Toppin’s titi monkey, Callicebus toppini

Callicebus toppini is one of the many new primate species described by Oldfield Thomas, zoologist in the Natural History Museum of London, from a specimen collected by Captain Toppin at the Río Tahuamanu, S.E. Peru, near the Bolivian Boundary.
He described the species being “allied to and of the same grizzled brown colour as C. cupreus. Crown-hairs similarly tipped with buffy, but along the front edge of the hairy part of the forehead the hairs are black, thus forming an indistinct blackish frontal band. Belly and terminal part of limbs red, as in cupreus, but on the hind legs the red is rather more extended, coming up to cover the knee. Hairs on ears dark reddish brown, tail hairs mixed grey and blackish, as in cupreus, but those on the proximal two-thirds are tipped with black, not with white or buffy as in the other species of this group. From all the members of the group with reddish ears this species may be distinguished by the dark tips to its caudal hairs”.

For many years C. toppini was considered to be a synonym of C. cupreus or C. brunneus, until it was re-instated in 2015 (Vermeer and Tello-Alvarado, 2015).

In 1952 Vieira described Callicebus cupreus acreanus from Iquiri, Acre. This is probably a junior synonym of Callicebus toppini.

The range of the  Toppin’s titi monkey extends from central Peru to western Brazil and northern Peru.