@INCOLLECTION{TreeBASE2Ref21147, author = {Paul C. Sereno}, title = {Taxonomy, cranial morphology, and relationships of parrot-beaked dinosaurs.}, year = {2010}, keywords = {}, doi = {}, url = {http://}, pmid = {}, booktitle = {New Perspectives on Horned Dinosaurs.}, isbn = {}, publisher = {University of Indiana Press}, address = {Bloomington}, editor = {}, pages = {21--58}, abstract = {In 1922, well-prserved fossils of the first parrot-beaked dinosaur were discovered in Early Cretaceous horizons in the Gobi Desert of Mongolia. Now referred to a single species, Psittacosaurus mongoliensis, these remains include a growth series from hatchlings to adults. In subsequent years, 15 species have been added to the genus Psittacosaurus and a second genus, Hongshanosaurus, was recently described, all from Early Cretaceous rocks in Asia. Although the second genus and about one-half of the species attributed to Psittacosaurus are potentially invalid, Psittacosaurus remains the most species-rich dinsaurian genus, with interspecific variation concentrated in the skull and dentition. This paper reviews evidence differentiating the named genera and species of psitacosaurs, outlines major cranial changes in a growth series from hatchling to adult in Psittacosaurus mongoliensis, and provides evidence of two species groups within the genus. } }

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