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RE: Ichthyovenator

I'm not sure what is meant by "sinusoidal," but I'm sure that presuming 
similarity to *Concavenator corcovatus* on the given description isn't useful. 
"Sinusoidal" may instead refer to the shape of the sail as presumed for 
*Spinosaurus aegyptiacus,* with a sharp anterior upswing, followed by a gradual 
downswing in the profile.


  Jaime A. Headden
  The Bite Stuff (site v2)

"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)

"Ever since man first left his cave and met a stranger with a
different language and a new way of looking at things, the human race
has had a dream: to kill him, so we don't have to learn his language or
his new way of looking at things." --- Zapp Brannigan (Beast With a Billion 

> Date: Mon, 23 Apr 2012 09:55:39 -0700
> From: keesey@gmail.com
> To: dinosaur@usc.edu
> Subject: Re: Ichthyovenator
> On Sun, Apr 22, 2012 at 7:32 PM, Brad McFeeters
> <archosauromorph2@hotmail.com> wrote:
> >
> > I have not read the paper yet, but I wonder if a sinusoidal sail might 
> > actually be characteristic of female spinosaurids.  Having a gap in the 
> > sail above the pelvis might make it easier for the male to get his leg over 
> > the female when mounting her (picture spinosaurids in this position: 
> > http://www.luisrey.ndtilda.co.uk/html/carnsex.htm).  A somewhat similar 
> > condition is also seen in the type specimen of Concavenator, maybe a 
> > solution to the same problem.
> Interesting idea! Possibly Becklespinax altispinax as well?
> Hopefully we have enough specimens to test this some day.
> --
> T. Michael Keesey
> http://tmkeesey.net/