Hell Creek & Aguja Richardoestesia gilmorei?

[Kikokuryu]

I was looking at some of my small theropod teeth, but I was not 100% sure what the best ID for these two teeth were. Any input or help would be appreciated.

 

These were sold as Nanotyrannus, but very small chance of dromaeosaurid and Aguja dromaeosaurid respectively, but I think they might be Richardoestesia cf. gilmorei. The cross-section of the Hell Creek tooth I think rules out Dakotaraptor, or at the very least, does not match the known morphology.

 

Edit: Oops, I used the really funky side of the ruler I'm using. I was going to use the millimeter side, but ending up using a side that measures 20mm per. The measurements are accurate though as I used calipers for that.

 

 

Hell Creek Formation; Garfield County, Montana

CBL: 6mm

CBW: 2.4mm

Mesial Density: 8-9/mm [Towards end of carinae]

Distal Density: 11/2mm (5.5/mm)

 

CH is a bit difficult since the tooth has heavy feeding wear, but it is 8.3mm tall, but could be significantly higher. The mesial carinae does not appear to extend to the base.

 

 

 

Aguja Formation; Brewster County, Texas

CH 6.4mm
CBL 3.7mm
CBW 1.4mm

Mesial Density: Possibly worn down, or none

Distal Density: 16/2mm (8/mm)

 

Edited May 22, 2023 by Kikokuryu

[Troodon]

First HC tooth looks like Tyrannosaurid. 

The second tooth is more problematic.  I think all you can say is that it's Indeterminate.  I don't think its a Dromaeosaurid and that mesial twist and robustness leans more toward a Tyrannosaurid.  I believe I see remnants of mesial serrations.

 

[Kikokuryu]

@Troodon Thank you. I assume Tyrannosauridae indet. for the HC.

 

I figured it might end up being indet., but that's okay. Regarding serrations, I was sure it was just the lighting that gives it that look, but I will probably double check once I get back home.