Mittermeier's saki

Photo taken on the 18th June 2010.

I'd say it's a Pithecia irrorata but it's difficult to say from just one picture. Didn't the exhibit have a sign? Anyway, thank you for uploading all these interesting photos.

Thanks, unfortunately I didn't get any decent photos of some of my more exciting species, like Lear's macaws, Sphiggurus porcupines, hoary foxes...
I've attached two more photos of this pair of these sakis. Unfortunately many enclosures didn't have any signs, despite the real gems inside.

Finally settled.
It turns out that this is a male Mittermeier's saki, and this photo was actually used in the description of the species.