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Re: Kulindadromeus, basal ornithischian from Siberia with both feathers and scales

The fact that small ornithischians had feather-like ingementary
structures which was presumably used for insulation, goes a long way
toward explaining the presence of small ornithopods in southern polar
regions during the Cretaceous.  These include the abundant
"hypsilophodont"-grade ornithopods in southeastern Australia (Early
Cretaceous), the putative dryosaurid from New Zealand (Late
Cretaceous), and _Trinisaura_ from Antarctica itself (Late
Cretaceous).  All of these critters might have sported a thick
feathery coat, at least during the long dark winter.



On Fri, Jul 25, 2014 at 4:17 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
> Here's the much anticipated official paper about the "feathered"
> ornithischian Kulindadromeus from Siberia. The supplemental material
> is free. The nomenclatural issues will be a headache after the Russian
> paper a few weeks ago...
> Pascal Godefroit, Sofia M. Sinitsa, Danielle Dhouailly, Yuri L.
> Bolotsky, Alexander V. Sizov, Maria E. McNamara, Michael J. Benton &
> Paul Spagna (2014)
> A Jurassic ornithischian dinosaur from Siberia with both feathers and scales.
> Science 345( 6195): 451-455
> DOI: 10.1126/science.1253351
> http://www.sciencemag.org/content/345/6195/451
> Middle Jurassic to Early Cretaceous deposits from northeastern China
> have yielded varied theropod dinosaurs bearing feathers. Filamentous
> integumentary structures have also been described in ornithischian
> dinosaurs, but whether these filaments can be regarded as part of the
> evolutionary lineage toward feathers remains controversial. Here we
> describe a new basal neornithischian dinosaur from the Jurassic of
> Siberia with small scales around the distal hindlimb, larger
> imbricated scales around the tail, monofilaments around the head and
> the thorax, and more complex featherlike structures around the
> humerus, the femur, and the tibia. The discovery of these branched
> integumentary structures outside theropods suggests that featherlike
> structures coexisted with scales and were potentially widespread among
> the entire dinosaur clade; feathers may thus have been present in the
> earliest dinosaurs.
> News story:
> http://news.nationalgeographic.com/news/2014/07/140724-feathered-siberia-dinosaur-scales-science/