[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

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

Add photos to your messages with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail