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Re: Bird brains and reproductive organs: clues to dinosaur behavior and anatomy?
Oh look, the bird penis paper was an "early release." :)
----- Original Message -----
> From: Ben Creisler <email@example.com>
> P. L. R. Brennan & R. O. Prum ("2011")
> The erection mechanism of the ratite penis.
> Journal of Zoology (advance online publication)
> DOI: 10.1111/j.1469-7998.2011.00858.x
> The erection mechanism of the penis in most vertebrates is blood vascular. A
> major evolutionary transition occurred in birds, where the erection mechanism
> changed from blood vascular to lymphatic. Within birds, however, the erection
> mechanism of the ratite penis has remained unknown. Early work suggested that
> the erection mechanism in ostrich Struthio camelus was blood vascular while
> description existed for the emu Dromaius novaehollandiae or the rhea Rhea
> americana. Because the penis in all other described birds has a lymphatic
> erection mechanism, clarifying that the erection mechanism of ratites is of
> great importance to understanding one of the major evolutionary transitions
> penis morphology within amniotes. Here, we show that the erection mechanism
> ratites is lymphatic, confirming that the evolutionary transition to
> erection occurred in the last common ancestor of Aves.
> News story:
> Ostrich penis clears up evolutionary mystery