The black-mantled tamarin, Leontocebus nigricollis, is a species of saddle-back tamarin from the northwestern Amazon in far western Brazil, southeastern Colombia, north-eastern Peru and eastern Ecuador.

There are 3 subspecies: Spix's black mantle tamarin, Leontocebus nigricollis nigricollis Graells's tamarin or Graells' black-mantle tamarin, Leontocebus nigricollis graellsi Hernandez-Camacho's black-mantle tamarin, Leontocebus nigricollis hernandezi

Graells's tamarin was previously considered to be a separate species.Rylands, Mittermeier, Coimbra-Filho, Heymann, de la Torre, Silva Jr., Kierulff, Noronha and Röhe (2008). Marmosets and Tamarins: Pocket Identification Guide. Conservation International. Defler, T. (2004). Primates of Colombia. Conservation International.

Predation Predators of black-mantled tamarins include barred forest falcons.

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