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Re: Concavenator corcovatus, a new humped carcharodontosaurid from Las Hoyas



Sad, it really just reads like the authors want these to be quill knobs more 
than anything else. Maybe the actual paper offers better insight.

Jason

--- On Wed, 9/8/10, Jocelyn Falconnet <j.falconnet@gmail.com> wrote:

> From: Jocelyn Falconnet <j.falconnet@gmail.com>
> Subject: Concavenator corcovatus, a new humped carcharodontosaurid from Las 
> Hoyas
> To: "Dinosaur Mailing List" <dinosaur@usc.edu>, "Ian Paulsen" 
> <birdbooker@zipcon.net>
> Date: Wednesday, September 8, 2010, 1:51 PM
> Neat !
> Thank you Ian !
> 
> :-D
> 
> Here is the appropriate reference and the abstract:
> 
> Ortega F., Escaso F. & Sanz J.L. 2010. A bizarre,
> humped
> Carcharodontosauria (Theropoda) from the Lower Cretaceous
> of Spain.
> Nature 467: 203-206.
> 
> Carcharodontosaurs were the largest predatory dinosaurs,
> and their
> early evolutionary history seems to be more intricate than
> was
> previously thought. Until recently, carcharodontosaurs were
> restricted
> to a group of large theropods inhabiting the Late
> Cretaceous Gondwanan
> land masses, but in the last few years Laurasian evidence
> has been
> causing a reevaluation of their initial diversification.
> Here we
> describe an almost complete and exquisitely preserved
> skeleton of a
> medium-sized (roughly six metres long) theropod from the
> Lower
> Cretaceous series (Barremian stage) Konservat-Lagerstätte
> of Las Hoyas
> in Cuenca, Spain. Cladistic analysis supports the idea that
> the new
> taxon *Concavenator corcovatus* is a primitive member of
> Carcharodontosauria, exhibiting two unusual features:
> elongation of
> the neurapophyses of two presacral vertebrae forming a
> pointed,
> hump-like structure and a series of small bumps on the
> ulna. We think
> that these bumps are homologous to quill knobs present on
> some modern
> birds; the knobs are related to the insertion area of
> follicular
> ligaments that anchor the roots of the flight feathers
> (remiges) to
> the arm. We propose that *Concavenator*  has
> integumentary follicular
> structures inserted on the
as in modern birds.
> Because scales do
> not have follicles, we consider the structures anchored to
> the
> *Concavenator* arms to be non-scale skin appendages
> homologous to the
> feathers of modern birds. If this is true, then the
> phylogenetic
> bracket for the presence of non-scale skin structures
> homologous to
> feathers in theropod dinosaurs would be extended to the
> Neotetanurae,
> enlarging the scope for explaining the origin of feathers
> in
> theropods.
> 
> --
> Jocelyn Falconnet
> 
> 2010/9/8 Ian Paulsen <birdbooker@zipcon.net>:
> > HI ALL:
> >  FYI:
> >
> > http://news.yahoo.com/s/ap/20100908/ap_on_sc/us_sci_humpbacked_dinosaur;_ylt=AkTES2LpLeEnKiAIfkNSAdoPLBIF;_ylu=X3oDMTJybnNpMWVyBGFzc2V0A2FwLzIwMTAwOTA4L3VzX3NjaV9odW1wYmFja2VkX2Rpbm9zYXVyBGNwb3MDMQRwb3MDMQRzZWMDeW5fdG9wX3N0b3J5BHNsawN3b3VsZHlvdWxpa2U-
> >
> > sincerely
> > --
> >
> > Ian Paulsen
> > Bainbridge Island, WA, USA
> > " Which just goes to show that a
> >  passion for books is extremely unhealthy."
> >  from Cornelia Funke's "Inkheart".
>