Unusual leg bone ID help

[diginupbones]

Found in North central Nebraska. Miocene. I have a feeling @Harry Pristis and @Shellseeker might be helpful on this one. 

[Shellseeker]

47 minutes ago, diginupbones said:

Found in North central Nebraska. Miocene. I have a feeling @Harry Pristis and @Shellseeker might be helpful on this one. 

See that tiny bone connecting two spots on the larger bone... it is called a "entepicondylar foramen"  You have a humerus.  I found out about the foramen chasing down a rabbit role in this thread!!!  Never was able to identify either bone, which were found at a Miocene site.

 

[Harry Pristis]

1 hour ago, diginupbones said:

Found in North central Nebraska. Miocene. I have a feeling @Harry Pristis and @Shellseeker might be helpful on this one. 
      

 

This is the distal humerus from a large bear-dog, an amphicyonid.  There are a few species to be found in the Miocene of Nebraska.  As Jack suggests, the entepicondylar foramen is an important diagnostic feature.

 

This canal occurs near the distal end of the humeri of many taxa. This is the canal traversed by the median nerve and the brachial artery which is called the entepicondylar foramen (EECF). 

An EECF is found neither on the humeri of perissodactyls (horses, tapirs, et al.) nor on the humeri of artiodactyls (antelopes, camels, et al.), nor is it found in lagomorphs (rabbits and such).

The EECF is absent in hyaenids, bears, and canids (including foxes and chihuahuas).

The EECF is present in pampatheres, didelphids (opossums) and in shrews and moles! (Micro-fossil collectors take note.)

The EECF is present in felids, in viverrids (all Old World), in amphicyonids (bear-dogs), and in mustelids (weasels and skunks) and procyonids (raccoons). 

[Shellseeker]

1 hour ago, Harry Pristis said:

The EECF is present in pampatheres, didelphids (opossums) and in shrews and moles! (Micro-fossil collectors take note.)

Harry,  TWO for one in this Identification !!!

I never identified the humerus in the thread I pointed to above,  but tonight when you answered this one, I focused on the word pampatheres,  did a search for "Megalonyx Jeffersonii Humerus" and his this website:

https://sketchfab.com/3d-models/megalonyx-humerus-vcu-3d-4149-2a198b4f51a44f71a3c5cfad50e65438

and THIS photo.

I do not know if my distal end of a humerus is "jeffersonii",  but I do know that it is Sloth,  which matches other finds in the area.   Thanks for the Identification

 

[diginupbones]

1 hour ago, Harry Pristis said:

This is the distal humerus from a large bear-dog, an amphicyonid.  There are a few species to be found in the Miocene of Nebraska.  As Jack suggests, the entepicondylar foramen is an important diagnostic feature.

Very interesting! This is an exciting find for me. That little extra bone was the one feature that I was counting on making this identifiable. I probably wouldn’t have even posted it if that had not been intact. Thanks guys!