Small Ungual

[Shellseeker]

Picked this small bone out of my Sieve a week ago. Rolled it around in my hand. Seemed unbroken, so I kept it.

Seems unbroken on all edges; An outside layer over porous bone; Articulation facet on proximal end. 

 

 

 

 

 

Fauna which I find frequently at this location is Giant Armadillo,  Glyptodont, Alligator.  Less frequently is Bear,  Sloth, Dolphin.  I will check out those fauna and others tomorrow,  unless eliminates the check for a fauna because they know the fauna does not match.  Please comment on any additional fauna I should check.

 

Thanks,  Jack

[Balance]

Looks a lot like an Equus proximal sesamoid bone. That last photo is throwing me off though. Best I got  
 

[Shellseeker]

3 hours ago, Balance said:

Looks a lot like an Equus proximal sesamoid bone. That last photo is throwing me off though. Best I got

Thanks Jp

I never considered the Tridactyl horses... Gives me another possibility and thread to follow

 

It was not the ungual of any of the 6 animals I decided to follow.... The closest I got was looking at the distal bones on a dolphin flipper.. 

Great similarity with the bones of Permian amphibian dinosaurs... but maybe not a good ID

 

[Harry Pristis]

Consider sesamoid, though I am reluctant to guess at the animal.  I don't think it's from a horse.  Something mid-size, like a pig.

 

 “In many mammals, such bones include the patella and large sesamoids in the manus and pes.

 

"In ungulates, on the other hand, the only [relatively] large intermembranous element is the patella. The sesamoids in the manus or pes are small nodular ossifications in the digital flexor tendons, both at the metapodial-phalangeal joint and the distal interphalangeal joint. 

 

"Suids have as many as 13 sesamoids in the manus alone." 

[Shellseeker]

1 hour ago, Harry Pristis said:

Consider sesamoid, though I am reluctant to guess at the animal.  I don't think it's from a horse.  Something mid-size, like a pig.

 

 “In many mammals, such bones include the patella and large sesamoids in the manus and pes.

 

"In ungulates, on the other hand, the only [relatively] large intermembranous element is the patella. The sesamoids in the manus or pes are small nodular ossifications in the digital flexor tendons, both at the metapodial-phalangeal joint and the distal interphalangeal joint. 

 

"Suids have as many as 13 sesamoids in the manus alone." 

Thanks for the guidance.  I appreciate your expertise and providing additional possibilities that I would not have thought about. I let you know one way or the other if it pans out.  Jack