Species: hengdaoziensis JI, CHIAPPE & JI, 1999
Etymology: hengdaozi referres to the stratigraphic horizon where it was collected.
Holotype: National Geological Museum of China collection, GMV 2129-a/b
Locality: Jianghsangou village (~25 km south of Beipiao City), western Laioning Province, northeastern China.
Horizon: Hengdaozi Member, Chaomidianzi Formation, a newly established unit formerly regarded as the lower part of the Yixian Formation.
Biostratigraphy:
Age: Most likely Late Jurassic, although possibly earliest Cretaceous.
Material: Nearly complete specimen with feather impressions with 2 long tail feathers.