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Re: Pterosaur wing membranes
On May 21, 2006, at 8:36 AM, Jaime A. Headden wrote:
David Peters (email@example.com) wrote:
<If the membrane in question has ordered (parallel) actinofibrils,
then it may
be ripped off of the wing finger. If not ordered, as in the example
then the membrane may be considered uropatagial. Somebody get a
Parallel aktinofibrils do not neccessarily apply to "torn"
material, only to
relaxed, nonstretched skin between then, as when the wing are
folded, which is
the case in *Sordes* as well, so arguing for torn wing material as
Dave did in
1996 in reply to Unwin and Bakhurina, does not neccessarily follow.
Torn or untorn has nothing to do with parallel aktinofibrils.
Parallel fibers exist only on the wing and the outer wing at that --
except, of course, in the pre-pterosaur hindwing-glider
Sharovipteryx. But no one is arguing that here. The uropatagium in
pteros has unorganized fibers, as demonstrated by Unwin and
Bakhurina. No Pterodactylus has organized fibers in the uropatagium.
The presence or absend of parallel fibers will tell you whether this
is outer wing material or not.
uropatagium, if it existed, would also show a radial arrangement of
embedded fibres, if present, and parallel when relaxed.
Show me one example among pteros. Otherwise you are clearly mistaken.
In addition, it is also likely that leg-based "fillets" are
the leg-based membranes in *Sordes*, just as much as a ankle-to-arm
Show me one example of leg-based membranes on Sordes or anywhere,
other than the misguided cartoon of Unwin and Bakhurina and earlier
Sharov. Both were shown to be examples of geologic breaks in the
matrix with continuation beyond the wing finger and legs. Can't blame
the scientists involved. They were trying to make something out of
nothing in order to match an existing, but nevertheless mythological,
Jaime A. Headden
"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)
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