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Re: Abydosaurus mcintoshi, a new sauropod from the Albian of Utah
On 25 February 2010 13:03, Thomas R. Holtz, Jr. <firstname.lastname@example.org> wrote:
> Tim Williams wrote:
>> Mike Taylor <email@example.com> wrote:
>> The discovery of _Abydosaurus_ might actually have provided a good
>> opportunity to test the monophyly of _altithorax_+_brancai_. Instead,
>> this monophyly was simply assumed by Chure &c, and _altithorax_+_brancai_
>> were therefore treated as a single OTU (_Brachiosaurus_) in the
>> phylogenetic analysis.
>> Also, as mentioned by Mike, _altithorax_ is from the Morrison, and
>> _brancai_ is from the Tendaguru. Thus, I would have thought that lumping
>> the two into a single genus would require compelling morphological
>> evidence. This isn't the case. IMHO, Taylor (2009) established a strong
>> case for treating _brancai_ as a separate genus (_Giraffatitan_). It's
>> only historical tradition that's holding the two together. If Janensch
>> had *not* referred _brancai_ to _Brachiosaurus_, but had instead erected a
>> separate genus, we wouldn't be having this discussion.
> I would be seriously interested in seeing Lusotitan, Europasaurus,
> Sauroposeidon, Paluxysaurus, and Astrodon thrown into the mix!
There are at least two separate groups, on two different continents,
actively working on basal titanosauriform phylogeny right now --
possibly three if a long-delayed project is now off the ground. And
that is not counting Paul Upchurch's in-progress super-giant analysis
of Sauropodomorpha, which is well larded with putative brachiosaurs.
It's an exciting time to be working on the world's greatest clade.
(NO, Tom, NOT Tyrannosauridae!)
> Thomas R. Holtz, Jr.
> Email: firstname.lastname@example.org Phone: 301-405-4084
> Office: Centreville 1216
> Senior Lecturer, Vertebrate Paleontology
> Dept. of Geology, University of Maryland
> Fax: 301-314-9661
> Faculty Director, Earth, Life & Time Program, College Park Scholars
> Faculty Director, Science & Global Change Program, College Park Scholars
> Fax: 301-314-9843
> Mailing Address: Thomas R. Holtz, Jr.
> Department of Geology
> Building 237, Room 1117
> University of Maryland
> College Park, MD 20742 USA