Graells's tamarin, ''Leontocebus nigricollis graellsi'', is a subspecies of the black-mantled tamarin from the northwestern

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in southeastern Colombia, eastern

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and northeastern

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. It differs from other black-mantled tamarins in having a dull olive-brown (no reddish-orange) lower back, rump and thighs. Defler, T. (2004). ''Primates of Colombia.'' Conservation International. However, molecular genetic analysis does not support treating Graell's tamarin as a separate species from the black-mantled tamarin.

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Further reading