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re: pteros have lift-off
MH: <<In this case, my argument is that starting with the position that most
pterosaurs were quad launchers is probably the better option, at least at the
moment. We may then find some exceptions to the trend as time goes along (which
would be nifty in and of itself).>>
Mike, Let's go, waaay back, to the origin of pterosaurs. Mike, where do
pterosaurs come from? And which one is the most basal known pterosaur? What do
these taxa have to tell us about a quad launch vs. a biped launch? Short
explanation will suffice (aka: big arms, big hips, whathaveyou).
Also, which is the most important articulation creating the most forelimb
launch power? The humerus/antebrachium? humerus/shoulder?
antebrachium/metatacarpus? Or all three?
Finally, in present day leapers, from frogs to kangaroos, sort of 'Z' fold gets
created by the femur, tibia and tarsal/pedal elements. And lots of final push
comes from the large pedal digits. Is there a z-fold analogy in the forelimb of
pterosaurs. And is there lots of push coming from the manual digits? At
present, I don't see either.
BTW, I'm not arguing a particular point. I just want to understand in lieu of
measureable images and diagrams of a leaping pterosaur, which seem to be