Re: New member of the list/hadrosaurs

["Timothy Williams" <twilliams_alpha@hotmail.com>]

Adam Yates wrote (in reply to João Simões Lopes Filho):

> > North AMerican Alamosaurus seems to be an immigrant from South America,
> > where Titanosaurs were common.
>
> This is an appealing and simple idea but it might be wrong. [snip] 
> Titanosaurs have recently been found in
> the lower Cretaceous of North America so it is entirely possible that
> Alamosaurus is part of an endemic North American lineage of titanosaurs.

_Alamosaurus_ could indeed be a home-grown titanosaur.  Also, there is 
evidence (I picked this up in the NMMNH volume) that the combined 
_Alamosaurus_ material from the SW US may represent more than one 
titanosaurid taxa.

As for the global record of titanosaurs (i.e. Titanosauria), Molnar recently 
referred the Australian sauropod _Austrosaurus_ to the group.  This means 
every continent except Antarctica has a record of mid or late Cretaceous 
titanosaurs.


Tim

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