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Re: Water-bourne pterosaur launch and albatross take-offs
One side says fingers 1-3 faced palms anterior in flight and 4
hyperextended to fold (Bennett 2008). That means the former
connection between the lateral surface of metacarpal III and the
medial surface of IV have broken because the now ventral surface
of III is close to the now ventral surface of IV
No, it just means that IV is now humongously bigger than III.
Jim, you need to understand this. What I said is a consequence of
Bennett's model. It is illustrated as such by Bennett. I-IV are no
longer aligned and on the same plane. Their axes of distal
articulation are parallel now, not colinear as in other tetrapods.
Revisit the specimen or take another look at Quetz. There has been a
dislocation between III and IV. I-III should have been on top of IV if
simple supination had taken place, but they are not.
Of course any such problems disappear in the other model.
with regard to the Hatz in the tree, that's a Lanzendorf purchased
illustration found near the back of his book, now in the catacombs of
the Children's Museum of Indianapolis. Not saying I agree with it