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Hello to all guys!!!, I would like to ask again for help in the ID of some teeth. I´ve been searching in a local university's museum for teeth of the original strata (Upper Paleocene), and I have found a very interesting set of boxes containing a bunch of different teeth, all labeled as "Scapanorhynchus sp.", maybe existing a missidentification. The question would be if any of you guys can ID the pieces and how to differentiate the Scapanorhynchus sp. from Striatolamia striata or Sylvestrilamia teretidens, the options I´m leaning for the ID of the teeth. I would also like to check if you guys @will stevenson , @MarcoSr or @bthemoose have any info about it. You guys are awesome!! The ruler is a 1mm step grid, and I'll try to order them from anterior to posterior (I am aware that each one can be of different taxa), all of them have a stronger or weaker folded surface in lingual side. Any help or info is welcome, thanks guys!!! and greetings from Chile. 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) Finally, this one has the weakest folding:

Here is one I spent some time looking at yesterday. I purchased this a year ago, sold as a Leptostyrax. It was found near Moscow, Russia and I believe the correct age is Cenomanian. I put this is the display and forgot about it. I have been trying to study up on Russian shark teeth because we have about 200 that will be here in June. I decided to take a second look at this one and compared it to the Texas Leptostyrax I have. Definitely not a match. Under the scope, the Russian tooth looks like a Goblin but not quite like the Scapanorhynchus teeth I have. It’s a little under .5” . It could be a different species of Scapanorhynchus that I’m not familiar with but I did some research on I wonder if perhaps this is Pseudoscapanorhynchus ? I am not sure about the ID to a genus level but I do think Mitsukurinidae is the right track.