Re: PACHYRHINOSAUR LINEAGE

["Tim Williams" <T.Williams@cclru.randwick.unsw.edu.au>]

>      Also, in the Nature paper, _Einiosaurus_ and _Achelousaurus_, not yet 
> named, were referred to as "transitional taxa B & C".  What is 
> "transitional taxa A"?  It has a _Styracosaurus_ like skull, but only two 
> parietal spikes, like _Achelousaurus_ and _Einiosaurus_.    

I read the _Nature_ paper, and yes there were three taxa.  I'm 
assuming taxon A is a species of _Styracosaurus_ (but I wondered 
about that too).  Which one (_Achelou_ or _Einio_) has the nose-horn 
that curves over onto the premaxillae?