NJ Symphyseal? Archaeolamna and Pseudocorax affinis?!!

[The Jersey Devil]

Hi everyone,

I think I found a year maker recently, and in good time!

 

The 1st tooth pictured is what I am praying is a Pseudocorax affinis, which is incredibly rare here. 

The 2nd tooth is an Archaeolamna, I just need confirmation that it’s a symphyseal.

Both teeth are Late Cretaceous.

 

Edit: I forgot to add the size,

1st tooth: 12 mm, 2nd tooth: 10 mm

@non-remanié @Al Dente @siteseer

Happy Holidays!

1st tooth:

 

[The Jersey Devil]

2nd tooth:

 

 

[sixgill pete]

I agree with Psuedocorax for the first tooth. Though I'm no expert, but I do believe that is a correct ID. Very nice find.

 

The second tooth, I would lean towards symphyseal, but lets see what other have to say.

 

@MarcoSr

[MarcoSr]

13 minutes ago, sixgill pete said:

I agree with Psuedocorax for the first tooth. Though I'm no expert, but I do believe that is a correct ID. Very nice find.

 

The second tooth, I would lean towards symphyseal, but lets see what other have to say.

 

@MarcoSr

 

I agree that the first tooth looks like a Psuedocorax.  Really nice specimen.

 

From the features of the second tooth, it looks like either a symphyseal or an intermediate tooth.

 

Marco Sr.

[The Jersey Devil]

1 hour ago, sixgill pete said:

I agree with Psuedocorax for the first tooth. Though I'm no expert, but I do believe that is a correct ID. Very nice find.

 

The second tooth, I would lean towards symphyseal, but lets see what other have to say.

 

@MarcoSr

 

35 minutes ago, MarcoSr said:

 

I agree that the first tooth looks like a Psuedocorax.  Really nice specimen.

 

From the features of the second tooth, it looks like either a symphyseal or an intermediate tooth.

 

Marco Sr.

 

Thanks guys! It might be a couple decades or never until I find another complete NJ Pseudocorax.

 

Marco, is there any way to distinguish symphyseal and intermediate Archaeolamna teeth? I thought Archaeolamna intermediate teeth looked pretty different.

[Dryptosaur]

Here is a tooth I found  years ago in New Jersey which appears to be a Pseudocorax also. 

[non-remanié]

Nice!  Congrats Joseph.   

[The Jersey Devil]

1 hour ago, Dryptosaur said:

Here is a tooth I found  years ago in New Jersey which appears to be a Pseudocorax also. 

Yeah it looks like another Pseudo. Could you please post a pic of the lingual side? The nutrient groove should confirm it 

[The Jersey Devil]

1 hour ago, non-remanié said:

Nice!  Congrats Joseph.   

Thanks Steve! I’m glad it’s not another Squali.

 

What are your thoughts on the other tooth? Is it symphyseal like I originally thought or an intermediate?

 

Btw I sent you a PM some time ago.

[MarcoSr]

11 hours ago, The Jersey Devil said:

 

 

Thanks guys! It might be a couple decades or never until I find another complete NJ Pseudocorax.

 

Marco, is there any way to distinguish symphyseal and intermediate Archaeolamna teeth? I thought Archaeolamna intermediate teeth looked pretty different.

 

Looking at the recontructed dentition (see below) of Archaeolamna  from Underwood, C. and S. Cumbaa, 2010. Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada. Palaeontolgy.Vol. 53(4): 903-944. your tooth looks more like the upper or lower parasymphyseal  tooth than the upper intermediate tooth.  There is a lot of variation in these parasymphyseal teeth.

 

Link to the paper which has a good text description of the parasymphyseal and intermediate teeth:

 

 

https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1475-4983.2010.00969.x

 

 

 

 

 

You can see the parasymphyseal and intermediate teeth better in the below figure.

 

 

 

 

I can't locate my copy of Cook, T., M Newbrey, A. Murray, M. Wilson, K Shimada, G. Takeuchie and J. Stewart, 2011. A partial skeleton of the Late Cretaceous lamniform shark, Archaeolamna kopingensis, from the Pierre Shale of western Kansas, U.S.A. Journal of Vertebrate Paleontology, 31: 1, 8-21 that Dr. Newbrey gave to me.   In this paper they depict the Archaeolamna dentition using articulated material. You need to check that dentition also.  From the abstract:

 

"The specimen includes portions of the upper and lower jaws with articulated teeth. The dentition consists of two files of upper and lower anterior teeth that, together with a single file of intrabullar intermediate teeth, are housed in a dental bulla, as well as multiple files of lateral teeth, along with at least two files of lower symphysial teeth and a single file of upper symphysial teeth. The intrabullar intermediate tooth is slightly shorter than the other anterior teeth and has a median cusp with distinctive distal curvature. "

 

 

Marco Sr.

Edited December 28, 2019 by MarcoSr
added figure and abstract and paper link

[Al Dente]

8 hours ago, The Jersey Devil said:

The 1st tooth pictured is what I am praying is a Pseudocorax affinis, which is incredibly rare here.

Nice tooth.

[siteseer]

Wow, that first tooth may be the first P. affinis I've ever seen from North America.  I'm going to have to look through some boxes but I think the only one I have is from Holland.

 

Yes, I think the second tooth is a parasymphyseal of Archaeolamna.  It's the right size and root shape.

 

Jess

[Dryptosaur]

On 12/28/2019 at 12:29 AM, The Jersey Devil said:

Yeah it looks like another Pseudo. Could you please post a pic of the lingual side? The nutrient groove should confirm it 

 

Here is the other side of mine.

 

[The Jersey Devil]

5 hours ago, siteseer said:

Wow, that first tooth may be the first P. affinis I've ever seen from North America.  I'm going to have to look through some boxes but I think the only one I have is from Holland.

 

Yes, I think the second tooth is a parasymphyseal of Archaeolamna.  It's the right size and root shape.

 

Jess

They’ve been found before in the US, at least in NJ and NC.

[The Jersey Devil]

48 minutes ago, Dryptosaur said:

 

Here is the other side of mine.

 

Yeah that’s definitely another Pseudo!