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Odd tooth from South Florida


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While picking through some micro-matrix from South Florida (Cookiecutter Creek) I came across an odd little tooth just a tad over 1 cm long. The odd thing about it is that this little tooth has distinct side cusps like you might see on an angustidens (but without the serrations).

 

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Normally, the only shark teeth that I encounter in Florida that have side cusps are Carcharias taurus (Sand Tiger) teeth. I also came across a small tooth that looks to be an upper lateral position from this species with a broken and worn root.

 

2018-11-01 21-23-02.jpg

 

Carcharias_taurus_1.jpg

 

The top tooth almost looks like a tiny mako tooth with a relatively flat unserrated blade, but the side cusps are out of place and I can't quite place this tooth. I'm sure I've been at this too long today and I'm missing something. Anybody have a good guess as to the identity of this tooth?

 

 

Cheers.

 

-Ken

 

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Upper anterior Negaprion teeth can have cusp like features on the shoulders. Here’s a jaw from the internet that has similar teeth.

B71714C9-5C73-458B-894A-9775C4977725.jpeg

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Ken

 

I agree with Eric that Negaprion acutidens, sicklefin lemon shark,  is a possibility.  However, they have serrations weakly developed on blades of upper teeth in individuals 1.4 m long and larger, and absent in small individuals 0.7 m or less and whose extant range isn't along the US coasts, Compagno 1984 .

 

Marco Sr.

"Any day that you can fossil hunt is a great day."

My family fossil website     Some Of My Shark, Ray, Fish And Other Micros     My Extant Shark Jaw Collection

image.png.9a941d70fb26446297dbc9dae7bae7ed.png image.png.41c8380882dac648c6131b5bc1377249.png

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Checking references to see if there are cusped species of Negaprion known from Florida. Also had Carcharoides catticus suggested as a possibility which I need to research.

 

I thought a labial view of this little oddity might make the side cusps more visible.

 

Cheers.

 

-Ken

 

2018-11-02 16-10-18.jpg

 

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