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RE: Carniadactylus paper and pterosaur ontogeny

Dave Peters wrote:

  Dave, your argument
here amounts to hand-waving and delcarations without substance: If you
say that all pterosaurs remain isometirc copies of their juveniles,
then it is easy to argue that any juveniles that appear are in fact NOT
juveniles of anything, and that they are just adults,l of unique
species or entirely different genera; on the other hand, you also argue
that that pterosaurs cannot possess allometric change during ontogeny
because all of these pterosaur juveniles are really adults. You fail to
show, in the first place, that these juveniles are themselves NOT
juveniles of the pterosaurs to which they are ascribed; nor have you
demonstrated how this should be true. You have instead opted for the "I
have invisible juveniles" and that pterosaurs MUST have isometric
values across the skeleton, because your invisible babies support this,
without anyone being able to verify your work despite looking at and
using your own methods. I wonder, why are you still arguiong this point
instead of working on cleaning your technique to support/disprove your
theory first?

  Why is this not
consistent? *Ctenochasma* juveniles show fewer teeth, in which case
they are following typical vertebrate patterns of dental ontogeny
(number and size increase with growth). It should then be no surprise
at all that Jouve and Bennet have this impression, since it is
consistent with virtually all other vertebrates.


Jaime A. Headden

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