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Re: A few more...
In a message dated 95-10-02 13:31:35 EDT, Thomas_R_HOLTZ@umail.umd.edu (th81)
>Expression in the egg of unguals are NONfunctional, whereas the juvenile
>hoatzins demonstrate a reversal to a condition in which the unguals are
>present and used after hatching. This is a reversal, and it did happen. It
>also suggests mechanisms whereby the metatarsals of therizinosauroids and
>sauropods might, in their own ways, revert to an ancestral (in the former
>case) or unique (in the latter) state.
Well, then, perhaps the arctometatarsalian condition reversed in
_Compsognathus_ or in other small theropods.