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Re: ceratopsian frills

Just out of curiosity, and forgive me if this is common knowledge, has 
the notion of temperature regulation been dumped with regard to these frills?


On Tue, 21 Mar 1995, Tom Holtz wrote:

> >Could ceratopsian frills have had any defensive value against insects,  which
> >tend to cluster around the hind ends of large animals but can do extensive
> >harm to ears and eyes if they can fly or crawl there to lay eggs?
> I don't think that would work - the eyes and ear openings are just as
> exposed in a ceratopsian as they are in other dinosaurs.  The frill is
> formed from the back of the skull, and thus isn't particularly associated
> with either the eyes or ears.
> The frill is properly placed for jaw muscle attachment, and would make a
> great display surface (two ideas previously mentioned).  I think it a fair
> statement that both these purposes may be behind the origin of the
> neoceratopsian frill.
> Thomas R. Holtz, Jr.                                 
> tholtz@geochange.er.usgs.gov
> Vertebrate Paleontologist in Exile                Phone:      703-648-5280
> U.S. Geological Survey                              FAX:      703-648-5420
> Branch of Paleontology & Stratigraphy
> MS 970 National Center
> Reston, VA  22092
> U.S.A.