RE: Opisthocoelicaudia (was Re: Titanosaurids)

["Williams, Tim" <TiJaWi@agron.iastate.edu>]

Dinogeorge@aol.com wrote:

>But nevertheless I remain quite unconvinced that 
>Opisthocoelicaudia is a titanosaur. Rather, O. seems to occupy the same
>place (based on postcrania) that Nemegtosaurus occupies (based on cranial
>material) in the sauropod cladogram, and it's very likely that O. and N.
>are synonymous. Any titanosaur characters in O. are likely the result of 
>convergence or chance.

In his follow-up post, George will of course present the results of his own
phylogenetic analysis that led him to this conclusion...   ;-)

By the way, I thought _Nemegtosaurus_ *was* a titanosaur - in recent
publications, only Upchurch (who puts it in the Diplodocoidea) seems to be
holding out.



Tim