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hastalis lower teeth have more angular roots than planus lower teeth which are more rounded. I will get some scans when I get a chance. As far as hastalis goes, the teeth, particularly the roots are very comparable to Carcharodon carcharias. So you can place them in jaw position by matching them up with a GW jaw. Separating lateral and posterior teeth from I. oxyrinchus can be problematic, but in the end, how much does it matter. As far as STH goes, almost all the oxyrinchus I have seen from there have been pretty small, so I would grade them by size.