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Is this a juvenile T.rex tooth or a nanotyrannus


Fossil Maniac

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Hello! I saw this 1.06 inch Tyrannosaur tooth from the hell creek formation in montana labled as a juvenile T.rex tooth. (he has other teeth labled as nano teeth so it wasn't his personal preference) I'm not good at telling them apart so that's why i brought it here! So is it a juvie T.rex or a nanotyrannus?

Thank you!

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My vote is "neither". The profile looks too tall and curved for rex, base is almost square which is completely different than the "squished oval" of the nano.

"There is no shortage of fossils. There is only a shortage of paleontologists to study them." - Larry Martin

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Do you have a locality where its from?  Interesting tooth.  Has to be a Tyrannosaurid not much else is that size.

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40 minutes ago, Fossil Maniac said:

Hello! I saw this 1.06 inch Tyrannosaur tooth from the hell creek formation in montana labled as a juvenile T.rex tooth. (he has other teeth labled as nano teeth so it wasn't his personal preference) I'm not good at telling them apart so that's why i brought it here! So is it a juvie T.rex or a nanotyrannus?

Thank you!

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Hi,

 

I'm the seller listing the tooth. Also yeah, I spent a lot of time looking at that one before making my decision for listing. The base was actually more tear shape however the shape looks different because a piece near the base is missing in the bottom right corner of the last photo.

 

Also it's from Powder River County if that helps Troodon. Very interested to hear your opinion.

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7 minutes ago, jikohr said:

Hi,

 

I'm the seller listing the tooth. Also yeah, I spent a lot of time looking at that one before making my decision for listing. The base was actually more tear shape however the shape looks different because a piece near the base is missing in the bottom right corner of the last photo.

 

Also it's from Powder River County if that helps Troodon. Very interested to hear your opinion.

Wow! thank you!

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Only way to ID teeth is to have a complete provenance, thanks

Certainly not a slam dunk.  The base points to a Tyrannosaurid not much else in the HC. 

Here is a Trex jaw with an anterior tooth thats pretty slim.  So its possible its one, just a bit smaller, from a younger animal.  Very nice tooth just a teaser to make a definitive call.

 

Screenshot_20220629-180532_Drive.jpg.d8455d0ef01126b7c016a77300ded3ba.jpg

 

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37 minutes ago, hadrosauridae said:

My vote is "neither". The profile looks too tall and curved for rex, base is almost square which is completely different than the "squished oval" of the nano.

Then what is it? A completley new genus of tyrannosaurid?

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Just now, Troodon said:

Certainly not a slam dunk.  The base points to a Tyrannosaurid not much else in the HC. 

Here is a Trex jaw with an anterior tooth thats pretty slim.  So its possible its one, just a bit smaller, from a younger animal.  Very nice tooth just a teaser to make a definitive call.

 

Screenshot_20220629-180532_Drive.jpg.d8455d0ef01126b7c016a77300ded3ba.jpg

 

 

1 minute ago, Fossil Maniac said:

Then what is it? A completley new genus of tyrannosaurid?

 

If I understand correctly, it means there isn't enough data to say for certain if it's Nano or Juvie Rex.

 

I'll differ to Troodon's expertise and change it accordingly.

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3 minutes ago, Fossil Maniac said:

Then what is it? A completley new genus of tyrannosaurid?

No. Just an odd shaped root due to the picture and how it broke away.

*Frank*

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50 minutes ago, Troodon said:

I would try to get one more opinion that from P Larsen

how would someone even get into contact with pete larson?

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2 hours ago, Troodon said:

Pm sent

How?

EDIT: nevermind

Edited by Fossil Maniac
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Can you keep us updated what mr. Larson said it was?

To me it definitely not looks like a Rex tooth. So slender for it 

Thank you

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1 hour ago, Phos_01 said:

Can you keep us updated what mr. Larson said it was?

To me it definitely not looks like a Rex tooth. So slender for it 

Thank you

He Hasn't responded yet.

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On 6/30/2022 at 7:01 AM, Phos_01 said:

Can you keep us updated what mr. Larson said it was?

To me it definitely not looks like a Rex tooth. So slender for it 

Thank you

Yes you where right, Mr. Larson said it's a Dakotaraptor.

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Wow, cool but shocked since we have no morphology like this described as a Dromaeosaurid in the HC  and know little of what DK's looks like.   Like to understand the density of the serrations.

@jikohrcan you do a serration count would like to see what it is.

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5 minutes ago, Fossil Maniac said:

Yes you where right, Mr. Larson said it's a Dakotaraptor.

Wait, Dakotaraptor?!

I mean don't get me wrong, I'm THRILLED but, doesn't the mesial carinae curving off to the side rule him out?

Hang on guys, I'm going to get some close ups and density of the serrations.

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We have no knowledge of what the dentition of Dakotaraptor looks like.   We just have a few isolated teeth.  Acheroraptor probably looks more like the skull of Saurornitholestes

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3 hours ago, jikohr said:

Wait, Dakotaraptor?!

I mean don't get me wrong, I'm THRILLED but, doesn't the mesial carinae curving off to the side rule him out?

Hang on guys, I'm going to get some close ups and density of the serrations.

Yup

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4 minutes ago, jikohr said:

Wait, Dakotaraptor?!

I mean don't get me wrong, I'm THRILLED but, doesn't the mesial carinae curving off to the side rule him out?

Hang on guys, I'm going to get some close ups and density of the serrations.

Does that make it rarer then a T.Rex tooth

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17 hours ago, Fossil Maniac said:

Does that make it rarer then a T.Rex tooth

It might , this is also a nice size

However the Tyrranosaur Rex is the most sought for Dinosaur ever. And many tooth get sold with wrong info

 

This tooth is very nice, congrats! Grating it graded by Larson is an honor. 

Edited by Phos_01
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distal carinae serration density is 2.91 per mm taken over 3 mm

mesial carinae serration density is 4 per mm taken over 3 mm

 

Final thoughts gentleman?

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