JRF Saurornitholestes langstoni tooth?

[andy_mnemonic]

I recently picked up this tooth labeled as dromaeosaur from the Judith River Fm in Hill Co, MT and I think it may be Saurornitholestes langstoni.  Can anyone confirm the id for me?

 

Thanks!

 

 

[Runner64]

I am thinking a Troodontid tooth just because those distal serrations are so large.

[Pterygotus]

I agree, I think troodonid as well.

[Troodon]

Can you take a photo of the mesial edge I need to have a better image of the denticles.  Also one of the base, thanks.

[andy_mnemonic]

Here are the mesial and base views.  Tricky getting decent photos of the little biter!  It looks like the mesial denticles are worn off towards the tip.

 

[dinosaur man]

I would also say it’s a Troodontid, considering the size and shape of the distal denticles.

[andy_mnemonic]

My first thought when I saw it was that it could be a Troodontid but with my limited experience figured it was probably a more common Saurornitholestes.  Either way it's a neat little tooth.

[Troodon]

First Saurornitholestes is not described from the JRF but cf ,similar,  specimens are common.   This tooth is not compressed enough to be one as seen in your base cross-section, should be flatish and rectangular and serration density to large. 

 

The other possibility offered is Troodontid and but there are several characteristics that argue against it.  The CHR, crown height ratio appears to high which means the tooth is too high against its width.    Other characteristics that don't fit are the shape of the shape of the cross-section, not rectangular and shape direction of the denticles. 

The distal serrations circled should not be perpendicular to the crown but pointing toward the tip 

 

The mesial ones also don't look right from the ones Ive seen but the entire carina is pretty worn

 

Not sure what you have might be a indet Dromaeosaurid 

[dinosaur man]

15 minutes ago, Troodon said:

First Saurornitholestes is not described from the JRF but cf ,similar,  specimens are common.   This tooth is not compressed enough to be one as seen in your base cross-section, should be flatish and rectangular and serration density to large. 

 

The other possibility offered is Troodontid and but there are several characteristics that argue against it.  The CHR, crown height ratio appears to high which means the tooth is too high against its width.    Other characteristics that don't fit are the shape of the shape of the cross-section and shape direction of the denticles. 

The distal serrations circled should not be perpendicular to the crown but pointing toward the tip 

 

The mesial ones also don't look right from the ones Ive seen but the entire carina is pretty worn

 

Not sure what you have might be a indet Dromaeosaurid 

There might be a new undescribed Dromaeosaurid from the JRF with these characteristics, but nothing is known about this that’s if there is one.

[andy_mnemonic]

Looks like this one will stay as indet Dromaeosaurid for now.

 

@Troodon Your post on Judith River theropod teeth led me to believe Saurornitholestes was present in the JRF. 

 

 

Thanks again to everyone for your inputs!

 

[Troodon]

I need to update that topic its pretty outdated 

[andy_mnemonic]

4 hours ago, Troodon said:

I need to update that topic its pretty outdated 

 

Gotcha, thanks for taking a look at my tooth and for making all those great dino topics!