Baby T. Rex or Nanotyrannus?

[Toast123]

Location: Hell Creek formation, Carter county 

Very small tooth so it was pretty hard to get good and clear photos.

I’ll try to add some better ones later today.

I have two confirmed Nano teeth I used as a comparison, they both look more slender than this one, but I’m not sure.

 

[Tidgy's Dad]

You do not have confirmed Nanotyrannus teeth, the genus is dubius at best. 

Until the genus is officailly accepted, it cannot have confirmed teeth.

 

 

[Toast123]

Just now, Tidgy's Dad said:

You do not have confirmed Nanotyrannus teeth, the genus is dubius at best. 

Until the genus is officailly accepted, it cannot have confirmed teeth.

 

 

Oh okay, thanks for letting me know. What I meant is that they most likely aren’t T. rex 

[Tidgy's Dad]

14 minutes ago, Toast123 said:

Oh okay, thanks for letting me know. What I meant is that they most likely aren’t T. rex 

Different positions in the jaws, species variation, age differenes, other species being present,

[FB003]

'm not quite sure you can determine a difference between the two at that size.  At least on my phone the denticles appear to be chisel shaped indicating a Tyrannosaurid. That size doesn't present alot of opportunity for a confidence factor on looks alone. Here is a guide I use from time to time which indicates what measurements might be helpful in determine a species.  Good luck!

 

 

[Toast123]

27 minutes ago, FB003 said:

'm not quite sure you can determine a difference between the two at that size.  At least on my phone the denticles appear to be chisel shaped indicating a Tyrannosaurid. That size doesn't present alot of opportunity for a confidence factor on looks alone. Here is a guide I use from time to time which indicates what measurements might be helpful in determine a species.  Good luck!

 

 

Thanks I’ll have a look

[TyBoy]

Could be Nanotyrannus but its really to small to be positive best identified as indet. Tyrannosaurid.

[Kikokuryu]

Likely Tyrannosauridae indet., but I will say it does lean a bit towards Tyrannosaurus rex with that blunt tip. When it comes to tiny short crowns, you definitely want teeth that have pristine tips as T. rex has serrations the wrap around the tip that I don't think is seen in morphs labeled as Nanotyrannus.

[ThePhysicist]

Agree, they're both posterior juvenile tyrannosaurids (I consider them T. rex until new evidence suggests otherwise). There is some variability in basal compression. Compare to a couple of mine:

 

 

 

18 minutes ago, Kikokuryu said:

Likely Tyrannosauridae indet., but I will say it does lean a bit towards Tyrannosaurus rex with that blunt tip. When it comes to tiny short crowns, you definitely want teeth that have pristine tips as T. rex has serrations the wrap around the tip that I don't think is seen in morphs labeled as Nanotyrannus.

Counterexample in a nano-morph:

[patelinho7]

Aren't nano teeth characterized by the pinching of the base? This one doesn't seem to have an obvious pinch.

[Toast123]

1 hour ago, Kikokuryu said:

Likely Tyrannosauridae indet., but I will say it does lean a bit towards Tyrannosaurus rex with that blunt tip. When it comes to tiny short crowns, you definitely want teeth that have pristine tips as T. rex has serrations the wrap around the tip that I don't think is seen in morphs labeled as Nanotyrannus.

I’ll have to check under the microscope again but it does look like the serations wrap around the tip

[Toast123]

1 hour ago, ThePhysicist said:

Agree, they're both posterior juvenile tyrannosaurids (I consider them T. rex until new evidence suggests otherwise). There is some variability in basal compression. Compare to a couple of mine:

 

 

 

Counterexample in a nano-morph:

Thanks for sharing those pictures, the shape of my tooth looks pretty snarge similar to those in the picture. Whereas my other tooth labeled as nano looks a lot more slender but I suppose that can depend on other factors too. I think the biggest difference is the base, this one is fatter than the nano teeth I have. It also doesn’t have a pinch