Carcharhinus vs Negaprion

[Frank Eaton]

I’m zeroing in this weekend on a pile of small unorganized teeth from Aurora. These easiest to separate out first are these easy to spot, straight rooted, straight crowned, small laterals.

 

I’ve always called these Lemon Sharks (Negaprion eurybathrodon) but as I read further, they look a lot like Carcharhinus brachyurus as well.

 

any opinion before I move on from this nightmare and focus on something else?

[Al Dente]

You are right that they aren’t Negaprion. Lower Carcharhinus teeth are very difficult to identify to species.

[Frank Eaton]

Thanks @Al Dente. That actually helps me identify some of the random uppers I have lying around. 

[hemipristis]

5 hours ago, Al Dente said:

You are right that they aren’t Negaprion. Lower Carcharhinus teeth are very difficult to identify to species.

+1. Carcharhinid lowers.

 

Uppers are difficult enough. Lowers are mind-numbing.  

 

My uppers from LC I have segregated by tentative ID, but the lowers are all in one box. 

[Frank Eaton]

Yeah @hemipristis, I’ve been at it all day and here’s what I’m still staring at: 

 

I’ve also put all of the lowers into a single bin, but I’ve started bins for C. perezii upper laterals and one for C. brachyurus uppers, which I’m fairly confident about. Ain’t seeing much outside of that.