilia | Rauisuchia | Paracrocodylomorpha | Poposauroidea | Ctenosauriscidae |

Arizonasaurus was a ctenosauriscid archosaur from the Middle Triassic (243 million years ago). Arizonasaurus is found in the Middle Triassic Moenkopi Formation of northern Arizona. A fairly complete skeleton was found in 2002 by Sterling Nesbitt. The taxon has a large sailback formed by elongate neural spines of the vertebrae. The type species, Arizonasaurus babbitti, was named by Samuel Paul Welles in 1947.

Read more about Arizonasaurus at Wikipedia
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