Describer

Russell & Zhao, 1996

Time

Cretaceous Early

Classification

Ornithischia Genasauria Cerapoda Marginocephalia Ceratopia Neoceratopia Psittacosauridae

Diet

Herbivore

Fossilsite

Ejinhoro Formation, Ordo region, Inner Mongolia, China

Fall Under

Psittacosaurus

Info

Psittacosaurus (Osborn, 1923) = Protiguanodon (Osborn, 1923)
Psittacosaurus > Psittacosaurus guyangensis (Cheng, 1983)
Psittacosaurus > Psittacosaurus mongoliensis ( Osborn, 1923) = Psittacosaurus protiguanodonensis (Young, 1958) > Protiguanodon mongoliensis ( Osborn, 1923)
Psittacosaurus > Psittacosaurus osborni (Young, 1931) > Psittacosaurus tingi (Young, 1931)
Psittacosaurus > Psittacosaurus sinensis (Young, 1958) > > Psittacosaurus youngi (Chao, 1962)
Psittacosaurus > Psittacosaurus meileyingensis (Sereno, Chao, Cheng & Rao, 1988)
Psittacosaurus > Psittacosaurus xinjiangensis (Sereno & Chao, 1988)
Psittacosaurus > Psittacosaurus neimongoliensis (Russell & Zhao, 1996)
Psittacosaurus > Psittacosaurus mazongshanensis (Dong & Azuma, 1996)
Psittacosaurus > Psittacosaurus ordosensis (Russell & Zhao, 1996)
Psittacosaurus > Psittacosaurus lujiatunensis (Zhou, Gao, Fox, and Chen, 2006)
Psittacosaurus > Psittacosaurus sibiricus (Averianov, Voronkevich, Leshchinskiy, Fayngertz, 2006)
Psittacosaurus> Psittacosaurus major - (Sereno, Zhao, Brown and Tan 2007)
Psittacosaurus> Psittacosaurus gobiensis (Sereno, Zhao & Tan 2010)

Diagnosis

Two pits on maxilla; jugal horn prominent, groove on ventral surface of jugal; eminence on caudal frontal; posterodorsal corner of skull depressed; squamosal therefore being positioned below level of central body of postorbital; acute angle between two planes of lateral aspect of jugal; former much smaller than latter. (Xu and Zhao, 1999)