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Re: the bipedal ptero-challenge

Scott observed:

>1) pterosaurs can't move bipedally like dinosaurs because they a) don't
have their center of gravity in the right place >for a horizontal posture,
b) fail to enlarge their illia anteroposteriorly like theropods do.<

>2) they don't show the adaptatins to upright bipedalism seen in hominids,
especially the double curve in the sacral >series.<

    That first point is an extremely cogent one.

    Thanks for pointing it out.  I had noticed that pterosaur manus (front
foot) imprints are consistently much more impressed into the substrate than
are imprints of the pes (back foot).

    Ray Stanford
    Mesozoic Track Project
    College Park, Maryland, USA