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RE: Pterosaur Species List updates

Mike Hanson wrote-

> Avgodectes and its synonyms are now listed as synonymous with Yixianopterus, 
> though this requires some nomenclatural gymnastics, Avgodectes is now a nomen 
> dubium.

How does this work?  By definition, a nomen dubium cannot be a synonym, because 
in order to be a nomen dubium, it would have to be indistinguishable from at 
least two species, so couldn't be a definite synonym of either.
Mickey Mortimer