(Lizard from Wannan).
Named By: Hou – 1977.
Classification: Chordata, Reptilia, Dinosauria, Ornithischia, Cerapoda, Pachycephalosauria.
Species: W. yansiensis.
Size: Estimated 60cm long.
Known locations: China, Xiaoyan Formation.
Time period: Campanian of the Cretaceous.
Fossil representation: Skull fragment, part of left mandible, six vertebrae, part of ilium,femora, left and right tibia, left fibula, humerus.
Little is known about Wannanosaurus, but the skull specimen found appears to have been from a fully grown adult as the bones that make up the skull show signs of being fused together. Wannanosaurus is considered a primitive member of the pachycephalosaurs because it has a flat skull roof and enlarged openings when compared to other later pachycephalosaurs.