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Amargasaurus (was Re: Quaesitosaurus and Nemegtosaurus)
At 12:15 PM 12/12/96 -0500, Nick Longrich wrote:
>> I wonder then if _Antarctosaurus_, which has also been
>> reconstructed with a very diplodocoid-like skull, might be a
>> titanosauroid after all.
> Amargasaurus, however, is generally reconstructed as
>diplodocid, so that would argue that they were in S. America.
The possibility that Antarctosaurus (a late Late Cretaceous form) was a
titanosauroid does not change the observations that Amargasaurus (an early
Early Cretaceous form) was a dicraeosaurid diplodocoid. All recent studies
have placed Amargasaurus quite close to Dicraeosaurus.
>Then again, if Opisthocoelicaudia has cleft neural spines and
Peglike teeth are found in titanosauroids and in diplodocoids.
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
"To trace that life in its manifold changes through past ages to the present
is a ... difficult task, but one from which modern science does not shrink.
In this wide field, every earnest effort will meet with some degree of
success; every year will add new and important facts; and every generation
will bring to light some law, in accordance with which ancient life has been
changed into life as we see it around us to-day."
--O.C. Marsh, Vice Presidential Address, AAAS, August 30, 1877