Dakotaraptor premax/anterior?

[Dino Dad 81]

This has the size and J-shape cross section of a dromie premax. It also has the protruding mesial carina that you can see from a distal view. What do you think?

• Hell creek formation, Carter co, Montana
• CH: 15.6mm
• CBL: 6.7mm
• CBW: 4.7mm
• Mesial serration density: 6.5/mm
• Distal serration density: 3.5/mm

 

 

 

 

 

 

 

 

 

 

 

Edited September 30, 2022 by Dino Dad 81

[Dino Dad 81]

 

 

[Troodon]

Are your posted densities reversed?

The characteristics are very different than those described on the holotype of DR.   So there is no way it can be assigned to one.   I think it's too recurved to be an premax so more of an anterior tooth.  The mesial twist and denticle shape point to tyrannosaurid but it's a tiny tooth and density points to Dromaeosaurid.   So like I've said many times before until we understand what these dentitions look like it's indeterminate theropod. 

[Dino Dad 81]

Starting a new topic similar tooth that may better fit your description.

[Dino Dad 81]

1 hour ago, Troodon said:

Are your posted densities reversed?

The characteristics are very different than those described on the holotype of DR.   So there is no way it can be assigned to one.   I think it's too recurved to be an premax so more of an anterior tooth.  The mesial twist and denticle shape point to tyrannosaurid but it's a tiny tooth and density points to Dromaeosaurid.   So like I've said many times before until we understand what these dentitions look like it's indeterminate theropod. 

 

Yes, my densities were reversed.

 

Does the image below look less tyrannosaurid to you? The darker lower denticles in particular are less worn and have very cylindrical shapes with rounded tip.

 

 

[Troodon]

These look Tyrannosaurid, not worn, but you can find characteristics of both on this tooth.  Its uncertainty is why I said indeterminate

[Dino Dad 81]

The denticles actually look extremely similar to this Dromaeosaurus premax posted in the collection of JoeS. Maybe it's fair to call this tooth Dromaeosaurid indet?

[JoeS]

Interesting indet. tooth!
Curious to know if Tyrannosaurids can show a mesial carina that protrudes/folds like this one? @Troodon
Only recently learned that Nanotyrannus teeth can bear a Y-shaped mesial carina, so I would not be surprised.

[Troodon]

2 hours ago, JoeS said:

Interesting indet. tooth!
Curious to know if Tyrannosaurids can show a mesial carina that protrudes/folds like this one? @Troodon
Only recently learned that Nanotyrannus teeth can bear a Y-shaped mesial carina, so I would not be surprised.

 

No idea and not typical, nor have seen it or have anything published on teeth with these characteristics, why I said it indeterminate.   

 

The morphology of Dromaeosaurus teeth appears to be different than most other Dromaeosaurids including a DSDI around or less than 1.  Its possible that something similar exists on other Dromaeosaurids just dont know at this point. 

 

What I have seen is lots of variability within Tyrannosaurid  teeth so is this an aberrant juvie tooth or indicative of a different species ???

 

Check out the denticles on this big T rex tooth