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Re: marginal differences
From: zone65 <firstname.lastname@example.org>
How do the two species of Triceratops differ? Again, it's not just a matter
of splitting hairs?
Forster (1996) characterized _Triceratops horridus_ as having a long
rostrum, an open postfrontal fontanelle, and relatively long supraorbital
horncores. She characterized _T. prosus_ as having a short rostrum, a
closed postfrontal fontanelle, and relatively short horns. As Lehman (1998)
argues, however, these two morphs span "a gradational spectrum of variation"
and thus there is likely only one valid species of _Triceratops_, he
Undergraduate Student, Carleton University
Vertebrate Paleontology & Paleoecology
Paleoart website: http://www.geocities.com/paleoportfolio/
AIM: jslice mallon
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