Goblin or something else

[sharko69]

Found this little tooth this weekend. I’m sure it must be a S. raphiodon but the cusplets come directly out of a broader based blade. Not like the others I usually find. May just be because it is a juvenile?

[Dirtlark]

I think it looks like a sand shark, especially with how narrow and angular it is, as well as the striations. I think the coloring might help pinpoint what type of sand shark. Hope this helps.

[siteseer]

5 hours ago, Dirtlark said:

I think it looks like a sand shark, especially with how narrow and angular it is, as well as the striations. I think the coloring might help pinpoint what type of sand shark. Hope this helps.

 

I think it's a sand shark too - Carcharias sp.  Without size or site info it's hard to say beyond that. 

[Ludwigia]

6 hours ago, Dirtlark said:

I think it looks like a sand shark, especially with how narrow and angular it is, as well as the striations. I think the coloring might help pinpoint what type of sand shark. Hope this helps.

 

@siteseer

I have been under the impression that the striations are a sign that a tooth belongs rather to Mitsukurina than to Carcharias?

[Coco]

Hi,

 

@sharko69 What means S. in "S. raphiodon" ? Scapanorhinchus ? Please write the full name when you first cite it in a subject. Not everyone knows every shark at every geological level in the world

 

Coco

[sharko69]

39 minutes ago, Coco said:

Hi,

 

@sharko69 What means S. in "S. raphiodon" ? Scapanorhinchus ? Please write the full name when you first cite it in a subject. Not everyone knows every shark at every geological level in the world

 

Coco

Yes, sorry. Scapanorynchus raphiodon. The tooth was found in North Texas, Eagle Ford and is just over one cm in length.

[Coco]

 

Coco

[siteseer]

On 11/26/2019 at 2:08 AM, Ludwigia said:

 

@siteseer

I have been under the impression that the striations are a sign that a tooth belongs rather to Mitsukurina than to Carcharias?

 

Hi Roger,

 

There are species of Carcharias with lingual striations.  I assumed the tooth is from the late Cretaceous of Texas, and since Mitsukurina is not known earlier than the Middle Eocene, I didn't consider that a possibility.  Even if it were a possibility, I would expect Mitsukurina to have a more slender cusp relative to the height with a different root too.  It is a very elusive genus in the fossil record likely due to a longtime preference for the open ocean and deepwater.

 

Jess

[Ludwigia]

41 minutes ago, siteseer said:

 

Hi Roger,

 

There are species of Carcharias with lingual striations.  I assumed the tooth is from the late Cretaceous of Texas, and since Mitsukurina is not known earlier than the Middle Eocene, I didn't consider that a possibility.  Even if it were a possibility, I would expect Mitsukurina to have a more slender cusp relative to the height with a different root too.  It is a very elusive genus in the fossil record likely due to a longtime preference for the open ocean and deepwater.

 

Jess

Thanks for the clarification, Jess.