3 hell creek theropod teeth

[Fossil'n'Roll]

I found these three teeth on a certain auction site (all 5/8" long) listed as raptor teeth (probably just based on size), but clearly the first two are not. They must be either Nanotyrannus or T. rex. The cross section of the first is very rectangular like Nanotyrannus, but also very robust/"fat". I'm leaning toward Nano on this one. The second seems more oval shaped so I'm leaning a little toward T. rex on this one. I'm not really sure on either though. As for the third one, my gut says Nanotyrannus. The anterior and posterior serrations are definitely too similar for Acheroraptor (I have one, very different), but could it possibly be Dakotaraptor? Any help here is appreciated. I'm really not very interested in Nanotyrannus teeth right now but I am very interested in small mislabeled T. rex or Dakotaraptor teeth.

 

tooth #1:

 

tooth #2:

 

tooth #3:

[Micah]

@Troodon @LordTrilobite Y’all take it away

[LordTrilobite]

Though I'd lean towards Nanotyrannus being a separate species, I'm actually still on the fence on this issue. As far as I know T. rex teeth are D shaped in cross section without a pinch. But Troodon is more knowledgeable about Tyrannosaurid teeth.

 

And all the raptor teeth I've come across are very thin laterally. Which would exclude your teeth 1 and 2. Acheroraptor should have longitudinal ridges going up I think. On raptor teeth the serrations on the back of the tooth are generally also much larger than those on the front. Sometimes the front serrations are almost not visible to the naked eye.

[Troodon]

Agree with your assesment definitely all Tyrannosaurid teeth. #3 looks like a classic Nano.  #2 does have the look of a rex and I would lean that way.  #1 Not sure would call it Tyrannosaurid.  I would have to hold that one and really study it.  Nice teeth great pickup.

[Fossil'n'Roll]

So, I received them Friday and finally had time to really look at them today. Teeth #1 and #3 are actually 11/16" not 5/8" . Tooth #1 is definitely slightly pinched in at the base. Tooth #2 is not pinched. On #2, behind where the anterior serrations were, the entire side from the tip to just before the base is concave. Is there a particular position in the jaw where that is normal?

Serration count per mm:

#1: posterior ~3.5, anterior ~4.5

#2: posterior ~3.5

#3: posterior ~4,  anterior ~4

Here are some more pictures.

 

#1

 

#2

 

#3

 

Maybe some of this will help with a more concrete ID on #1 and #2. If not, that's okay.