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Re: Phylogeny of Maniraptora
James R. Cunningham <email@example.com> wrote:
You're interpreting me correctly. There are times when being coplanar
would be an advantage. There are other times when being actively
non-coplanar might offer even more advantage. I gather from your
phrasing below that you accept hindlimb involvement in all wings associated
with patagiums. If so, is that a functional requirement?
I was referring to the membrane (patagium) stretched between the forelimbs
and hindlimbs of gliding mammals - colugos, "flying" squirrels, "flying"
possums, and the like. The patagium links the forelimbs and hindlimbs in
functional allegiance during gliding. _M. gui_ probably displayed a similar
Graydon <firstname.lastname@example.org> wrote:
You get something like flapping from the predatory stroke if you push a
basal maniraptoran out of a tree; it may not do any good, but that's what
its arms _do_ when trying to move rapidly, they're not the peculiar
wide-range-of-motion things people have got.
Sorry, I don't follow. Why would the maniraptoran flail its arms around in
a predatory-stroke-like motion when falling from a tree?
Come to think of it, who pushed it out of the tree in the first place? What
I'm getting at is, if a maniraptoran can get up a tree, it must have the
ability to get down. Therefore, it may have evolved an apparatus that
facilitated this route.
If it's a maniraptoran, it can flap. (maybe not *well*, but it can flap.)
But, *why* would it flap? You've explained the *how*, but not the *why* of
the predatory stroke --> flight stroke pathway.
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