FossilizedJello Posted June 17, 2020 Share Posted June 17, 2020 Its still very hard to me to tell between the two when discussing the 1.5-3" range. I know angustidens have cusp but not all of them necessarily do. I know angustidens are also more triangle shaped but really that is not given as megs can also have that depending on tooth location. I attached a picture of some mixed ones and I still dont know which are which. My guesses would be the yellow top one, the black one right next to it, and the bottom left black tooth. The rest are megs? Open to discussion 1 Link to comment Share on other sites More sharing options...
Kikokuryu Posted June 17, 2020 Share Posted June 17, 2020 I think all Carcharocles angustidens do have cusps and if it doesn't, it means they broke off. It's Carcharocles chubutensis that can be a bit more vague between it and megs with vestigial cusps. 2 Link to comment Share on other sites More sharing options...
Huntonia Posted June 17, 2020 Share Posted June 17, 2020 Both are actually currently classified under Otodus. The ones I circled in red are definitely Angustiden, I think the one in yellow might be a broken angy as well, but I'm not sure. The rest I'm pretty sure are megs. The differences are small and subtle, the shape of the bourlette is a good indicator if I remember right. A good way to help pick up on the difference that helped me was to watch blackriverfossils' videos. Eventually after seeing enough of both you start to unconsciously pick up on the differences. Plus it's great entertainment 2 Link to comment Share on other sites More sharing options...
FossilizedJello Posted June 17, 2020 Author Share Posted June 17, 2020 11 hours ago, Kikokuryu said: I think all Carcharocles angustidens do have cusps and if it doesn't, it means they broke off. It's Carcharocles chubutensis that can be a bit more vague between it and megs with vestigial cusps. Yeah, right chubs are also another tough one in the mix between megs and chubs. Angustiden seems actually easier to distinguish once you know what to look for. 9 hours ago, Huntonia said: Both are actually currently classified under Otodus. The ones I circled in red are definitely Angustiden, I think the one in yellow might be a broken angy as well, but I'm not sure. The rest I'm pretty sure are megs. The differences are small and subtle, the shape of the bourlette is a good indicator if I remember right. A good way to help pick up on the difference that helped me was to watch blackriverfossils' videos. Eventually after seeing enough of both you start to unconsciously pick up on the differences. Plus it's great entertainment Ah yeah, I totally see what you are saying and have to agree with your ID. Along with the bourlette though, I think the enamel is very telling. Yeah I watch his vids sometimes :D. How about the upper yellow tooth. The enamel and shape just looks different from the other megs? Perhaps its a chub? Btw, thanks for your information. Link to comment Share on other sites More sharing options...
Shellseeker Posted June 17, 2020 Share Posted June 17, 2020 They might ALL be C. Megalodon. Where did they come from? There is a wealth of info in this thread http://www.thefossilforum.com/index.php?/topic/71286-peace-river-surface-finds/ and this one: 1 The White Queen ".... in her youth she could believe "six impossible things before breakfast" Link to comment Share on other sites More sharing options...
Rustdee Posted June 17, 2020 Share Posted June 17, 2020 Shellseeker is right. You need to know the formation that these teeth come from to determine an age. Unfortunately, morphology tells us very little except that the tooth is in the Otodus genus. O. angustidens can have no cusps and O. megalodon can have cusps. These teeth represent chronospecies that evidence gradual change over time and substantial individual variation in any given tooth. 1 Link to comment Share on other sites More sharing options...
FossilizedJello Posted June 17, 2020 Author Share Posted June 17, 2020 32 minutes ago, Shellseeker said: They might ALL be C. Megalodon. Where did they come from? There is a wealth of info in this thread http://www.thefossilforum.com/index.php?/topic/71286-peace-river-surface-finds/ and this one: I dont own these fortunately. Just figured it was a good example. Good thread, will check. 23 minutes ago, Rustdee said: Shellseeker is right. You need to know the formation that these teeth come from to determine an age. Unfortunately, morphology tells us very little except that the tooth is in the Otodus genus. O. angustidens can have no cusps and O. megalodon can have cusps. These teeth represent chronospecies that evidence gradual change over time and substantial individual variation in any given tooth. Didnt realize megs can have cusp, very interesting. 2 Link to comment Share on other sites More sharing options...
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