Alternative combination: Chaoyangosaurus youngi
Synonym: Chaoyangosaurus liaosiensis Zhao and Cheng 1983 [replaced name]
Full reference: X. Zhao, Z. Cheng, and X. Xu. 1999. The earliest ceratopsian from the Tuchengzi Formation of Liaoning, China. Journal of Vertebrate Paleontology 19(4):681-697
Sister taxa: none
- Chaoyangsaurus youngi: IGCAGS V371, a partial skeleton
- Chaoyangosaurus liaosiensis: IGCAGS V371. Its type locality is Ershijiazi, Chaoyang, which is in a Tithonian/Valanginian fluvial mudstone in the Tuchengzi Formation of China.
Average measurements (in mm): skull length 140.0