Show us your rarest shark’s teeth!

[Tidgy's Dad]

On 12/19/2018 at 1:25 AM, Anomotodon said:

Even though it is a partial, my newest find is probably one of the rarest ones in my collection (1st find of this species in 8 years of collecting at that location). It is a Paraorthacodus sp. tooth from the Eocene (!!!) of Kyiv clay, Ukraine. 

For those who are not familiar with this genus (Paraorthacodus seems to be less common in NA than in Europe), it belongs to a currently extinct order Synechodontiformes which is known at least from the Triassic. Most of them died out in the Cretaceous, in Paleocene relict Eychalodus and Paraorthacodus eocaenus still can be found, but I have never seen Eocene specimens, and mine is pretty big for this genus! Obvious question is - well, isn't P. eocaenus called eocaenus for a reason? Apparently not. It seems that Leriche, 1902 described it from Paleocene of Belgium.

 

If anybody knows of such examples in the literature or private collections please let me know  

 

And an example of P. recurvus from Albian (Early Cretaceous) of Ukraine

 

 

Really nice!

Congratulations.

Good photos too. 

[Tidgy's Dad]

On 12/19/2018 at 5:58 AM, David in Japan said:

This one is also very cool.

Ptychodus mamillaris from the same formation. It is the only one i have found. It is difficult to see all the details because the tooth is dark but it has some wear trace on the top which makes it even more special.

Nice finds, David! 

[Tidgy's Dad]

On 12/19/2018 at 7:43 AM, DanKurek said:

Here are my rarest shark teeth. Four Hemigaleidae teeth collected from Narrawong, Victoria. Pliocene in age. Only two Hemigaleidae teeth have ever been collected in the state of Victoria  (According to the Museums Victoria Collections and Australian Museum Collections). Now it is 6 . Been contemplating donating them but have not heard a response from Melbourne Museum. Anyone have any advice?

Congratulations on these rare and interesting teeth.

If they won't respond try again and if they still don't respond, keep them. 

And try again in a year or two. 

[Untitled]

40 minutes ago, Tidgy's Dad said:

Nice tooth! 

Very interesting pathology.

Thank you, I really appreciate it!

[fossilsonwheels]

Pics 1 & 2 are my rarest shark tooth. I have three of these, all around 1 cm and I am not sure what species they are from. They are the only shark teeth I have found in Northern California which is why I consider them rare. They ended up in a net while I was doing an aquatic invertebrate survey of Big Chico Creek with some students. I was told these were probably from the Chico Formation which would put them around 75 million years old and might be a Sand Tiger of some sort.

 

Pic #3 are Stethacanthus altonensis teeth from Oklahoma. I really do not know if Stethacanthus teeth are even considered rare but I thought I would post it here and find out.

[Praefectus]

My rarest shark tooth is a Carcharodon hubbelli from Peru. It's just over 2 inches and has some weird transitional serrations.