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Re: four-winged dino -- ptero homology?

    David Peters said:

>Pterosaurs...apparently ran bipedally on
>hind limbs encumbered(?) by flight membranes..." <

    Without a stitch of trackway evidence to back up such a statement,
shouldn't use of the word "apparently" (as applied to bipedal locomotion) be
taken with a very substantial 'grain of salt'?

    Please do us a favor, Dave.  Provide evidence of one, just ONE, bipedal
pterosaur trackway. You could really make your mark pterosaur research

    In saying bipedal, I mean forward progression on the back feet, not on
the front feet. :o)

    Ray Stanford
    Mesozoic Track Project
    College Park, Maryland, USA

"You know my method.  It is founded upon the observance of trifles." --
Sherlock Holmes in The Boscombe Valley Mystery

----- Original Message -----
From: "David Peters" <davidrpeters@earthlink.net>
To: <dinosaur@usc.edu>
Sent: Friday, January 24, 2003 7:28 AM
Subject: four-winged dino -- ptero homology?

Do you think the homologous case of Sharovipteryx sheds any light on the
current four-winged controversy?

Pterosaurs, and especially Sharovipteryx, apparently ran bipedally on
hind limbs encumbered(?) by flight membranes and glided with them as
well. In the latter case, the hind wings are much larger than the fore
wings, but it doesn't take too much imagination to consider that at one
point in the ancestry of Sharovipteryx the fore and hind wing membranes
were similarly sized.