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Re: Tawa hallae: everything you know about basal saurischians is wrong...

 Ah, an analogous function for nonhomologous structure deriving from
 an homologous system (of bones).

I'm really surprised that the term _homoiologous_ still hasn't been mentioned. It means "analogous on a homologous base". Granted, outside of university courses and textbooks nobody seems to ever use it, but the wings of birds and bats are the textbook example for homoiology: they're homologous as forelimbs, but analogous as wings.

From Greek homoios/-a/-on = similar.