Hybodont?? New Jersey Cretaceous

[frankh8147]

Hello! 

 

I originally thought this was a Hybodont shark tooth when I found it (size is perfect) but I just realized that no other Hybodont tooth is my collection is curved like this. Is this possibly from a different part of the mouth or did I completely mid-label this one..

 

As always, all help is greatly appreciated!

@Carl

 

 

[frankh8147]

...I wanted to add, its a little thinner than the others too.

 

 

[Darktooth]

Hi Frank, I can't help with ID, I just wanted to say, you certainly find all the cool and unusual things.

[sixgill pete]

I am not sure what you have Frank, but I am fairly certain it is not a Hybodont tooth. I have 50 or more Meristodonoides novojerseyensis (same species as found in New Jersey) from 2 sites here in North Carolina where they are found and even the extremely worn ones are easily recognized as a Hybodont tooth.

[The Jersey Devil]

It’s a ray dermal denticle

[Archie]

+1 for ray dermal denticle, cool find!

[siteseer]

31 minutes ago, The Jersey Devil said:

It’s a ray dermal denticle

 

Yes, and it may be that rare form.  This one is angled higher than any I've seen from there before though I've seen only a couple.

 

@non-remanié

[frankh8147]

Well this just got cool! I don't have any even close to this big and robust. Here are typical examples.

 

Thanks everyone!

[frankh8147]

..

[The Jersey Devil]

1 hour ago, siteseer said:

 

Yes, and it may be that rare form.  This one is angled higher than any I've seen from there before though I've seen only a couple.

 

@non-remanié

Hi Jess,

Are you talking about Peyeria? This one doesn't look like a typical Peyeria, more like a denticle from a different part of the ray.

[siteseer]

On 12/23/2019 at 4:18 PM, The Jersey Devil said:

Hi Jess,

Are you talking about Peyeria? This one doesn't look like a typical Peyeria, more like a denticle from a different part of the ray.

 

I don't think it's Peyeria either but it looks similar.  Peyeria has been called a dermal denticle or an odd rostral spine.  It seems more like a denticle, the Cretaceous version of what we see on modern rays.

 

One thing to consider is that Peyeria is known from the Cenomanian of Egypt and Morocco but the NJ material is about 30 million years younger and sclerorhychid rostral spines are known from both.  it's possible that Peyeria is a sclerorhynchid dermal denticle form with some variation between genera and belongs to Onchopristis in the Cenomanian and Ischyrhiza in the Campanian-Maastrichtian of NJ deposits.  I think you suggested that in another thread.

 

Jess

[Carl]

+1 for dermal ossicle. Nice.

[Carl]

On 12/23/2019 at 6:33 PM, frankh8147 said:

..

I'm guessing you know this already but of the 6 pieces on the bottom, 2 are dermal ossicles and the other 4 are broken chondrichthyan vertebrae.

[frankh8147]

27 minutes ago, Carl said:

I'm guessing you know this already but of the 6 pieces on the bottom, 2 are dermal ossicles and the other 4 are broken chondrichthyan vertebrae.

I actually never made that distinction so thank you! Clearly, I need to brush up on my Ray knowledge.

[frankh8147]

19 hours ago, siteseer said:

 

I don't think it's Peyeria either but it looks similar.  Peyeria has been called a dermal denticle or an odd rostral spine.  It seems more like a denticle, the Cretaceous version of what we see on modern rays.

 

One thing to consider is that Peyeria is known from the Cenomanian of Egypt and Morocco but the NJ material is about 30 million years younger and sclerorhychid rostral spines are known from both.  it's possible that Peyeria is a sclerorhynchid dermal denticle form with some variation between genera and belongs to Onchopristis in the Cenomanian and Ischyrhiza in the Campanian-Maastrichtian of NJ deposits.  I think you suggested that in another thread.

 

Jess

 

I took a good look at it under magnification and am fairly certain it never had those ridges like I see on Peyeria so I think that should eliminate that possibility.

[hokietech96]

Great find.  So cool