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Re: Torosaurus is Triceratops



MSU Press release:

http://www.montana.edu/cpa/news/nwview.php?article=8635

 ----------------------------------
Denver Fowler
df9465@yahoo.co.uk
http://www.denverfowler.com
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----- Original Message ----
From: Denver Fowler <df9465@yahoo.co.uk>
To: DML <dinosaur@usc.edu>
Sent: Tue, 13 July, 2010 13:17:14
Subject: Torosaurus is Triceratops

Paper is out in the new JVP: on the Taylor and Francis website:

http://www.informaworld.com/smpp/content~db=all~content=a924306967~frm=abslink


Torosaurus Marsh, 1891, is Triceratops Marsh, 1889  (Ceratopsidae: 
Chasmosaurinae): synonymy through ontogeny

John B. Scannella; John R. Horner

ABSTRACT
Although they have been considered distinct genera for over a century,  
ontogenetic analyses reveal that Triceratops and âTorosaurusâ  actually 
represent growth stages of a single genus. Major changes in  cranial 
morphologyâincluding the opening of parietal fenestrae and the  elongation of 
the squamosalsâoccur rapidly, very late in Triceratops ontogeny and result in 
the characteristic 'Torosaurus'  morphology. This report presents the results 
of 



a 10-year field study of  the dinosaurs of the Hell Creek Formation in Montana 
and is based on a  collection of over 50 specimens of Triceratops, including 
over 30  skulls, which have been amassed in that time, in addition to 
specimens  
from numerous other North American museums. This large sample of  individuals 
reveals the full ontogenetic spectrum of Triceratops.  The synonymy of 
Triceratops and 'Torosaurus' contributes  to an unfolding view of extremely 
reduced dinosaur diversity just before  the end of the Mesozoic Era



----------------------------------
Denver Fowler
df9465@yahoo.co.uk
http://www.denverfowler.com
-----------------------------------