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Re: Trike fights



In a message dated 96-01-25 22:54:11 EST, Robert.J.Meyerson@uwrf.edu (Rob
Meyerson) writes:

>I think so.  The only opening in the skull, at that region, is the ear.
>There
>doesn't appear to be any way that the jaw muscle could attach to the
>underside
>of the frill, so it had, IMHO, to attach to the upper frill (which is fairly
>well supported by other sources).  Simply put, there is no where for the
>muscle
>to go, except along the jugal and up to the frill.  If this is true,
>reconstructions of these animals, that portray the jugal as an extra set of
>horns, should be rethought (especially _Pentaceratops_).
>
>

You're forgetting about the supratemporal fenestrae, through which the jaw
muscles passed from the upside of the base of the frill down behind the outer
skull bones (postorbitals, jugals, etc.) to the mandible.