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Cretaceous Mammal Tooth Fossil ID Please


petoskeypicker

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Hi, I recently got this cretaceous mammal tooth from the Hell Creek formation, and I was wondering if you may help me find the scientific name of the species that it belonged to. I've done some research and learned that it was the premolar of a Multituberculate mammal. This order of mammals was diverse and there were many species. I think it might be one of the members of the Genus, Mesodma, Yet I could be wrong. I tried to narrow it down to the exact species, yet there are few examples to help me pinpoint to a certain Id. This tiny tooth is from Garfield County, Montana. it is from the late cretaceous period (~67 - 66 Ma).  It measures approximately at 3/16" long by 3/16" wide (5 mm x 5 mm). It is thin and blade-like towards the top of the crown. The enamel has a grooved texture on the surface. The overall shape of crown resembles a saw blade. Hopefully I would be able to id. this specimen and to learn more about it. Feel free to ask me for better images.      

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Not always a slam dunk to ID this morphology of tooth.  I've provided some illustrations to let you compare against to be sure.

The profile at the bottom right compares several.  All about the shape.  Mesodma a good candidate.

 

Screenshot_20220114-043939_Drive.thumb.jpg.98f0a71a92b8075fd8ab33229bbbb420.jpg

A few more candidates

 

Screenshot_20220114-042659_Drive.thumb.jpg.af3db079eeb3a0700340426c38b209ad.jpg

Cimolodon, dont believe its this one.

Screenshot_20220114-042639_Drive.jpg.ee4798dd1adf8fa5801ffcf55d8d78f1.jpg

Another view of Parikimys

Screenshot_20220114-042614_Drive.jpg.8670fab2cf55cb69612e111e84acebbf.jpg

Paracimexomys

Screenshot_20220114-034426_Drive.thumb.jpg.6bce30abc070ee80621f308cb9e474c7.jpg

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Thanks for posting this paper, troodon.  I was not familiar with it.  This lower 4th premolar may be too big for Mesodma, but then, I have not read this paper yet.  In any case, petoskeypicker... nice little fossil.  I personally love these things...  

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That's a very nice tooth  and a very interesting specimen 

And thanks Troodon for posting the pdf just had a very enjoyable read of it 

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"A man who stares at a rock must have a lot on his mind... or nothing at all'

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Thank you Troodon for uploading the paper! This looks very informative and I will continue to look into it.

Edited by petoskeypicker
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39 minutes ago, ckmerlin said:

That's a very nice tooth  and a very interesting specimen 

And thanks Troodon for posting the pdf just had a very enjoyable read of it 

Thank you!

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