Researchers at the Natural History Museum have said a set of fossils stored for decades could be the earliest known dinosaur to walk the Earth.
The specimen was first studied by former curator Alan Charig in the 1950s during his PhD, but he died before his work was published.
Scientists have now identiified the Nyasasaurus Parringtoni fossils as most likely coming from a dinosaur that lived about 245 million years ago.
This is 10 to 15 million years earlier than any previously discovered species.
It is believed to have been the size of a Labrador dog with a tail more than a metre long.