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Re: marginal differences



From: zone65 <zone65@telstra.com>

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 longer rostrum, open postfrontal fontanelle, and relatively long supraorbital horncores. She also characterized _T. prosus_ as having a short rostrum, closed postfrontal fontanelle, and relatively short supraorbital horncores. Lehman (1998) disagrees with Forster's 2 species conclusion, however, as he finds the differing morphs tend to fall within a "gradational spectrum of variation."


Jordan Mallon

Undergraduate Student, Carleton University
Vertebrate Paleontology & Paleoecology

Paleoart website: http://www.geocities.com/paleoportfolio/
AIM: jslice mallon

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