Lesson's saddle-back tamarin (''Leontocebus fuscus'') is a species of

saddle-back tamarin The saddle-back tamarins are squirrel-sized New World monkeys from the family Callitrichidae in the genus or subgenus ''Leontocebus''. They were split from the tamarin genus ''Saguinus'' based on genetic data and on the fact that saddle-back ...

, a type of small monkey from South America. Lesson's saddle-back tamarin was formerly considered to be a subspecies of the brown-mantled tamarin, ''L. fuscicollis''. Genetic analysis showed it to be more closely related to the black-mantled tamarin than to the brown-mantled tamarin. Its type locality is in Colombia, in Plaines de Mocoa, Putumayo, between the Rio Putumayo and Rio Caqueta. It also lives in Brazil. Lesson's saddle-back tamarin has a head and body length of between and . Males have tails between and long, and females have tales between and long. It weighs between and . It sometimes associates with

Goeldi's marmoset The Goeldi's marmoset or Goeldi's monkey (''Callimico goeldii'') is a small, South American New World monkey that lives in the upper Amazon basin region of Bolivia, Brazil, Colombia, and Peru. It is the only species classified in the genus ''Call ...

. The IUCN rates it as

least concern A least-concern species is a species that has been categorized by the International Union for Conservation of Nature (IUCN) as evaluated as not being a focus of species conservation because the specific species is still plentiful in the wild. T ...

from a conservation standpoint.

References

{{newworld-monkey-stub Leontocebus Taxa named by René Lesson Mammals described in 1840