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RE: The position of tyrannosaurs (was Re: Armour Symposium Recollections)
> From: email@example.com [mailto:firstname.lastname@example.org]On Behalf Of
> In a message dated 5/14/01 3:26:54 PM EST, email@example.com writes:
> << Please note that Olshevsky's "tyrannosauroid implosion" represents
> Dinogeorge's accepting taxonomic decisions many of the rest of us agreed
> upon since the late 1990s, via Thom Carr's work and others. >>
> Well, most of you people still think Albertosaurus is three genera rather
> than just one with three species (not a terribly big deal, but
> part of the
> implosion nonetheless). And for some reason many of you still
> want to include
> Tarbosaurus within Tyrannosaurus, even though there is a lot more
> morphodistance between Tarbo and Tyranno than there is among the three
> Alberto "genera."
These are matters of generic synonymy rather than phylogenetic affinity:
i.e., taste rather than position. There still doesn't exist a
"genericometer" or some other test to demonstrate when two species should be
grouped in the same genus rather than split. However, I and Currie and
Brochu (at least) all use _Tarbosaurus_ now, and Chris and Thom Carr use
In reality, we've all converged (in terms of phylogenetic position, if not
generic taxonomy) on Greg Paul's 1980s version, anyway...
> And why was Aublysodontidae/Shanshanosauridae
> still showing
> as a separate group in the year 2001 at the Tom Holtz
> tyrannosaurid website
> (part of Tree of Life)?
That is based on work to be published shortly, but written in 1999. Thom
Carr & Tom Williamson's work since put paid to the Kirtland Shale
"aublysodontine" (to be fair, though, I do point out the shared similarity
in the orbital region...).
> The more interesting paradigm shift for me presently is removing the
> pterosaurs from Archosauria and reclassifying them as derived
>I think Dave Peters has nailed this one.
I agree with that wholeheartedly!!
Thomas R. Holtz, Jr.
Department of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
College Park, MD 20742
Phone: 301-405-4084 Email: firstname.lastname@example.org
Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-405-0796