hxmendoza Posted July 12, 2021 Share Posted July 12, 2021 (edited) Hi folks. My turn to ask for ID help. I’m more of a dinosaur tooth and fossil guy. My friend gifted me these fossil shark teeth. Can you take a look and help me with these? I own a couple Meg teeth and other Shark teeth, but these are giving me a little trouble, or I’d like verification. The first two (A) and (B) have a bourlette, but proportionately large serrations like a Great White. Except GW teeth don’t have bourlettes. I believe (C) and (D) May be Carcharocles hastalis. Are they? I believe (E) is a Mako. But what species? Lastly, is (F) Carcharocles angustidens? Sorry, no locality info on any. Thank you all for looking. Edited July 12, 2021 by hxmendoza Link to comment Share on other sites More sharing options...
Thomas.Dodson Posted July 12, 2021 Share Posted July 12, 2021 A and B: I'd guess Otodus megalodon or Otodus chubutensis. Unfortunately, although cusps and serrations are typical diagnostic characteristics that can separate the two, they aren't 100% accurate and cuspless and cusped versions of both exist. Without locality info you'll probably never be 100% sure on them. See this paper for more info. The transition between Carcharocles chubutensis and Carcharocles megalodon (Otodontidae, Chondrichthyes): lateral cusplet loss through time You're correct on C and D, they're Cosmopolitodus/Carcharodon hastalis. Do I see very weak serrations on E? I'm pretty confident it is also Cosmopolitodus and weak serrations would point to Cosmopolitodus escheri. Without any location I'd suspect you're correct on F. Those round cusps are pretty typical of Otodus angustidens. Link to comment Share on other sites More sharing options...
hxmendoza Posted July 12, 2021 Author Share Posted July 12, 2021 4 minutes ago, Thomas.Dodson said: A and B: I'd guess Otodus megalodon or Otodus chubutensis. Unfortunately, although cusps and serrations are typical diagnostic characteristics that can separate the two, they aren't 100% accurate and cuspless and cusped versions of both exist. Without locality info you'll probably never be 100% sure on them. See this paper for more info. The transition between Carcharocles chubutensis and Carcharocles megalodon (Otodontidae, Chondrichthyes): lateral cusplet loss through time You're correct on C and D, they're Cosmopolitodus/Carcharodon hastalis. Do I see very weak serrations on E? I'm pretty confident it is also Cosmopolitodus and weak serrations would point to Cosmopolitodus escheri. Without any location I'd suspect you're correct on F. Those round cusps are pretty typical of Otodus angustidens. Thank you Thomas! Link to comment Share on other sites More sharing options...
hxmendoza Posted July 12, 2021 Author Share Posted July 12, 2021 21 minutes ago, Thomas.Dodson said: Do I see very weak serrations on E? I'm pretty confident it is also Cosmopolitodus and weak serrations would point to Cosmopolitodus escheri. I don’t believe I see week serration denticles. But with sharks I’m not well versed at all on what’s considered non-serrated and weakly serrated. I tried taking closeup pics. Best I can do on them. 26 minutes ago, Thomas.Dodson said: See this paper for more info. The transition between Carcharocles chubutensis and Carcharocles megalodon (Otodontidae, Chondrichthyes): lateral cusplet loss through time Thank you for the paper! Link to comment Share on other sites More sharing options...
Al Dente Posted July 12, 2021 Share Posted July 12, 2021 (edited) I’m fairly confident that tooth E is Carcharodon hastalis from the Pungo River Formation, Lee Creek Mine. The matrix looks like the typical black phosphatic sand in limestone from the Pungo. Edited July 12, 2021 by Al Dente 2 Link to comment Share on other sites More sharing options...
Thomas.Dodson Posted July 12, 2021 Share Posted July 12, 2021 Yeah, I'm not seeing the serrations anymore so I'd also go C. hastalis. 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now