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Re: Ornithomimus with feathers from Upper Cretaceous of Alberta

A news story:


Click image to expand...nice reconstruction by Julius Csotonyi.

On Wed, Oct 28, 2015 at 8:22 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
> A new paper:
> Aaron J. van der Reest, Alexander P. Wolfe & Philip J. Currie (2016) [2015]
> A densely feathered ornithomimid (Dinosauria: Theropoda) from the
> Upper Cretaceous Dinosaur Park Formation, Alberta, Canada
> Cretaceous Research 58: 108–117
> doi:10.1016/j.cretres.2015.10.004
> http://www.sciencedirect.com/science/article/pii/S0195667115300847
> A recently discovered articulated partial skeleton of Ornithomimus
> from the Upper Cretaceous Dinosaur Park Formation of Alberta, Canada
> is remarkable in the extent and quality of preservation of
> integumentary structures including feathers. It is the first
> ornithomimid to preserve a tail bearing extensive plumaceous feathers
> that are slightly more elongate in comparison to those present on the
> remainder of the body. However, the underside of the tail and the hind
> limb distal to the middle of the femur appear devoid of plumage.
> Overall, the plumage pattern in Ornithomimus is similar to that of
> Struthio camelus (ostrich) and other large palaeognaths, indicating a
> probable function in thermoregulation. The specimen also preserves the
> body outline around the legs, including a skin contour anterior to the
> femur, analogous to skin webs in extant birds. Whereas the knee web of
> birds bridges the knee to the abdomen, in Ornithomimus it spans from
> the mid-femoral shaft to the abdomen, and is herein referred to as an
> anterior femoral web. This is the first report of such soft tissue
> structures in non-avian theropods. It may indicate that the resting
> position of the femur was positioned more anteroventrally in
> ornithomimids than in most theropods, and in that sense may have been
> transitional to the situation in modern birds.