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Re: Serration variation

>>>>Also, have primitive and derived serration characters
been described in any kind of detail?  Did serrations evolve basally in
therepods or did the earliest therepods lack serrations?  Could serrations
be basal to Dinosauria<<

Although I think that to some extent, serrations can be used, in a phylogenic
analysis, I would be leery of any grand order of dinosaurs based on tooth
serrations.  I'm sure that such a simple feature of teeth would be easily
changeable and no doubt, some clades evolved, discarded, and then re-evolved
serrations.  Tooth shape indicates behavior more than phylogeny.