Subspecies and Distribution. S. n. mgricollis Spix, 1823 — Brazilian Amazon, N Peru, and possibly SE Colombia, between the Rio Ica—Putumayo and the rios Solimoes-Amazonas and Napo, W as far the seasonally flooded forest varzea along the Tamboryacu. S. n. graellsiJiménez de la Espada, 1870 — S Colombia, NE Ecuador, and N Peru, S of the upper Rio Caqueta (W from the mouth of the Rio Yari) in Colombia, S to both sides of the upper Putumayo as far as the N (left) bank of the Rio Napo, extending E between the Napo and Putumayo as far as the seasonally flooded forest along the Tamboryacu. S. mn. hernandezi Hershkovitz, 1982 — S Colombia, Meta Department, between the rios Caqueta, Caguan, and Orteguaza and the base of the Cordillera Oriental to the Rio Guayabero.

Published as part of Russell A. Mittermeier, Anthony B. Rylands & Don E. Wilson, 2013, Callitrichiade, pp. 262-346 in Handbook of the Mammals of the World – Volume 3 Primates, Barcelona :Lynx Edicions on page 323, DOI: 10.5281/zenodo.5730714