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Re: Concavenator corcovatus, a new humped carcharodontosaurid from Las Hoyas
"Jura" <firstname.lastname@example.org> wrote:
> 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.
Hmmm... I really don't see why the idea of quill knobs in a carcharodontosaur
is so controversial. We already know that _Velociraptor_ had them.
_Velociraptor_ couldn't fly, and there's no compelling evidence that it evolved
from flighted ancestors. So _Velociraptor_ tells us that the presence of quill
knobs cannot be assumed to indicate flight ability. _Concavenator_ tells us
that quill knobs can exist in non-maniraptorans.
One possibility is that the quill knobs anchored spike-like integumentary
structures along the ulna in _Concavenator_ and _Velociraptor_. These spikes
may have therefore been quite widespread among theropods, but did not always
leave an osteological 'footprint' (= quill knobs).
This isn't my idea, but comes from Darren Naish over 10 years ago:
"Another thought it that some non-avian theropods could have modified
their primaries into stiff, spike-like structures that could not have
been fouled or snapped in predatory strikes."