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On Sun, Apr 22, 2012 at 7:32 PM, Brad McFeeters
> 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