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Psittacosaurus (was Re: Some questions & feathered Allosaurs?)




Simon M. Clabby <dinowight@yahoo.co.uk> wrote:

Also, I was under the impression that Psittacosaurs
were considered by some workers to not bee ancestral
to Neoceratopians,

_Psittacosaurus_ is the sister taxon to the Neoceratopsia. You're certainly right in saying that it was not directly ancestral to neoceratopsians: as well having derived characters that preclude it from being ancestral to neoceratopsians, the genus _Psittacosaurus_ also lived too late in time. But it (and _Chaoyangsaurus_) are the closest known relatives of the neoceratopsians.


Hope that helps.



Tim

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