Genus: Protarchaeopteryx JI & JI, 1997
Etymology: Greek, protos, "First, or earliest form of" + Archaeopteryx.
= Incisivosaurus XU, CHENG, WANG & CHANG, 2002
Etymology: Latin, incisivi, "incisor" for its large front teeth, and the Greek, sauros, "lizard."

Species: robusta JI & JI, 1997
Etymology: Latin, robustus, "robust, strong."

Holotype: NGMC 2125

Locality: Sihetun, Shangyuan, Beipiao City, western Liaoing Province, northeastern China.

Horizon: Horizon 1, Lower part of the Yixian Formation (Jiulongsong Member of Chaomidianzi Formation), Jehol Group.

Biostratigraphy: Psittacosaurus Fauna, Confuciusornis Avifauna.

Age: Valanginian Stage, Upper Neocomian Subepoch, Early Early Cretaceous Epoch, Early Cretaceous.

Material: Fragmentary skull and fragmentary skeleton with feather impressions.

Note: Has furcula.

Note: WANG, WANG, WANG, XU, TANG, ZHANG, HU, GU & HAO, 1998 has the horizon as follows

Horizon: Yixian Formation, third member, grey, grayish-black, grayish-white shale with light yellow sandstone, siltstone, silty mudstone and more than 10 layers of light yellow tuffite, tuffaceous sandstone and mudstone, Early Cretaceous.

Referred material:

AZUMA, 2005

JI-2: Cast of type.

= Incisivosaurus gauthieri XU, CHENG, WANG & CHANG, 2002
Etymology: In honor of Jaques Gauthier for his contribution to theropod dinosaurs.

Holotype: IVPP V13326

Locality: Lujiatung, Shangyuan, Beipaio City, Liaoning Province, China.

Horizon: Horizon 1, Lower part of the Yixian Formation, Jehol Group.

Biostratigraphy: Psittacosaurus Fauna, Confuciusornis Avifauna.

Age: Valanginian Stage, Upper Neocomian Subepoch, Early Early Cretaceous Epoch, Early Cretaceous.

Material: An almost complete skull and a partial cervical vertebra.