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Re: Nomina Dubia Part II: Rapator

I know I'm just jumping in here without much prior involvement in this debate, but...

Tim Williams wrote:

If this character (forked vs non-forked ischium) is not taxonomically significant 
AND it's the ONLY character used to distinguish _Archaeopteryx_ from 
_Shenzhouraptor_.... then yes, we would synonymize the two.<
What is your test for determining if a character is taxonomically significant? 
Wouldn't its significance only be determined after putting the character into a 
cladistic analysis? How do you make the determination yourself?