[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Non-avian Uncinates



> Liaoxiornis appears to be an enantiornithine without ossified uncinates,
but
> several features suggest it is juvenile, which may explain their absence.
> [...]
> However, uncinates are only known from one Velociraptor specimen, and
others
> 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).