Re: Trike fights

["Nicholas R. Longrich" <longrich@phoenix.Princeton.EDU>]

On Fri, 26 Jan 1996, Rob Meyerson wrote:

> Is it possible that _Psittacosaurus_ had a series of jaw muscles; one set that
> went through the head, and up to the frill; and a set that went outside the 
> jaw?
> In the case of T-tops, it would only mean that the outer muscle took control 
> of
> chewing.  OTOH, since T-tops evolved from short frilled ceratopians, it could 
> be
> that this is a characteristic of the group.

        I'm not totally clear on what was intended by "short-frilled 
ceratopians"- Chasmosaurines and Centrosaurines both would have had 
short-frilled ancestors, but Triceratops is now undisputedly a 
chasmosaurine ("long-frill") ceratopian. 
        -nick L.