Re: Doswellia, Eoraptor

[Tim Williams <twilliams_alpha@hotmail.com>]

David Marjanovic wrote:

> > But note that Turfanosuchus, at the base of the Archosauria, somehow has 
> > them.
>
> It is close to but outside the crown-group, so more or less expected to 
> have them.

Yep.  If Archosauria is restricted to the crown-group, as proposed by 
Gauthier (1986), then _Turfanosuchus_ is probably not an archosaur.  It is 
an archosauriform though.  The crocodile-normal ankle joint in 
_Turfanosuchus_ appears to be convergent with the suchian lineage (Wu et 
al., 2001; Wu & Russell, 2001; contra Parrish, 1993).  As a non-archosaurian 
archosauriform, the presence of pterygoid teeth in _Turfanosuchus_ is not 
surprising.  Palatal teeth are also present in _Euparkeria_ and the 
proterochampsids.


Gauthier J.A. (1986). Saurischian monophyly and the origin of birds.  
Memoirs of the California Academy of Science. 8: 1?55.

Parrish M.J. (1993). Phylogeny of the Crocodylotarsi, with reference to 
archosaurian and crutotarsan monophyly. Journal of Vertebrate Paleontology. 
13: 287?308.

Wu X.-C., Liu J. & Li J.-L. (2001). The anatomy of the first archosauriform 
(Diapsida) from the terrestrial Upper Triassic of China.  Vertebrata 
PalAsiatica 39:252 -264.

Wu, X-C & A.P. Russell (2001). Redescription of _Turfanosuchus dabanensis_ 
(Archosauriformes) and new information on its phylogenetic relationships. 
Journal of Vertebrate Paleontology 21: 40-50.