Notorynchus ?

[Ludwigia]

Took another trip to one of my Miocene Burdigalian sites on my bike again today and I was just wondering if this set of teeth might come from a Notorynchus cepedianus shark.

 

 

[Ludwigia]

Come to think of it, here are 2 more which I found a while ago where I'm still not sure if they also belong to the genus Notorynchus. They're both sort of thick, which makes me unsure.

 

 

 

 

 

[ynot]

The first is a "yes".

The other two look like upper symphyseal teeth (same species).

[Ludwigia]

1 minute ago, ynot said:

The first is a "yes".

The other two look like upper symphyseal teeth (same species).

Thanks for the quick determination, Tony

[Ludwigia]

Please excuse me, but I'm having to revise these to N. primigenius. I'd forgotten completely about this website                    

[MarcoSr]

I agree that the first tooth is Notorynchus.  However, I don't think the next specimen is even a shark tooth because it is too rounded without a visible cutting edge but that may be due to water wear.  The second specimen really doesn't have the root or crown features of a Notorynchus upper parasymphyseal tooth.  It looks more like a ray dermal denticle to me.  But pictures can be very deceiving.  See the extant Notorynchus cepedianus jaw below from elasmo.com:

 

 

 

 

The third specimen is really interesting.  It is difficult to tell from the pictures but If a shark tooth it could be a cetorhinus (but they have a cutting edge) or even something like a ray tooth from a manta.

 

Marco Sr.

[Ludwigia]

On 11.8.2018 at 4:52 PM, MarcoSr said:

I agree that the first tooth is Notorynchus.  However, I don't think the next specimen is even a shark tooth because it is too rounded without a visible cutting edge but that may be due to water wear.  The second specimen really doesn't have the root or crown features of a Notorynchus upper parasymphyseal tooth.  It looks more like a ray dermal denticle to me.  But pictures can be very deceiving.  See the extant Notorynchus cepedianus jaw below from elasmo.com:

 

 

 

 

The third specimen is really interesting.  It is difficult to tell from the pictures but If a shark tooth it could be a cetorhinus (but they have a cutting edge) or even something like a ray tooth from a manta.

 

Marco Sr.

Thanks for your help Marco. Sorry it took so long to answer, but I just noticed your post now.