Sellosaurus is a dubious genus of plateosaurid dinosaur that lived during the Late Triassic period, around 214 to 204 million years ago, in what is now Central and Northern Europe. Sellosaurus is a basal sauropodomorph dinosaur, a so-called "prosauropod". As of 2011, only one species is recognized: the type species S. gracilis from the lower Norian. However, others have been assigned in the past, and there is no broad consensus on the species taxonomy of plateosaurid dinosaurs. Similarly, there are a plethora of synonyms at the genus level. It is now recognized to be a synonym of Plateosaurus.