Fin Lover Posted January 28 Share Posted January 28 (edited) I have two teeth that I found previously somewhere in the Summerville area and stuck in a riker mount. Looking through them today, I noticed one that I did not recognize. In comparing it to others in the mount, I noticed another one that has similar enamel on the root (labial side), although the root is much more curved overall. Can anyone help with these? My areas are heavily Oligocene but some have either an overlying Pliocene formation or Pleistocene lag deposit that produces some megs, great whites, etc. Tooth 1: * 14 mm slant height x 14 mm across * Root is very "built up" on the lingual side * Has strip of enamel over the root on the labial side (similar to the "shelf" on Isurus retroflexus) * Has very small cusps * No nutrient grove or foramen My best guess would be a thresher of some sort, but I could be way off. Tooth 2: * 13mm slant height x 11mm across *Very curved root, not as thick as first tooth *Enamel "ledge" on root on labial side * Has very lumpy tiny cusps * It either has an off-center nutrient grove, or just a conveniently placed line of wear Thank you so much! Edited January 29 by Fin Lover Updated title 1 Link to post Share on other sites
hemipristis Posted January 28 Share Posted January 28 Both are Alopiids (thresher shark), genus Alopias. If I were to posit on species, it would be either A. Latidens or A. Superciliosis. But I’ll let those more familiar with the fauna make the call 1 1 Link to post Share on other sites
Meganeura Posted January 28 Share Posted January 28 3 hours ago, hemipristis said: Both are Alopiids (thresher shark), genus Alopias. If I were to posit on species, it would be either A. Latidens or A. Superciliosis. But I’ll let those more familiar with the fauna make the call Latidens has cusps? I’ve found 5 of em here in Florida and not a single one has a cusp. Link to post Share on other sites
hemipristis Posted January 28 Share Posted January 28 19 minutes ago, Meganeura said: Latidens has cusps? I’ve found 5 of em here in Florida and not a single one has a cusp. I’m covering my bases…. I’ve only found one. I’m not very familiar with Oligocene and Eocene teeth Link to post Share on other sites
Meganeura Posted January 28 Share Posted January 28 (edited) 1 hour ago, hemipristis said: I’m covering my bases…. I’ve only found one. I’m not very familiar with Oligocene and Eocene teeth Made me go pull out my A. latidens teeth for comparison! Idk if they changed from Oligocene -> Miocene/Pliocene, but mine definitely do not have cusps. Though maybe I’m miss-IDing these? I know they’re threshers. Alopias for sure. Edit: did some searching, seems Oligocene A. Latidens can have vestigial cusplets while Miocene ones are unlikely but may also still have them. Edited January 28 by Meganeura 1 1 Link to post Share on other sites
Meganeura Posted January 28 Share Posted January 28 This may be of help! Link to post Share on other sites
Fin Lover Posted January 28 Author Share Posted January 28 (edited) 1 hour ago, Meganeura said: This may be of help! Thanks, I saw this post and paper yesterday. My local book lists A. grandis and A. vulpinus, but the thresher pictures I've found vary so much, that I wasn't sure. I guess there is a lot of variation in them, including between male and female. I just wasn't seeing any pictures with a thick root like on my first tooth. But, I likely got this tooth before it made it to the creek, so maybe it just doesn't have much wear. Edited January 28 by Fin Lover 1 Link to post Share on other sites
sixgill pete Posted January 30 Share Posted January 30 (edited) Here in N.C., we find cusped Alopias teeth in the Oligocene Belgrade Formation. They have been compared to a European species; Alopias exigua, however they are I.D. only as Alopias sp. Your teeth are very very similar to those teeth. In my opinion your best I.D. at this point is Alopias sp. Edited January 30 by sixgill pete 1 1 1 Link to post Share on other sites
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