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Re: Protoceratopsoid tails adapted for swimming



On 12/03/2013 10:40 PM, Ben Creisler wrote:
> From: Ben Creisler
> bcreisler@gmail.com
> 
> 
> A recent paper not yet mentioned on the DML:
> 
> V. S. Tereschenko & T. Singer (2013)
> Structural features of neural spines of the caudal vertebrae of
> protoceratopoids (Ornithischia: Neoceratopsia).
> Paleontological Journal 47(6): 618-630
> DOI: 10.1134/S0031030113060105
> http://link.springer.com/article/10.1134/S0031030113060105
> 
> 
> 
> The structure of caudal neural spines of protoceratopoids displays
> adaptation for aquatic and terrestrial mode of life. The increasing
> height of caudal neural spines in the series Leptoceratops,
> Udanoceratops, Protoceratops, Bagaceratops is connected with the
> extent of adaptation for swimming and changes in inclination of neural
> spines are connected with the mechanical balance of the lever. Thus,
> the anterior caudal vertebrae (1cd–15cd) of Protoceratops and
> Bagaceratops show an anticliny, which promotes extension (rise) of a
> heavy tail in terrestrial conditions. In the middle part of the tail
> (16cd–23cd), with the greatest height of neural spines, a decrease in
> width and increase in thickness counteract transverse loads
> accompanying movements on land. At the same time, the supraspinal
> ligament prevents divergence of neural spines caused by curvature of
> the tail as it is raised above the ground.
> 
> 


I'm not buying it.  You don't swim with a heavy boney collar wrapped
around your neck and head.  You go Kurplunt and drown.

Ruben