Is this a Two Medicine juvenile tyrannosaurid or Richardoestesia tooth?

[-Andy-]

Hello, this tooth has baffled me for years. I can't tell if it is a juvenile tyrannosaurid dentary tooth or a cf. Richardoestesia gilmorei tooth

 

Its locality info is Montana, Two Medicine Formation

 

The tooth has a serration density of 19/5mm on the distal mid-line. Unfortunately the mesial carina is worn down so that crucial data is missing

 

The CH is 11.5 mm, CBW is 7 mm and CBL is 4.5 mm

 

As far as I am aware, juvenile tyrannosaurid (with the exception of T. rex) have slender teeth while as this tooth is somewhat robust. Meanwhile, Richardoestesia gilmorei is somewhat of a wastebasket ID for many teeth(likely unrelated species), so this teeth should fall into the range of size and morphology for one

 

May I have your thoughts on this tooth?

 

 

Edited October 14, 2021 by -Andy-

[Troodon]

Hi Andy

I'm inclined to call this a dentary tooth of a juvie Tyrannosaurid.   If I look at what Currie describes in Dinosaur Systematics,  R. gilmorei teeth have minute denticles in the order of 6/mm and most important are very compressed.   Both these characteristics do not match your tooth.  It also looks too robust to be one.   

[-Andy-]

9 hours ago, Troodon said:

Hi Andy

I'm inclined to call this a dentary tooth of a juvie Tyrannosaurid.   If I look at what Currie describes in Dinosaur Systematics,  R. gilmorei teeth have minute denticles in the order of 6/mm and most important are very compressed.   Both these characteristics do not match your tooth.  It also looks too robust to be one.   

 

Thank you. Henry Mendoza agrees. He said it's a juvenile posterior tyrannosaur tooth.