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Re: alvarezsaur fingers

2011/5/14 Tim Williams <tijawi@gmail.com>:

> Spinosaurids, compsognathids, _Nqwebasaurus_ and alvarezsaurids all
> show an enlarged pollex.  That of _Nqwebasaurus_ is inferred to have
> had some opposability to the other two digits when flexed.
As far as I know, the pollex is also the most robust manual digit in
all archosaurs (well, not in at least some birds).