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

Re: Longipteryx chaoyangensis (Aves, Enantiornithes?)



> > I think some early birds lack quill nodes on the ulna - like
> Archaeopteryx. Rahonavis though has them. I think this character
> (presence/absence of quill nodes) is variable in modern birds.<
>
> Not exactly sure of your point, but all birds that fly have flight
feathers
> anchored to bone--that's how the lifting and thrusting forces are
> transferred to the frame of the animal.  That adaptation (the ability to
> transfer aerodynamic forces to the skeleton) >had< to appear prior to
> flight, not after it. I'm still waiting for the first report of quill
nodes
> on some small flightless feathered theropod!

May perhaps come anytime. *Archaeo-* and *Caudipteryx* are said not to have
quill knobs, but those of *Rahonavis* are so tiny that probably nobody has
yet really looked for them ones in the first two.