[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Jeholornis: Two-Tailed Wonder

From: Ben Creisler

Many thanks to Jason for posting the new Jeholornis paper.

Note some additional information:

Free supplementary pdf with photos:


News stories:


On Mon, Oct 7, 2013 at 6:44 PM, Jason Brougham <jaseb@amnh.org> wrote:
> News today of a more proximal tail fan in Jeholornis:
> Jingmai O’Connor, Xiaoli Wang, Corwin Sullivan, Xiaoting Zheng, Pablo Tubaro, 
> Xiaomei Zhang, and Zhonghe Zhou
> Unique caudal plumage of Jeholornis and complex tail evolution in early birds 
> PNAS 2013 ; published ahead of print October 7, 2013, 
> doi:10.1073/pnas.1316979110
> We describe the presence of essentially two functional tails in the Early 
> Cretaceous Jeholornis (the second most primitive bird)—one like that of some 
> modern birds with a fan-shaped tract of feathers over the proximal tail 
> vertebrae and another distal frond like that of feathered dinosaurs such as 
> Caudipteryx and Microraptor. We suggest that the unique “two-tail” plumage in 
> Jeholornis probably evolved as the result of complex interactions between 
> natural and sexual selective pressures and served both aerodynamic (flight 
> and balance, etc.) and ornamental functions (communication/display, etc.). 
> Our aerodynamic analysis also provides a plausible functional explanation for 
> the elongation of the boney tail in Jeholornis relative to Archaeopteryx.
> http://www.pnas.org/content/early/2013/10/02/1316979110.abstract?sid=8ba0510d-473b-46ef-9aa7-b4dcf8d88096