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RE: Revising Hou et al, 96 (long)
Mickey Mortimer wrote:
> 1. feathers
> I leave this unknown in dromaeosaurids, though taxa some consider
> members of this family (Sinornithosaurus, Microraptor) have them, as
> does the new possible Yixian dromaeosaurid.
Mickey is a nice guy, but here he's being overly charitable. :-) The
new possible Yixian dromaeosaurid (BPM 1 3-13) shows structures along
its limbs and tail which could only be regarded as true feathers: these
structures have a rachis and barbs, conforming to the pinnate morphology
of modern feathers (as known for _Caudipteryx_, _Protarchaeopteryx_ and
> *. hypopubic cup
> This was not included because it is merely the ABSRDers excuse for
> Archaeopteryx's pubic foot. Archaeopteryx does not have a hypopubic
> cup, though Velociraptor ironically has a similar structure.
> Chaoyangia + Ornithurae-
> *. small pedal claws
> This character is rejected because it is not quantified and highly
> correlated with non-perching habits.
I'm a little unclear on this point. How so?
> "Cathayornis" (=Sinornis)
It does? I know this has been mooted...
> Deleting the poorly known Yandangornis
_Yandangornis_ is actually known from a nearly complete skeleton (ZMNH
M1326), though the forelimbs (wings?) are mostly missing. However,
_Yandangornis_ is preserved in two dimensions, which unfortunately
obscures certain anatomical details (as in specimens of
Nicholas Gardner wrote:
> It does seem strange that when you correct the characters the
> phylogeny no longer supports the Sauriurae-Ornithurae dichotomy. :-)
The entire Sauriurae-Ornithurae dichotomy is an example of not letting
the facts get in the way of a good story. I'm sure Mickey would agree.
Nice work, Mickey.
Timothy J. Williams
Iowa State University
Ames IA 50014
Phone: 515 294 9233
Fax: 515 294 3163