(shark tooth) Isurus? Transitional tooth?

[Flandricus]

Hi! 

 

Ive got a shark tooth from the sands of Antwerp. To me it looks like a type of Isurus, but the crown ends pretty wide and with blades that look and feel semi-serrated. From a distance it looks like it has a nutrient groove, but when looking closer it doenst. There is also no nutrient pore. 

 

So that got me wondering what this could be? Maybe Isurus, maybe transitional tooth? 

 

Thanks! 

[Othniel C. Marsh]

Looks like Isurus, but I'm not sure which species.

[dries85]

I think this is an Isurus oxyrinchus lower antero-lateral tooth. They sometimes appear with slight serrations on the shoulders of the root or even little cusps. Transitional teeth, like Carcharomodus escheri or Isurus subserratus would have a different shape and the serrations tend to appear closer to the tip of the crown..

 

Nice find!

 

Dries

[Darktooth]

Possibly retroflexus.

[dries85]

6 minutes ago, Darktooth said:

Possibly retroflexus.

True, but i'd expect a more pronounced ridge on the labial side for a retroflexus tooth in that good shape. I've always considered the sad smiley where the crown meets the root more as an oxyrinchus feature. But don't take my word for it, i'm doing just a well-considered guess here. Glad u asked anyway 😉

Edited November 2 by dries85

[Flandricus]

35 minutes ago, dries85 said:

I think this is an Isurus oxyrinchus lower antero-lateral tooth.

 

Makes sense, thank you!

[Shellseeker]

4 hours ago, dries85 said:

I think this is an Isurus oxyrinchus lower antero-lateral tooth. They sometimes appear with slight serrations on the shoulders of the root or even little cusps. Transitional teeth, like Carcharomodus escheri or Isurus subserratus would have a different shape and the serrations tend to appear closer to the tip of the crown..

 

Nice find!

 

Dries

Interesting. I have seen lots of transitional Megs,  but only one Transitional Mako,  almost 9 years back.... Came out of a creek.

[Flandricus]

On 11/3/2024 at 2:39 AM, Shellseeker said:

Interesting. I have seen lots of transitional Megs,  but only one Transitional Mako,  almost 9 years back.... Came out of a creek.

 

This looks very interesting! Thanks for sharing.