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Re: Pleurocoelus question

> Well, yes and no.  I disagree that teeth differences tell us nothng about
taxonomy.  Certainly the teeth of humans and chimps are different!  This can
tell us about taxonomy.

You're talking about mammals here. Isolated mammal teeth are usually
diagnostic down to the species. Most Mesozoic mammalian tooth taxa ("the
tooth, the whole tooth and nothing but the tooth") are indeed perfectly
valid. But this hardly works for anything else. Remember *Asiamericana* (not
a spinosaur, but a fish), *Siamosaurus* (a spinosaur? a plesiosaur? or even
a crocodile?), *Diclonius* and *Thespesius* (_any_ hadrosaur)...