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Re: bauplan convergence
At 06:53 PM 6/14/00 -0400, Dinogeorge@aol.com wrote:
In a message dated 6/14/00 5:50:00 PM EST, NJPharris@aol.com writes:
<< Perhaps so, but one of the leading theories of the origins of insect
(and, I presume, the one to which Tim was alluding) is that insect wings
developed first as propulsive organs for moving the animal across the
of the water and that insect flight--*powered* flight--developed from the
pond up. >>
I find this argument very difficult to swallow, but then I don't know much
about insects. Are there any extant aquatic insects that have such propulsive
Yes, that is the origin of the theory. Some extant insect nymphs, I
believe in dragonflies or damselflies, use this method to get to land prior
to molting into a winged adult.
The paper that proposed the idea was very well presented, and I found the
concept quite compelling, actually.
[Indeed, the only alternative to a "trees-down" origin of flight in *birds*
I find even remotely plausible is the one that suggests protowings
developed for swimming, as in penguins].
May the peace of God be with you. firstname.lastname@example.org