bthemoose Posted November 2, 2020 Share Posted November 2, 2020 After I remarked that the little tooth below (found on Morris Island, South Carolina) looked interesting on his trip report thread, forum member @Family Fun kindly gifted it to me, asking only that I help identify the species and share the result. My assessment is that this is an Isurus retroflexus posterior tooth, but hopefully others here can either confirm or correct that ID. This tooth has a non-serrated crown that is still fairly sharp and to my eyes at least has the raised labial platform indicative of I. retroflexus. There is a single cusplet on one side. Thanks for your help with this one, and thank you @Family Fun for your generosity! (Unfortunately, the tooth split down the middle on its journey to me, which is the crack you can see in the photos, but I was able to glue it back together.) 1 Link to comment Share on other sites More sharing options...
fifbrindacier Posted November 2, 2020 Share Posted November 2, 2020 I can't help you, but i find the colors of that tooth amazing. "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
Miocene_Mason Posted November 2, 2020 Share Posted November 2, 2020 I believe this is a thresher extreme posterior, likely giant thresher given the robustness. Unfortunately our reference material for positional variants in Giant threshers is scant and retros are fairly convergent with them so my ID comes with a grain of salt. 1 “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
bthemoose Posted November 2, 2020 Author Share Posted November 2, 2020 Thanks, @WhodamanHD! Now that you mention it, I can see that as a strong possibility. I'll send these photos to Dr. Kent at UMD to see if he might weigh in. Link to comment Share on other sites More sharing options...
bthemoose Posted November 3, 2020 Author Share Posted November 3, 2020 @WhodamanHD, do you think this one might be retroflexus? I found it today at Matoaka. 1 Link to comment Share on other sites More sharing options...
Miocene_Mason Posted November 4, 2020 Share Posted November 4, 2020 3 hours ago, bthemoose said: @WhodamanHD, do you think this one might be retroflexus? I found it today at Matoaka That would be my guess 1 “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
siteseer Posted November 4, 2020 Share Posted November 4, 2020 I would expect the crown to be a little flatter but maybe. 1 Link to comment Share on other sites More sharing options...
bthemoose Posted November 4, 2020 Author Share Posted November 4, 2020 12 hours ago, siteseer said: I would expect the crown to be a little flatter but maybe. Thanks for looking! Do you have other thoughts on what it might be? Link to comment Share on other sites More sharing options...
siteseer Posted November 4, 2020 Share Posted November 4, 2020 6 minutes ago, bthemoose said: Thanks for looking! Do you have other thoughts on what it might be? It's more likely an I. oxyrinchus posterior tooth. Jess 1 Link to comment Share on other sites More sharing options...
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