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RE: Did dinosaur wings evolve for breeding display?/Longisquama
Scott H. wrote:
>>I'm not sure Longisquama has any bearing at all; the only possible
use of it would be to explore convergent evolution, but since we
don't know for sure that the structures actually go to Longisquama,
and if they do we aren't sure what they are used for, they really
can't tell us anything about the origin of theropod wings.<<
Look at the predecessor taxa of Longisquama. Cosesaurus has a set of
median dorsal segmented frills. They just grow longer in Longisquama.
So, yes. they do belong to the skeleton.
Tim W. wrote:
>>Voigt et al. (2008) explicitly reject Sharov's interpretation, and
(1) there is no evidence for more than one row of appendages in the
_Longisquama_ type specimen; and (2) even assuming that the
paired, they would have performed poorly as airfoil-generating
et al. also reject the hypothesis that the _Longisquama_ appendages were
homologous to feathers.<<
Jaime and Tim and Voigt et al. are indeed correct, as Reisz and Sues
published nearly a decade ago. So, what is new in the Voigt paper?
Why was it written?
Peters 2002 discussed the evolution of wings in fenestrasaurs to
pterosaurs for possible breeding display and more. A lot has been
discovered since then, all of which enhances and supports this scenario.
Reisz, R. and Sues, H-D. (2001) Longisquama does not have
feathers. Journal of Vertebrate Paleontology 21(Supplement
to No. 3), 92A.
Reisz. R. and H.-D. Sues. 2000. Palaeontology: The “feathers” of
Longisquama. Nature 408:428.
Peters, D. 2002b. A New Model for the Evolution of the Pterosaur Wing
– with a twist. - Historical Biology 15: 277–301.