Jolagia

Jolagia was an early armored dinosaur that was possibly related to Stegosaurs and Ankylosaurs, but were not the ancestors of them. Depending on a species, they ranged from the size of a Compsognathus to the size of a large massospondylus. They filled the similar niche to Prosauropods, since they have a similar body plan and diet to Prosauropods. They lived in what is now Nevada and California during the Early Jurassic. They might have went extinct possibly due to competition for food from Prosauropods that arrived in their habitats.