FB003 Posted June 17, 2022 Share Posted June 17, 2022 Hi all, Trying to place an ID on it. Seller had it listed as "dromaeosaur". I wanted the near perfect troodon tooth that came with it so didn't matter what this was. Looks like a tiny little acheroraptor to me but I could be wrong. Still learning. Tough to get closer on the serrations even with a macro lens but if needed just let me know. Thoughts? Thanks, Frank From Hell Creek - Carter County, MT Measurements below in mm. *Frank* Link to comment Share on other sites More sharing options...
Troodon Posted June 17, 2022 Share Posted June 17, 2022 Frank, can you take a straight in photo of your first image. Need to get a better view of the crown and see what ridges are present. 1 Link to comment Share on other sites More sharing options...
FB003 Posted June 17, 2022 Author Share Posted June 17, 2022 50 minutes ago, Troodon said: Frank, can you take a straight in photo of your first image. Need to get a better view of the crown and see what ridges are present. You betcha. Took a few different straight in shots. Honestly couldn't tell if they were ridges or cracks from aging. *Frank* Link to comment Share on other sites More sharing options...
Troodon Posted June 17, 2022 Share Posted June 17, 2022 Thank you Like you've seen on some other of my posts we do not have any complete dentitions of the dromaeosaurids in the HC/L formations so all I have to go on is what has been published. The lack of vertical ridges is one of the key characteristics describing an Acheroraptor and coupled with a low density difference between carinae points to it not being one.. Its not Dakotaraptor the morphology is different. There is most likely a third Dromaeosaurid in these deposits but we have no clear definition of what the dentition looks like or even if it exist. Might be that but for the time being I'm leaning to this being a very posterior Nanotyrannus tooth because of the denticle shape and Density. 1 1 Link to comment Share on other sites More sharing options...
FB003 Posted June 17, 2022 Author Share Posted June 17, 2022 4 minutes ago, Troodon said: Thank you Like you've seen on some other of my posts we do not have any complete dentitions of the dromaeosaurids in the HC/L formations so all I have to go on is what has been published. The lack of vertical ridges is one of the key characteristics describing an Acheroraptor and coupled with a low density difference between carinae points to it not being one.. Its not Dakotaraptor the morphology is different. There is most likely a third Dromaeosaurid in these deposits but we have no clear definition of what the dentition looks like or even if it exist. Might be that but for the time being I'm leaning to this being a very posterior Nanotyrannus tooth because of the denticle shape and Density. Thanks Frank. I actually started having that inkling myself as I was going through your post on dakotaraptor vs nano teeth and trying to research it on my own. I had ruled out dakotaraptor but started seeing some similarities to nano. I'll label it as that with a note to revisit in 5-10 years lol. Ordered a USB microscope to make it easier to get closer and take pictures too. This one was not fun with the macro lens on phone. *Frank* Link to comment Share on other sites More sharing options...
Troodon Posted June 17, 2022 Share Posted June 17, 2022 Hopefully someday we will understand what these Dromaeosaurid dentition's look like and get one published on Nanotyrannus. The HC is not quick to give up its secrets. 1 Link to comment Share on other sites More sharing options...
FB003 Posted June 17, 2022 Author Share Posted June 17, 2022 I'm sure there is plenty more to discover thats for sure. *Frank* Link to comment Share on other sites More sharing options...
Dino Dad 81 Posted July 1, 2022 Share Posted July 1, 2022 Sorry to piggyback here, but I have what looks like the adjacent tooth from the same individual Something my assessment showed which I think is present on @FB003 tooth also, but was missed, is a DSDI wayyyy over 1. Hell Creek, Garfield Co, Montana CH: 6.5mm CL: 4.0mm Mesial serration density: about 14/mm?? Distal serration density: 6-7 per mm Link to comment Share on other sites More sharing options...
Dino Dad 81 Posted July 1, 2022 Share Posted July 1, 2022 @Troodon, I should have tagged you on this Link to comment Share on other sites More sharing options...
Troodon Posted July 1, 2022 Share Posted July 1, 2022 I'm going to go on strike trying to ID teeth smaller that 10mm . Its extremely difficult especially when we have no dentition's to compare against no information on micro teeth. This tooth might be a Richardoestesia gilmorei I spoke to Pete Larsen saw him in June and he was pretty sure we have 3 Dromaeosaurid in the HC. Until something is found in the jaw pretty hard to say what they look like. 1 Link to comment Share on other sites More sharing options...
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