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Re: Albertosaurus/Gorgosaurus (Re: Re: allosaur furcula)
At 06:33 PM 6/7/97 -0700, DinosØMP wrote:
>Thomas R. Holtz, Jr. wrote:
>> (And, before someone asks the question again: YES, Gorgosaurus does seem to
>> be a valid taxon, distinct from Albertosaurus, on both gradistic and
>> cladistic grounds).
>OK. Now I'm getting confused....
The short form: Anytime you see a skeleton or picture of "Albertosaurus"
libratus, it is really Gorgosaurus libratus.
On the very, very rare occasion (outside of Canada) that you see a skeleton
or picture of Albertosaurus sarcophagus (or A. arcunguis, if it is indeed
different), it is really Albertosaurus.
We know a LOT more about Gorgosaurus, since there are a lot more fossils of it.
The shorter form: Chances are, when you see something labelled
"Albertosaurus", it is really Gorgosaurus.
>If anyone does have the book The
>Illustrated Encyclopedia of Dinosaurs, bu Dr. David Norman. In the
>tyrannosaurid pages-the drawing of a juvenile Albertosaur,
That particular drawing is NOT based on any real specimens (more's the
pity), but is an extrapolation of what a small Gorgosaurus libratus would
>and the photo
>of a Albertosaurus eating a ceratopid...Is it REALLY albertosaurus???
I'm not sure of the particular specimen (for example, if that skull really
came with that body: a long-standing problem with dinosaur mounts), but it
looks to be Gorgosaurus libratus.
>And there is allso a skeleton of a "Gorgosaurus" laying in a dried
>position-lacking the tail (I think it is at the Smithsonian Institute) is
>that REALLY Gorgosaurus?
That one is Gorgosaurus, yes. (And it is a Smithsonian specimen).
Thomas R. Holtz, Jr.
Vertebrate Paleontologist Webpage: http://www.geol.umd.edu
Dept. of Geology Email:email@example.com
University of Maryland Phone:301-405-4084
College Park, MD 20742 Fax: 301-314-9661