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Re: Sexual dimorphism in tails of two oviraptorosaur dinosaurs? (free pdf)

So they used "Ajancingenia" ...

On Tue, Mar 31, 2015 at 7:45 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
> A new paper in open access:
> W. Scott Persons IV,  Gregory F. Funston, Philip J. Currie &  Mark A.
> Norell (2015)
> A possible instance of sexual dimorphism in the tails of two
> oviraptorosaur dinosaurs.
> Scientific Reports 5, Article number: 9472
> doi:10.1038/srep09472
> http://www.nature.com/srep/2015/150328/srep09472/full/srep09472.html
> The hypothesis that oviraptorosaurs used tail-feather displays in
> courtship behavior previously predicted that oviraptorosaurs would be
> found to display sexually dimorphic caudal osteology. MPC-D 100/1002
> and MPC-D 100/1127 are two specimens of the oviraptorosaur Khaan
> mckennai. Although similar in absolute size and in virtually all other
> anatomical details, the anterior haemal spines of MPC-D 100/1002
> exceed those of MPC-D 100/1127 in ventral depth and develop a hitherto
> unreported “spearhead” shape. This dissimilarity cannot be readily
> explained as pathologic and is too extreme to be reasonably attributed
> to the amount of individual variation expected among con-specifics.
> Instead, this discrepancy in haemal spine morphology may be
> attributable to sexual dimorphism. The haemal spine form of MPC-D
> 100/1002 offers greater surface area for caudal muscle insertions. On
> this basis, MPC-D 100/1002 is regarded as most probably male, and
> MPC-D 100/1127 is regarded as most probably female.

Jaime A. Headden
The Bite Stuff: http://qilong.wordpress.com/

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