Help: The Carcharias spectrum

[Frank Eaton]

I’m trying to ID the tooth at the center of this spectrum. To its’ left, Sand Tigers. To its’ right, makos. But the specimen in the middle is... a bit of both? 

[jcbshark]

I’d say lower mako

[Frank Eaton]

It certainly looks less like Carcharias the more I look at it. Thanks @jcbshark

[Frank Eaton]

How about this one @jcbshark? Trying to ID Carcharias uppers (or is it lowers?).

 

to its’ left, very curved roots. To its right, flatter roots. But the specimen in the middle is both larger and flatter than all the others. Is it still Carcharias? 

[jcbshark]

Not sure about that one @MarcoSr @sixgill pete @Al Dente

[Frank Eaton]

The tooth is 34 mm long, btw.

[Al Dente]

1 hour ago, Frank Eaton said:

to its’ left, very curved roots. To its right, flatter roots. But the specimen in the middle is both larger and flatter than all the others. Is it still Carcharias? 

I think they are all Carcharias, the one in question is a lateral tooth from a larger individual than the others.

[hemipristis]

3 hours ago, Frank Eaton said:

I’m trying to ID the tooth at the center of this spectrum. To its’ left, Sand Tigers. To its’ right, makos. But the specimen in the middle is... a bit of both? 

Looks like a Cosmopolitodus hastaalis lower..

 

Lower A1 photo from elasmo.com below

[MarcoSr]

If you want to see the Carcharias spectrum, the below dentition is an extant Carcharias taurus dentition from J-elasmo.

 

 

 

 

Marco Sr.