There has been over 20 almost complete Sellosaurus fossil skeletons found making this a more popular dinosaur. All fossil discoveries were in Germany. Many of the regions include the Lowenstein Formation and the Keuper Formation of Baden-Wurttemberg. Fossils of another dinosaur now named Efraasia were found and once thought to be Sellosaurus, but it was proven that they were a new breed.

The Sellosaurus classification is Saurischia, Sauropodomorpha, Prosauropoda, Plateosauridae. The dinosaur was described by Huene in 1908.

This herbivore was much like many primitive Plateosaurus. It was about 6.5 meters long with strong legs. Also it had a sharp thumb claw which was mostly likely used for defense.