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Re: Diplodocoidea vs. Diplodocimorpha
> Date: Tue, 11 May 2004 11:32:47 -0700
> From: "Mickey Mortimer" <Mickey_Mortimer111@msn.com>
>
> > My questions: can anyone tell me the reference for
> > Diplodocimorpha? And does anyone know who is responsible for the
> > narrower node-based definition of Diplodocoidea?
>
> Diplodocomorpha Calvo and Salgado, 1995
> Reference- Calvo, J.O. and L. Salgado. 1995. Rebbachisaurus tessonei
> sp. nov., a new Sauropoda from the Albian-Cenomanian of Argentina:
> new evidence on the origin of the Diplodocidae. Gaia 11: 13-33.
Thanks, Mickey, this is really helpful. (BTW., I assume that
"DiplodocOmorpha" here and elsewhere in your message is a typo for
"DiplodocImorpha"?)
> Diplodocoidea was named by Upchurch (1995) for his nemegtosaurid +
> dicraeosaurid + diplodocid clade. I don't know if he defined it, my
> copy is at home.
I'll check again, but I skimmed this paper last night, and didn't see
any clade definitions in it.
> Rebbachisaurids were not considered a distinct primitive clade yet,
> as Rayososaurus tessonei had yet to be described. Once it was,
> Calvo and Salgado (1995) continued using Diplodocoidea for the more
> restricted clade, and created Diplodocomorpha for the more inclusive
> clade of (Rayososaurus tessonei + Diplodocus longus) (modified).
Aha! Well, I think that's _equivalent_ (according to current
phylogenies) to the Dinosauricon definition of Diplodocimorpha =
{Diplodocus > Saltasaurus}, but it's a very different definiton. So
that's Diplodocoidea sensu Calvo & Salgado, but I still need to track
down the author of the Dinosauricon's definition.
> I'm not sure if they defined both clades either (I don't have that
> paper), though the commentary in Glut (2000) suggests they at least
> defined Diplodocomorpha as (Rebbachisaurus + Diplodocidae).
Ah yes, Glut ... The next best thing to primary literature! Thanks
for pointing me back to that. I followed the link from his
_Rayosaurus_ entry into the Systematics chapter, and found this on
page 87:
Hunt et al. stated that similar cranial features
shared by diplodocids and dicraeosaurids may suggest
that these two groups together make up a monophyletic
"superfamily" Diplodocoidea.
So I think that's the reference for that name:
Hunt, A. P., M. G. Lockley, S. G. Lucas and
C. A. Meyer. 1994. The global sauropod fossil
record. Gaia 10:261-279.
(Man oh man, how _did_ people cope before the Internet and the Glut
encyclopaedias? :-)
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/o ) \/ Mike Taylor <mike@indexdata.com> http://www.miketaylor.org.uk
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