PointyKnight Posted January 11, 2020 Share Posted January 11, 2020 (edited) Hey everyone, I came across these teeth online; They're being sold as an Acheroraptor teeth, but seemed odd to me and reminded me of some recurved Pectinodon teeth I had seen elsewhere (given their small size, too). [Tooth 1] The tooth was found in Hell Creek deposits in Carter County, Montana. I edited the seller's images together to make some features more visible. Its total height is 5mm; the serration density I measured is around 6/mm; Scale bar is 4mm. [Tooth 2] The tooth was found in Hell Creek deposits in Powder River County, Montana. Its total height [?] is around 4mm; Since there was no exact scale reference I couldn't edit in a scale bar. Thanks for any help with this! Edited January 11, 2020 by PointyKnight 1 Link to comment Share on other sites More sharing options...
bcfossilcollector Posted January 11, 2020 Share Posted January 11, 2020 @Troodon @jpc Link to comment Share on other sites More sharing options...
fossilsonwheels Posted January 11, 2020 Share Posted January 11, 2020 Neither of them look Acheroraptor to me. Both look Troodontid but I am no expert. Link to comment Share on other sites More sharing options...
PointyKnight Posted January 11, 2020 Author Share Posted January 11, 2020 @bcfossilcollector Good idea, thanks! @fossilsonwheels Exactly, the shape and orientation of the serrations didn't really look like Acheroraptor and much more like Troodontids in some aspects to me as well. Then again, I'm not sure if they can be identified as on a genus level either. If anyone has a good ID guide for Troodontid teeth, I'd love to read about it! Link to comment Share on other sites More sharing options...
Troodon Posted January 11, 2020 Share Posted January 11, 2020 I actually don't believe either tooth is a Troodontid. The distal denticle on Troodon teeth should be pointing toward the tip with they are not. The mesial serrations are also too tiny. I would have to have a density count of both edges but could be a dromaeosaurid just looking at visually The denticles are too close together for this to be Pectinodon, a posterior position being the only possible one. I think the preservation is too poor to positively assign this tooth. Would need to see the mesial carina. Could be a Dromaeosaurid or Richardoestesia. its indeterminate. here is a guide I put together on troodontid teeth 2 Link to comment Share on other sites More sharing options...
PointyKnight Posted January 11, 2020 Author Share Posted January 11, 2020 @Troodon Awesome, thanks! I tried accessing that guide earlier, but the link was broken for me somehow. Link to comment Share on other sites More sharing options...
Troodon Posted January 11, 2020 Share Posted January 11, 2020 You might find this of value, good comparative photos using specimens in my collection 3 Link to comment Share on other sites More sharing options...
PointyKnight Posted January 11, 2020 Author Share Posted January 11, 2020 16 minutes ago, Troodon said: You might find this of value, good comparative photos using specimens in my collection @Troodon Right! This is one of the posts I consulted prior to this; I thought that Tooth 2 had some similarities to this one particularly: Though compared to all the other teeth, the differences are pretty striking. I was wondering: Has the ID on this tooth changed since the original post was made? Link to comment Share on other sites More sharing options...
Troodon Posted January 11, 2020 Share Posted January 11, 2020 Not sure why I added that tooth I dont think it's one. The denticles are wrong. Need to change that image, sorry about that. Link to comment Share on other sites More sharing options...
PointyKnight Posted January 11, 2020 Author Share Posted January 11, 2020 3 minutes ago, Troodon said: Not sure why I added that tooth I dont think it's one. The denticles are wrong. Need to change that image, sorry about that. No problem! I'll keep an eye out for more positively identifiable features in the future. Thanks again! Link to comment Share on other sites More sharing options...
fossilsonwheels Posted January 11, 2020 Share Posted January 11, 2020 And that is why we call Frank in on these ID's lol 2 Link to comment Share on other sites More sharing options...
jpc Posted January 12, 2020 Share Posted January 12, 2020 Yeah, I appreciate being called to help, but troodon is the man for these. Frank actually does his homework and reads the scientific literature on these things. I am more of an educated guesser. Lance / Hell Creek mammals... now those I can help with. 2 Link to comment Share on other sites More sharing options...
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