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Re: Heterodontosaurid with protofeathers

On Thu, Mar 19, 2009 at 11:17 PM, evelyn sobielski <koreke77@yahoo.de> wrote:
>> If the "dinofuzz" of _Tianyulong_ and the "pterofuzz" of
>> pterosaurs like _Sordes_ is NOT homologous to bird feathers,
>> then the Avifilopluma would be limited to maniraptoriform
>> theropods.

Or possibly a larger clade of coelurosaurs if, e.g., _Sinosauropteryx
and _Dilong_ are not maniraptoriforms.

>>Â But, if either integument is homologous to
>> bird feathers, then Avifilopluma could be expanded to
>> include ornthischians (Avifilopluma=Dinosauria) and/or
>> pterosaurs (Avifilopluma=Ornithodira).
> Assuming either would happen - which name would apply?

All of them. Tim says "=" but should say "â" (or "=~" if that
character doesn't make it through). Since _Avifilopluma_ is
apomorphy-defined, it's extremely unlikely that it would turn out to
be the same as a node-defined clade like _Dinosauria_ or
_Ornithodira_, although it might have similar (or even identical)
known content. If feathers and ornithischian quills are synapomorphic,
then _Avifilopluma_ would include _Dinosauria_, and almost certainly
not equal it. If, in addition, "dino-quills" are synapomorphic with
"ptero-fur", then _Avifilopluma_ would include all of _Ornithodira_
(assuming that pterosaurs are stem-avians). In the unlikely event that
the apomorphy goes beyond the avian total group (i.e., that
crocodylians are secondarily "unquilled" -- apologies to
_Unquillosaurus_), then _Avifilopluma_ becomes a synonym of _Panaves_
or _Pan-Aves_ or whatever the avian total group is named.

Of course, no code governs the definition of any of these names yet,
so it's all fair game.
T. Michael Keesey
Technical Consultant and Developer, Internet Technologies
Glendale, California