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re: Anurognathus dorsal frill, part II

Jaime wrote:

Food for thought. Sailfish
sails are bouyed by water, and perform a roll-preventing stabilizing
copntrol, which most flying animals do not need to contend with, dealing

with wings as they do, which do the same thing. Such a structure in a
flying vertebrate is simply not likely, though I do not say they could
exist. But the absence of a selective pressure for them, when there are
wings, would seem to imply such a thing is less likely to be true than
membrane structures in the wing only.


Here are a few more structures not likely in a flying vertebrate:

Skull crest comprising 5/6 of the skull area.
Wing framed by one extremely long (= more than a dozen feet) finger.
Skull more than 7 feet long (unknown at present, but reconstructable
from various elements).

all pterosaurian

Now let's talk about flamingoes, hummingbirds, peacocks and any other
extreme bird. Take a look at a birds of paradise and you'll see some
unlikely flyers. You're forgetting that sex and status sell-- and never
more so than in prolacertiformes -- including pterosaurs. They rival Dr.
Seuss's creations.

The dorsal frills are real. They're everywhere. You're just going to
have to get used to them.

Regarding the aerodynamic use of the structure, perhaps it was a
hinderance, but so were antler racks for Irish elk. The important thing
is these structures look good to pterosaurs and Irish elk respectively.

I know paradigms are hard to break down. Exercise, beer, and more
exercise might help.

David Peters
St. Louis