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The species Aardonyx celestae was found in 2009 in Early Jurassic deposits (Sinemurian-Plinsbachian stages) of South Africa. The excavation was conducted in the Elliot Formation in a place known as Marc's Quarry. Paleontologists were able to find a large number of bones and their fragments, which probably belong to two different individuals.

The taxon was named and described by a team of paleontologists led by Adam Yates in 2010. The genus name is derived from Afrikaans "aard" for land and Greek "onyx" for claw. The species is named after Celeste Yates, who discovered and prepared most of the first fossils of the species.

In its lifetime, the dinosaur was about 7 meters long. It had a long neck and a small head, resembling in appearance the head of typical sauropods - giant four-legged dinosaurs. It had characteristic forelimbs, which are intermediate between prosauropods and sauropods. The structure of the limbs indicates that the lizard preferred to move on four limbs, but was also able to walk on the back two. Analysis of the jaws revealed that A. celestae was a herbivore.

According to the researchers, the new species allows us to clarify the evolution of four-legged dinosaurs. At the same time, however, 200 million years ago, sauropods already lived on earth, so scientists believe that before them is a transitional link, which is a direct ancestor of the four-legged giants is not.