DatFossilBoy Posted April 27, 2019 Share Posted April 27, 2019 Hey guys, I have purchased another small theropod tooth from Hell Creek fm. This one is a little bit bigger (0,8cm) and seems to be more slender than the tooth identified by @Troodon as Dakotararaptor. It will be harder to ID since the serrations on the mesial edge are present, just quite worn. Mesial edge count will be tough and rough... The serration count midline for the distal edge is 6/mm. Thanks for any input and don’t hesitate to ask me fore more pictures. Kind rgards . Link to comment Share on other sites More sharing options...
fossilsonwheels Posted April 27, 2019 Share Posted April 27, 2019 I can not help with the ID but that is another little beauty for sure ! 1 Link to comment Share on other sites More sharing options...
Troodon Posted April 27, 2019 Share Posted April 27, 2019 You should be able to fo a density count on the mesial edge will need that. Can you take straight in photos of the crown and one of the mesial edge. Link to comment Share on other sites More sharing options...
DatFossilBoy Posted April 28, 2019 Author Share Posted April 28, 2019 13 hours ago, Troodon said: You should be able to fo a density count on the mesial edge will need that. Can you take straight in photos of the crown and one of the mesial edge. Is this what you asked for? It is very hard to give a serration count for the mesial edge since the serrations are so worn, but a rough estimate would be around 7/mm. Thanks for the help. Regards. Link to comment Share on other sites More sharing options...
JoeS Posted April 28, 2019 Share Posted April 28, 2019 Hi, I do see faint ridges on the side of the tooth, so Acheroraptor would be a good guess. 1 Link to comment Share on other sites More sharing options...
DatFossilBoy Posted April 28, 2019 Author Share Posted April 28, 2019 28 minutes ago, JoeS said: Hi, I do see faint ridges on the side of the tooth, so Acheroraptor would be a good guess. Yeah I was thinking that too. Thanks! Do other dromaeosarid teeth have ridges or is it only on Acheroraptor? Hopefully Troodon or other people will be able to tell for sure or not. Regards. Link to comment Share on other sites More sharing options...
Troodon Posted April 28, 2019 Share Posted April 28, 2019 You do a great job with the photos thank you. A hard to call like all isolated theropod teeth but would lean toward Nanotyrannus for the following reasons, lingual twist of mesial carina (not a characteristic of these Dromaeosaurid's), midline pinch in cross-section of base, ratio of serration density close to one and denticles look Tyrannosaurid. The ridges on the crown probably reflect its a maxillary tooth. My two cents.... 2 Link to comment Share on other sites More sharing options...
DatFossilBoy Posted April 28, 2019 Author Share Posted April 28, 2019 9 minutes ago, Troodon said: You do a great job with the photos thank you. A hard to call like all isolated theropod teeth but would lean toward Nanotyrannus for the following reasons, lingual twist of mesial carina (not a characteristic of these Dromaeosaurid's), midline pinch in cross-section of base, ratio of serration density close to one and denticles look Tyrannosaurid. The ridges on the crown probably reflect its a maxillary tooth. My two cents.... Wow that’s so cool! Thank you very much. Very interesting. Would it mean it is from a juvenile Nano? Kind regards. Link to comment Share on other sites More sharing options...
Troodon Posted April 28, 2019 Share Posted April 28, 2019 Oh yes juvie 1 Link to comment Share on other sites More sharing options...
JoeS Posted April 28, 2019 Share Posted April 28, 2019 55 minutes ago, Troodon said: You do a great job with the photos thank you. A hard to call like all isolated theropod teeth but would lean toward Nanotyrannus for the following reasons, lingual twist of mesial carina (not a characteristic of these Dromaeosaurid's), midline pinch in cross-section of base, ratio of serration density close to one and denticles look Tyrannosaurid. The ridges on the crown probably reflect its a maxillary tooth. My two cents.... my bad, did not see the mesial denticle count, looks like much more of a difference in the images. Any advice on where I could read up on ridges and tooth position as you mentioned? Link to comment Share on other sites More sharing options...
DatFossilBoy Posted April 28, 2019 Author Share Posted April 28, 2019 27 minutes ago, Troodon said: Oh yes juvie Thanks! Link to comment Share on other sites More sharing options...
Troodon Posted April 28, 2019 Share Posted April 28, 2019 1 hour ago, JoeS said: my bad, did not see the mesial denticle count, looks like much more of a difference in the images. Any advice on where I could read up on ridges and tooth position as you mentioned? The biggest reason is that mesial twist which is not found in Dakotaraptor or Acherorapter but the density is also very important. Here a paper that may help on Tyrannosaurid tooth positions https://www.app.pan.pl/article/item/app50-757.html 1 Link to comment Share on other sites More sharing options...
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