|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|
|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.