[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: _Neovenator_

 >         _Neovenator's_ ilium looks a heckuva lot like the ilium of
 > _Metriacanthosaurus_!  Specifically, they both have a sharply angled
 > postacetabular process.
 I took a look at Steve Hutt et al.'s paper last night and, gadzooks, 
 you're right.  Unfortunately the ilium (or what's preserved of it) is 
 only shown in the reconstruction of the entire skeleton, and is not 
 individually figured.  Still, this part of the ilium is similar.
 >         Further investigation of _Stokesosaurus_, which I have previously
 > suggested had a similar hip, shows that the ilium of that taxon only appears
 > to have the sharply angled postacetabular process when the ilium is viewed
 > at a slight angle (as the lower picture in Madsen 1976 shows).  
 I have _Stokesosaurus_ pegged as a possible Late Jurassic 
 tyrannosaurid.  A tyrannosaurid-like braincase from Cleveland-Lloyd 
 quarry has been tentaively referred to this beastie.  Wait and see.
 Tim Williams

> > character has also been attributed by Paul (_PDW_, 1988) to
> > _Yangchuanosaurus_, but _Y. magnus_ does not exhibit this condition, I have
> > yet to see a photo of _Y. shanyouenensis_ [sic], and the smaller species is
> > said to have a "distorted" ilium.  Indeed, Currie and Xiao [sic?] (1993)
> > suggest that the ilium of _Yangcuanosaurus_ is incorrectly restored, based
> > on the ilium of _Sinraptor_.  Considering the differences in the pelvi of
> > _S. dongi_ and _Yangchuanosaurus_, this statement is perhaps premature, but
> > for now the character is at least undiscernable in the latter taxon and
> > absent in the former.
> >         This suggests that this condition is a synapomorphy which links
> > _Metriacanthosaurus_ and _Neovenator_.  The vertebral spines of the latter
> > taxon are somewhat (around 20%?) lower than the former, and they are
> > different in other aspects, but of course it is not the differences which
> > concern us.  Tthis does suggest that least three seperate groups of
> > allosauroids (Sinraptoridae, Charcarodontosauridae, and Allosauridae) had
> > high-spined and low-spined morphs.
> > 
> >         Wagner
> > +--------------------------------------------------------------------------+
> > | Jonathan R. Wagner            "You can clade if you want to,     |
> > | Department of Geosciences      You can leave your friends behind |
> > | Texas Tech University          Because your friends don't clade  |
> > | Lubbock, TX 79409               and if they don't clade, |
> > |   *** wagner@ttu.edu ***       Then they're no friends of mine." |
> > |       Web Page:  http://faraday.clas.virginia.edu/~jrw6f         |
> > +--------------------------------------------------------------------------+
> > 
> >