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Re: Scansoriopteryx, a non-dinosaurian bird (?)



Ben Creisler
bcreisler@gmail.com

To add to the merriment, a news story:

http://phys.org/news/2014-07-declassify-dinosaurs-great-great-grandparents-birds.html





On Wed, Jul 9, 2014 at 11:28 AM, dale mcinnes <wdm1949@hotmail.com> wrote:
> That's cruel Tim.
>
> Sometimes the sky in some peoples' world is just a little different color.
>
> Sometimes a lot.
>
>
>> Date: Wed, 9 Jul 2014 10:22:34 +1000
>> From: tijawi@gmail.com
>> To: dinosaur@usc.edu
>> Subject: Re: Scansoriopteryx, a non-dinosaurian bird (?)
>>
>> Good for a laugh.
>>
>> On Wed, Jul 9, 2014 at 12:34 AM, Ben Creisler <bcreisler@gmail.com> wrote:
>>> Ben Creisler
>>> bcreisler@gmail.com
>>>
>>> A new online paper:
>>>
>>> Stephen A. Czerkas & Alan Feduccia (2014)
>>> Jurassic archosaur is a non-dinosaurian bird.
>>> Journal of Ornithology (advance online publication)
>>> DOI: 10.1007/s10336-014-1098-9
>>> http://link.springer.com/article/10.1007/s10336-014-1098-9
>>>
>>> Re-examination utilizing Keyence 3D digital microscopy and low angled
>>> illumination of the fossil Scansoriopteryx, a problematic sparrow-size
>>> pre-Archaeopteryx specimen from the Jurassic Daohugou Biotas, provides
>>> new evidence which challenges the widely accepted hypothesis that
>>> birds are derived from dinosaurs in which avian flight originated from
>>> cursorial forms. Contrary to previous interpretations in which
>>> Scansoriopteryx was considered to be a coelurosaurian theropod
>>> dinosaur, the absence of fundamental dinosaurian characteristics
>>> demonstrates that it was not derived from a dinosaurian ancestry and
>>> should not be considered as a theropod dinosaur. Furthermore, the
>>> combination in which highly plesiomorphic non-dinosaurian traits are
>>> retained along with highly derived features, yet only the beginnings
>>> of salient birdlike characteristics, indicates that the basal origins
>>> of Aves stemmed from outside the Dinosauria and further back to basal
>>> archosaurs. Impressions of primitive elongate feathers on the
>>> forelimbs and hindlimbs suggest that Scansoriopteryx represents a
>>> basal form of “tetrapteryx” in which incipient aerodynamics involving
>>> parachuting or gliding was possible. Along with unique adaptations for
>>> an arboreal lifestyle, Scansoriopteryx fulfills predictions from the
>>> early twentieth century that the ancestors of birds did not evolve
>>> from dinosaurs, and instead were derived from earlier arboreal
>>> archosaurs which originated flight according to the traditional
>>> trees-down scenario.