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Re: New member of the list/hadrosaurs




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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