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Re: New member of the list/hadrosaurs

On Thu, 28 Sep 2000, [iso-8859-1] João Simões Lopes Filho wrote:

> 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. The more
Cretaceous dinosaurs that are uncovered from other areas besides Western
North America the more it seems that Titanosaurians were in place around
the globe. What we
really need is a good phylogenetic hypothesis of titanosaurian
relationships that indicates Alamosaurus is nested amongst the late
Cretaceous titanosaurs of South America. Though this may be a little way
off yet but current indications are that this isn't the case (Upcurch's
1998 paper in Z. J. Linn. Soc.). 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. 


Adam Yates