Wannanosaurus belongs to the family of basal pachycephalosaurian dinosaur that had been found existed in the Campanian-age Upper Cretaceous Xiaoyan Formation, over 80 million years ago. The fossil remains of the species were first discovered in Anhui, China. This herbivore species comes under the classification of Chordata, Reptilia, Dinosauria, Ornithischia, Cerapoda, Pachycephalosauria.

The species was first named and described by Lian-Hai Hou ‬in1977. From the identified fossil specimen it has been observed that the dinosaur was about 60cm long. Skull fragment, part of left mandible, six vertebrae, part of ilium,femora, left and right tibia, left fibula, humerus are the found fossil representation. From the analysis of found fossil representation it has been revealed that the species had a very small femur length of ~8 centimeters (3.1 in).

Initially the species was believed to be a member of the family Homalocephalidae. Scientists on proceeding with further researches came to the conclusion that this species belong to the pachycephalosaurian family which is solely an herbivore.

Wannanosaurus facts:

Name:	Wannanosaurus (Lizard from Wannan).
Phonetic:	Wan-nan-oh-sore-us.
Named By:	Hou – 1977.
Classification:	Chordata, Reptilia, Dinosauria, Ornithischia, Cerapoda, Pachycephalosauria.