[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: More on the Jeholopterus pycnofibre study
----- Original Message -----
From: "David Peters" <email@example.com>
To: "dinosaur mailing list" <firstname.lastname@example.org>
Sent: Friday, August 28, 2009 5:53 AM
Subject: re: More on the Jeholopterus pycnofibre study
In bats the wing shape is dynamic and ever-changing, tightening and
stretching between the various elements (several fingers and the hind
limbs). In birds the wing shape is more constrained by the orientation of
the stiff feathers of unyielding length and the bending of the elbow and
wrist. The hindlimbs are not involved. Which of these two are pterosaurs
more similar to?
Certainly the forelimb membrane has the flexibility to extend as a wing
and contract to almost nothingness during folding, as in bats, but
pterosaurs have only one wing finger and the akinofibres restrict the
shape of the wing.
Actually, within the limits of their range of motion, they modulate the
shape of the wing, rather than restricting it.