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I got this tooth from a megalodon tooth collector from South Carolina. They said they collected it from Cooper River alongside megalodon teeth, but weren't certain as to what it came from. To me it looks like an incisor tooth from a basilosaurid, but I haven't seen anything quite like this from South Carolina. It is just over 2-3/5" long and has carinae without serrations (denticles). I could see crocodilian as a possibility as well, but wanted to get some insight from others.

Hi all, I'm quite certain this is suchomimus, but just to be sure, what say people here? The base has the elongated shape of suchomimus, and it has carinae on both sides as far as I can tell @Troodon

Hi all, here is a spinosaur rooted tooth with a strange cavity sort of thing at the bottom of the partial root. Does anyone know if it's a hike for a new tooth? Or is it just some kind of damage It's from the kemkem, 7.5 cm long

Hi all, I recently got into a discussion on the Dutch fossil forum about the definition of the term "carina", which my conversation partner equated to "the cutting edge of a tooth". They then further went on to claim crocodiles don't have carinae but rather apicobasal ridges that span the length of the tooth crown. Now I've used the term lots over the years and know @Jesuslover340 has also used carinae in the context of crocodile teeth. But as I can't find a singular definition of the term as pertains to teeth online, I was wondering how the term is officially defined - whether it might be possible that I may have been using it wrongly and under the wrong assumptions. So, basically: What are carinae? Are they the cutting edges of a tooth, or do they include the apicobasal ridges that are commonly found on the mesial or dorsal end of reptile teeth? Are carinae necessarily serrated? Is use of the term "carina" taxonomically restricted? Does the term apply to crocodiles, for example? I possible, I would like to try and get at an academically recognized definition of the term. Or, failing that, get insight into the academic discussion as to its meaning.