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

Species: mongoliensis OSBORN, 1923
Etymology:

Referred material:

COOMBS, 1980, 1982

Locality: Type locality of Psittacosaurus mongoliensis, Artsa Bogdo basin, Ööshinn Nuur (Oshih Basin), Northern Gobi, Mongolia.

Horizon: Oshih Formation.

Biostratigraphy:

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

Material:

AMNH 6536: Almost complete skull and jaws with numerous distarcticulated postcranial elements including cervical, dorsal and caudal vertebrae, ribs, scapulae, coracoid, partial ilium and ischium, humeri, femora, tibiae, fibulae and an almost complete pes of a baby. The postcranial material belongs to several individuals (there are fourteen distal ends of tibiae) of at least two different sizes. Rather than allot separate numbers to every element, all of the postcranial material is arbitrarily assigned to AMNH 6536.
Note: Furcula.

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Species: sinensis YOUNG, 1958
Etymology:

Holotype: IVPP V738

Locality: Hill slope N.W. of Toushan Village about 5 km N.W. of the Laiyang City, Shandong (Shantung) Province, China.

Horizon: Qingshan (Upper Chinshan Beds in the dark red clay) Formation.

Biostratigraphy:

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

Material: Skull, dentary and nearly complete skeleton.
Note: With a furcula.