Unknown lamniform

[readinghiker]

Hello all!  I have around a dozen of these teeth. (Found in New Mexico. Coniacian.)

The very prominent lingual protuberance should be diagnostic, but I can't find a match.

Eostriatolamia tenuiplicatus looks good, but the crown has striations, and these don't.

Archaeolamna kopingensis also looked good, but the secondary cusps of this species are oriented away from the main cusp.

Leptostyrax macrorhiza also has labial striations. The narrowness of the cusps and crown also has me baffled. Any ideas?

 

[Anomotodon]

It's Pseudoscapanorhynchus compressidens. What age are these deposits?

[readinghiker]

Coniacian.  Could you point me to some papers?  Thanks!

[Anomotodon]

Sure, R-Z are P. compressidens. It's known from Coniacian too.

 

https://www.sciencedirect.com/science/article/pii/S0195667120302895

 

[readinghiker]

Thanks so much!  According to Shark References, this species is found in the Ukraine area.

This might be the first North American occurrence!