Genus: Psittacosaurus OSBORN, 1923
Etymology: Greek, psittakos, “parrot” and Greek, sauros, “lizard”: “Parrot-beaked lizard”.

Species: mongoliensis OSBORN, 1923
Etymology:

Holotype: AMNH 6254

Locality: Red Mesa, Bogdo Basin, Mongolia.

Horizon: Ohshih Formation.

Biostratigraphy:

Age: Aptian-Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Referred material:

SERENO, 1987

AMNH 6544: Fragmentary skeleton including the right jugal, right postorbital, left quadrate, left pterygoid, right dentary, and right articular, postcrania including a fragmentary vertebral column, right and fragmentary left scapulae, right coracoid, right and left humeri, partial right and left carpus and manus, and right and left hind limbs lacking the right lateral distal tarsal, left medial distal tarsal, left digits I and IV, and right and left metatarsal 5, and associated gastroliths.

 

= Psittacosaurus cf. P. mongoliensis DONG, 2003

STEGHAUS-KOVAC, 2002, MAYR, PETERS, PLODOWSKI, & VOGEL, 2002

Locality: Unknown, possibly from Sihetung near Beipiao City, Liaoning Province, China.

Horizon:

Biostratigraphy:

Age: Early Cretaceous.

Material:

SMF R 4970: Nearly complete specimen.
Note: Has long filaments on the tail.

Note: Has gastroliths.

 

= Protiguanodon mongoliense OSBORN, 1923
= Psittacosaurus protiguanodonensis YOUNG, 1958
Etymology:

Holotype: AMNH 6253

Locality: Mount Ussuk, Tsagan Nor Basin, Hovd Province, Mongolia.

Horizon: Ondai Sair Formation.

Biostratigraphy:

Age: Aptian-Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: Fragmentary skull, dentary, and skeleton.

Note: 112 gastroliths were found.

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Species: mazongshanensis XU, 1997

Holotype: IVPP V 12165

Locality: Mazongshan, Gansu (Kansu) Province, China.

Horizon: Xinminabo Group.

Biostratigraphy:

Age: Early Cretaceous.

Material: Fragmentary skull, associated cervical, dorsal and sacral vertebrae, and a forelimb, with gastroliths.

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Species: gobiensis SERENO, ZHAO & TAN, 2010 (published in 2009)
Etymology: Gobi, after the Gobi Desert and Latin, -iensis, belonging to.

Holotype: LH PV2

Locality: Suhongtu, 40°59'42.4"N, 104°3'53.8"E, nei Mongol autonomous Region, Inner Mongolia, China.

Horizon: Bayan Gobi Formation.

Biostratigraphy:

Age: Aptian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: Skull and articulated postcranial skeleton.

Note: Has gastroliths.