Re: Yandusaurus multidens in SVP2003 abstracts

["Tim Williams" <twilliams_alpha@hotmail.com>]

T. Michael Keesey wrote:

> I'm not sure of the exact citation, but apparently there was a paper by 
> Knoll
> in 1999 naming _Proyandusaurus_ as a new genus for _Yandusaurus multidens_. 
> (It
> also names _Eugongbusaurus_ as a new genus name for _Gongbusaurus
> wucaiwanensis_).

The relevant abstract can be found at:

http://eavp.alettra.de/abstracts/4thEWVPabstract.pdf

Fabien Knoll regards _Gongbusaurus shiyii_ as a nomen dubium, but _G. 
wucaiwanensis_ as valid, thereby necessitating a new genus to receive the 
latter.

As stated in the abstract, Knoll also regards _Fabrosaurus australis_ as a 
nomen dubium, but upholds the validity of the family name Fabrosauridae.  
Unfortunately, it's both or neither; a family cannot be erected upon an 
indeterminate genus (or shouldn't be - though Ceratopsidae and 
Titanosauridae are probable exceptions to this rule.)

Jaime Headden wrote:

> This is based a lot on the absence of a single, strong vertical crest on 
> the teeth, and large secondary ridges, forming a continuous, crenellated 
> tooth margin appearing as scalloped clam valves. This feature
> occurs in *Muttaburasaurus,* *Tenontosaurus tillettorum* (but not *T. 
> dossi*), *Rhabdodon*
> and *Zalmoxes,* *Qantassaurus* and *Atlascopcosaurus.*

It just so happens that Pincemaille (1999 - another EWVP abstract) found 
that _Rhabdodon_ forms a clade with _Muttaburrasaurus_ and _Tenontosaurus_.

> *Q.* and *A.* differ only in relative tooth count with similar size, 
> otherwise they'd be specific
> synonyms.

Associated with the lower tooth count is the fact that the dentary of 
_Qantassaurus_ is significantly shorter than that of _Atlascopcosaurus_.



Tim

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