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Re: Tomial crest of dinosaurs and pterosaurs

I'm trying to figure out the function of the tomial
crest of some dinosaurs and (may be) pterosaurs (e.g.
Gobipteryx,Euoplocephalus,flamingos).

As its name says: cutting. (Ana-tomy = cutting apart.) It supports the cutting edge of the beak. IMHO it's a completely unnecessary term. :-)

Basically I'm trying to know whether or not they are
homologous

They can't be homologous -- a tomial crest can't exist in the same place in a jaw as teeth.