Small jaw segment with teeth (Ischyromys?) White River Formation

[Opabinia Blues]

Hello,

 

this is a small jaw segment from the White River Formation (Poleslide Member of the Brule) from Weld County, CO. This is one of a few jaw segments I cannot white identify. It does not look like the Leptomeryx jaw segments that I have collected (and indeed is even too small to fit that genus), and the shape of the teeth to me do not look like they belong to an Artiodactyl of any kind, so my best guess based on picture browsing is Ischyromys but I could be very very wrong here so I appreciate any help.

 

Thanks!

[siteseer]

1 hour ago, OpabiniaBoogaloo said:

Hello,

 

this is a small jaw segment from the White River Formation (Poleslide Member of the Brule) from Weld County, CO. This is one of a few jaw segments I cannot white identify. It does not look like the Leptomeryx jaw segments that I have collected (and indeed is even too small to fit that genus), and the shape of the teeth to me do not look like they belong to an Artiodactyl of any kind, so my best guess based on picture browsing is Ischyromys but I could be very very wrong here so I appreciate any help.

 

Thanks!

 

In order to ID mammal teeth, we need an occlusal view - a shot straight down at the biting surface.

 

Jess

 

 

 

 

[Opabinia Blues]

5 hours ago, siteseer said:

 

In order to ID mammal teeth, we need an occlusal view - a shot straight down at the biting surface.

 

Jess

 

 

 

 

[jpc]

and I hate to have to say this, but it needs to be in focus.

The double lobed shape I can see suggests not a rodent.  Have you looked into Hypisodus, it is a smaller artiodactyl than Leptomeryx.

 

[Opabinia Blues]

30 minutes ago, jpc said:

and I hate to have to say this, but it needs to be in focus.

The double lobed shape I can see suggests not a rodent.  Have you looked into Hypisodus, it is a smaller artiodactyl than Leptomeryx.

 

That’s as in focus as it’s going to get I’m afraid, phone cameras and small objects do not mix. Thank you for suggesting smaller Artiodactyls, because I’m fairly sure this segment isn’t Leptomeryx. I will look into that.

[siteseer]

It looks like it was in the direct sun too long.  Maybe Larry can offer an opinion.  @fossillarry

[fossillarry]

It's a highly worn,sun bleached Leptomeryx lower jaw fragment with p4,m1 and half of m2. Hypertragulus has a short pointed p4 and is smaller. Hypisodus has a very different tooth pattern and is way smaller then this specimen.