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Re: synonymous sauropods?

Tim Donovan (msdonovan66@hotmail.com) wrote:

<The recent discovery of tracks which match the pes of O. skarzynskii in
the Central Sayr, close to the site that yielded the type skull of N.
mongoliensis, suggests the two are the same. So does the discovery of
opisthocoelous caudals in the nearby Western Sayr.>

  Both taxa are found in the same sediments, so this is not surprising;
however, this is not evidence of synonymy. Though it is brief,
phylogenetic analysis and independant assessments of *Opisthocoelicaudia*
and *Nemegtosaurus* show the former is a very, ver saltasaurine-like
animal, and the latter close to *Rapetosaurus*, and indeed not synonymous
with *Quaesitosaurus*.

  Fun stuff.

  Refs are:

Calvo, J.O.; Salgado, L.; and Coria, R.A. 1998. Neuva reconstruccion del
craneo de *Nemegtosaurus mongoliensis*, Nowinski, 1971 (Sauropoda) [New
reconstruction of the head of *Nemegtosaurus mongoliensis*, Nowinski, 1971
(Sauropoda)]. _Acta Geologica Lilloana 18(1): 156-157. [short paper]

Curry-Rogers, K. & Forster, C.A. 2001. The last of the dinosaur titans: a
new sauropod from Madagascar. _Nature_ 412: 530-534.

Salgado, L. and Coria, R.A. 1993. Consideraciones sobre las relaciones
filogeneticas de *Opisthocoelocaudia skarzynskii* (Sauropoda) del Cretacio
superior de Mongolia [Considerations on the phylogenetic relations of
*Opisthocoelocaudia skarzynskii* (Sauropoda) from the Upper Cretaceous of
Mongolian]. _Ameghiniana_ 30(3): 339. [abstract]


Jaime A. Headden

  Little steps are often the hardest to take.  We are too used to making leaps 
in the face of adversity, that a simple skip is so hard to do.  We should all 
learn to walk soft, walk small, see the world around us rather than zoom by it.

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