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Re: Non-avian Uncinates
> Liaoxiornis appears to be an enantiornithine without ossified uncinates,
> several features suggest it is juvenile, which may explain their absence.
> However, uncinates are only known from one Velociraptor specimen, and
> with fairly well preserved rib cages (IGM 100/982) do not show definite
> uncinates. Thus, it is possible Iberomesornis did have them.
There seems to be a large amount of random in whether uncinates ossify or
not. After all, Willo the *Thescelosaurus* has huge uncinate _plates_,
whereas by far not all living birds have uncinates (see the second post by
HP GSP in http://www.dinosauria.com/jdp/misc/lungs.html, which is a copied
thread from this list).