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Re: Carniadactylus paper and pterosaur ontogeny
On Aug 1, 2009, at 9:38 AM, Mike Habib wrote:
This is just nonsense. Isometric growth has been demonstrated for
the forelimb-hindlimb ratio -- and that's it. Skulls most
obviously didn't grow isometrically in pterosaurs; neither do they
You're standing by an unproven paradigm. Show me one juvenile and
one associated adult to prove your statement.
None of the embryos discovered are geometrically similar to the
Not true. Trace and reconstruct the bones. Then get back to me. We'll
Furthermore, none of the animals you are suggesting as juveniles are
geometrically similar to the adults, either, and if those animals
are, in fact, some kind of tiny adult, then you don't have a sample
to demonstrate isometry in the first place.
A little confused, Mike. The embryos and hatchlings are the only ones
I'm suggesting are similar to the adults. Plus the little Pteranodon.
It's also worth noting that for pterosaurs to be flighted at small
size and retain flight ability through growth, they cannot grow
1. Only Unwin said they were flighted at hatching.
2.Your statement is not backed up by the literature. Please share.
Michael Habib, M.S.
Center for Functional Anatomy and Evolution
Johns Hopkins School of Medicine
1830 E. Monument Street
Baltimore, MD 21205