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Re: Did dinosaur wings evolve for breeding display?/Longisquama
What's not clear?
IMHO, if the association of 'fronds' to skeleton were anything but
genuine, the 'roots' of the fronds would appear to be detached or run
through or go beyond the corpus. In this case, the association
between the bottom-most portion of the dorsal frill and top of the
vertebral column is spot on.
Coincidence??? I think not.
Unique? Probably not. Think Iguana. Sphenodon. Sometimes they are
shed, along with the rest of the skin.
Reisz and Sues were speculative? I think not. It was a good paper.
Voight et al. amplified those findings. That's always good.
The wings of Longisquama, are the forelimbs, of course. As I wrote in
2002, Longisquama has the same sort of pectoral complex as we see in
pterosaurs. Fused interclavicle, overlapping clavicles rimming the
sternum. Precursor condition in Cosesaurus. These things were
flapping from the get-go all to get food, create a little excitement
in the bedroom, or to startle strangers.
I hear Longisquama is being redescribed by a number of workers.
Something to look forward to.
On Apr 17, 2009, at 4:34 PM, Jaime Headden wrote:
Dave Peters wrote:
It is not clear that this is authentic association, however,
since while apparently some frilliness is in ONE taxon that ONE
individual associated with *Longisquama*, the material in *L.* is
so far unique to itself in nature. That the integumentary
structures (if they are indeed integumentary in origin) have a
super and substructure that is unique, positing similarities due to
an inferred relationship is unsound. It would help if we found an
unfaked skeleton with associated structures and in a better state
of preservation, and/or some method to determine the method of
implantation of these structures in the body.
New assessment of the structures, and a unique, fresher
perspective? Or the fact that Reisz and Sues were speculative, but
Voight et al. were more concrete and used new machines to assist
These "fronds", if they are integumentary in origin, have nothing
to do with wings in *Longisquama*. As such, they are (or should)
not have any bearing on the origin of pterosaur wing structure.
More consistently, you see lizards using their spines and skulls
for breeding displays, and ribs for aerial maneuverability, and
ne'er do the twain meet it seems.
Jaime A. Headden
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