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Re: Dinosaur Genera List update #196
Nick Gardner wrote-
> But the pictures are so beautiful, they make me want to drool for hours.
Beautiful, yes. Informative, no. Yixian material often photographs in such
a way that it's difficult to determine morphological characters from photos
> >Even though it seems to be a dromaeosaur, this is only based on
> >the elongate distal caudal prezygopophyses and chevrons. The fused
> >plates are an avian character that could put
> >it at the base of the Avialae. If this were
> >true, it would not be good evidence of secondary flightlessness.
> Besides, isn't _C. pauli_ considered volant? Doesn't it have
> deinonychosaur-like pedal morphology though? I've not looked at it in
The second pedal ungual is enlarged, but this is also found in Rahonavis of
course. It is uncertain if the proximoventral heel on phalanx II-2 was
fully developed like deinonychosaurs or distinct from the proximal articular
surface like Rahonavis. And if it was a basal avialan, its ability to fly
wouldn't matter much in the context of neoflightlessness.