T-rex tooth or Nanotyrannus tooth ?

[Jonathan Raymond]

Hello everyone !

 I bought this Tyrannosaur tooth and the seller told me it was either a Tyrannosaurus rex or a Nanotyrannus.

Can you tell me if it's a T-rex or a Nanotyrannus ?

It's a premaxillary tooth.

It comes from Hell Creek formation in South Dakota.

[ziggycardon]

This looks more crocodilian to me than dinosaurian. 
Also are you entirely sure this is from the Hell Creek Formation, preservation reminds me more of triassic finds from the Bull Canyon and Redonda Formations than it does from the Hell Creek.

The experts will soon chime in and might tell you more.

[Troodon]

Looking for serrations on both carinae which you would expect to see if its a Tyrannosaurid, not seeing them.  Seeing possible a partial carina.  The light vertical ridges are also a characteristics you would not see on one.  Preservation is also not typical of HC.  So like ziggycardon said does not look dinosaurian.  Did the seller provide you with any better locality?  Can you go back to him to discuss what you received and get a refund.

BTW the Hell Creek age in your label should be 66 mya, 65 is Paleocene

[pachy-pleuro-whatnot-odon]

I agree, this looks more like a phytosaur tooth than a theropod tooth, such as the below specimen from the Cooper Canyon Formation in Scurry County, Texas. Observe the size, similarities in preservation, ribbing and nature of the carinae.

 

[ziggycardon]

3 minutes ago, pachy-pleuro-whatnot-odon said:

I agree, this looks more like a phytosaur tooth than a theropod tooth, such as the below specimen from the Cooper Canyon Formation in Scurry County, Texas. Observe the size, similarities in preservation, ribbing and nature of the carinae.

 

My thoughts as well, most Phytosaur teeth I see for sale have same preservation as the tooth OP is showing.

[Jonathan Raymond]

Le 02/11/2023 à 06:18, Troodon a dit :

Vous recherchez des dentelures sur les deux carènes que vous attendez à voir si c'est un tyrannosauridé, sans les voir. Voir possible une carène partielle. Les crêtes verticales légères sont également des caractéristiques que vous ne verriez pas sur un. La conservation n'est pas non plus typique de HC. Donc, comme l'a dit Ziggycardon, ça n'a pas l'air dinosaurien. Le vendeur vous at-il fourni une meilleure localité ? Revenez-vous vers lui pour discuter de ce que vous avez reçu et obtenir un remboursement.

BTW l'âge de Hell Creek dans votre étiquette devrait être de 66 mya, 65 est le Paléocène

Le vendeur m'a dit que la dent est de 65 mya et  qu'il  n'accepte pas le retour.

[Troodon]

It may be 66 mya but the ID is incorrect and it does not look like it's from the Hell Creek Fm.

[Jonathan Raymond]

3 minutes ago, Troodon said:

Il s'agit peut-être de 66 millions d'années, mais l'ID est incorrect et il ne semble pas provenir de Hell Creek Fm.

Thank you. I will try to get my money back. It's a fraud.

[Troodon]

Good luck

[hadrosauridae]

Just as a PS, this is what a T.rex pre-maxillary tooth looks like....

 

 

[jpc]

I also agree that the preservation is not at all what one would expect in the HCF.