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Re: Re: A few more...
>>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.
Sure. Phil Currie thinks it reversed in the origin of birds (which he
considers derived bullatosaurs, by the way). I don't find such a position
in the most parsimonious distribution of derived character states in my
current analysis, but it is certainly a reasonable hypothesis.
Thomas R. Holtz, Jr.
Dept. of Geology
University of Maryland
College Park, MD 20742