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RE: Triceratops epoccipitals



Such a change is also characteristic of some extant turtles, often the
marginals  but also in the midline of the carapace in some species (both of
these in some of the Elseya dentata group of short-necked chelids in
Australia).  As turtle shell bones preserve clear growth lines, adults
should provide a good record of the allometry involved.

John
 
-----------------------------------------------
Dr John D. Scanlon
Palaeontologist, 
Riversleigh Fossil Centre, Outback at Isa
19 Marian Street / PO Box 1094
Mount Isa  QLD  4825
AUSTRALIA
Ph:   07 4749 1555
Fax: 07 4743 6296
Email: riversleigh@outbackatisa.com.au
http://tinyurl.com/f2rby


> -----Original Message-----
> From: Nick [mailto:nick.gardner@gmail.com]
> Sent: Sunday, January 14, 2007 7:55 PM
> To: DINOSAUR@usc.edu
> Subject: Triceratops epoccipitals
> 
> I was just recently skimming over Goodwin and Horner's paper from last
> year, and I was curious after reading the section on ontogeny and
> epoccipitals. After spending a short time talking about it with
> Mickey, I thought posting a query to the DML might not be a bad idea.
> 
> Does anyone know of similar cases in nature where pointed triangular
> shaped edges change to low and rounded edges as the animal matures and
> why it might happen? I don't think "wear-and-tear" is necessarily the
> best explanation for this..