Species: gracilis WANG & LU, 2001
Etymology: Latin, gracilis, "slender." The species name reflects both the beautiful preservation and the tiny metatarsals of the holotype.
Holotype: IVPP V 11726
Locality: Locality 1 at Sihetun, Shangyuan, Beipiao, western Liaoning Province, China.
Horizon: Jiangshangou Member, Yixian Formation, Jehol Group.
Age: Barremain Stage, Lower Gallic Subepoch, Lower Early Cretaceous Epoch, Early Cretaceous.
Material: A nearly complete skeleton that contains a complete skull and pectral girdle, forelmbs, sternum, cervical, dorsal and metatarsals and digits.
JI, JI, LU, YOU & YUAN, 2006
Locality: Baitaigou village, northwest of the Yizhou town, Yixian County, Liaoning Province, China.
Horizon: Yixian Formation, Jehol Group.
Biostratigraphy: Psittacosaurus Fauna, Confuciusornis Avifauna.
Age: Valanginian Stage, Upper Neocomian Subepoch, Early Early Cretaceous Epoch, Early Cretaceous.
Number: Not given: