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RE: Pterosaur origins

>>Yet Tyrannosauroidea has a stem-based definition that would include
>>in Senter's topology, so you can't have Coeluroidea and
>Tyrannosauroidea as 
>>sister taxa.
>>It's the same situation as Sereno's Spinosauroidea and
>Oviraptoroidea vs. 
>>Megalosauroidea and Caenagnathoidea.

Which, of course, was why I was careful to phrase my reply in
specific reference to the ICZN.


        Christopher Taylor