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FreshWaterSharK

What kind of teeth are these? Found in Virginia

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FreshWaterSharK

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Praefectus
2 minutes ago, caldigger said:

I'll try.

Starting with the orange one and going clockwise.

-Carcharodon megalodon

-Carcharocles auriculatus

-C. auriculatus

-C. auriculatus

-C. megalodon

I'm sure I'll be corrected, but that's my guess.

I agree with the species IDs. @caldigger You are using both carcharodon and carcharocles to describe the mega toothed sharks?:headscratch:

 

I believe the currently accepted genus for the whole family is Otodus.

 

Starting from orange: 

Otodus megalodon

Otodus auriculatus

Otodus auriculatus

Otodus angustidens

Otodus megalodon

 

 

 

 

 

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caldigger

Sorry, just reading off labels. A bit "old school" I guess. I'll correct.

Kindly excuse my ignorance, but please enlighten me and anyone else reading this why the fourth one is

O. angustidens over the auriculatus.

They looked the same to me. :headscratch:

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Praefectus
20 minutes ago, caldigger said:

Sorry, just reading off labels. A bit "old school" I guess. I'll correct.

Kindly excuse my ignorance, but please enlighten me and anyone else reading this why the fourth one is

O. angustidens over the auriculatus.

They looked the same to me. :headscratch:

 

I miss the "old school." I still refer to C. hastalis as giant makos. All the name debates are too difficult to keep up with. 

 

I could be wrong, but I made the judgement on 4 based off the cusp. The cusps on O. angustidens protrude less than those on O. auriculatus. Now that I'm looking at it closer, I think 3 might also be O. angustidens. I can't tell if 3 has a double cusp or if it has been damaged and the cusp got nicked. 

 

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caldigger

I think some better focused pictures with improved lighting may be in order.

They're kinda dark to see good details.

 

Since I don't see these teeth on this side of the States, my familiarity is a bit lacking.  Thanks for your insights.

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Praefectus

I agree. Some more pictures would be helpful. 

 

I'm still not entirely sure how to differentiate between angys and rics. It seems like every expert uses a different formula. Below is how I tell them apart. If anyone has a better method, I'm all ears. 

 

O. otodus - Unserrated.

O. mugodzharicus - Early serrations. Appear as very fine folds, "waves."

O. aksuaticus - Serrations at the base of the crown and on the lateral cusps. 

O. auriculatus - Serrations that almost reach the tip (2/3 serrated crown).

*O. poseidoni - First fully serrated tooth.

O. sokolovi - Wider crown, flatter root.

O. angustidens - Wider crown, smaller cusps.

O. chubutensis - Cusps disappearing into crown.

O. megalodon - No cusps. 

 

*Synonymous with auriculatus??? 

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SailingAlongToo

Some info on the general location(s) where they were found and known strata  / geology for the area(s) would definitely be helpful in making IDs. If the geology isn't known for the area(s) in question, given these are stated to have come from VA, general location(s) where found is all many folks on TFF need to help with definitive IDs.  I'm guessing they came from a shoreline of a river / stream, below some cliffs or bluffs in the ENE part of VA.

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