DistributionRead full entry
Range DescriptionThere are two recognized subspecies:
Saguinus imperator imperator (Brazil, Peru)
South-western Amazon, east of the upper Rio Purus, between the Purus and the Rio Acre (Hershkovitz, 1979). Izawa and Bejarano (1981) did not record S. i. imperator for Bolivia, but reported an isolated population on the left bank of the Rio Acre, in the basin of the Rio São Pedro in Brazil, in an area otherwise occupied by S. l. labiatus. Encarnación and Castro (1990) found populations of S. i. imperator (but not S. l. labiatus) on the right and left banks of the Rio Acre near the Quebrada Río Branco, approximately 20 km west of Inapari, close to the region indicated by Izawa and Bejarano (1981). The population on the south bank of the Río Acre is evidently highly restricted, the subspecies not having been found anywhere else further south in Peru despite a number of surveys (Castro et al. 1990). It is not known how far it extends into Peru along the Rio Acre, nor whether it occurs between the Rio Purus and Pauiní and the Rios Purus and Ituxí (Hershkovitz 1979).
Saguinus imperator subgrisescens Bolivia, Brazil, Peru
South-western Amazon, in Brazil along the east (right bank) of the upper Rio Juruá east to the Rios Tarauacá and Juruparí, to the Brazil/Peruvian frontier. Into Peru, west from the Juruá headwaters, it occurs as far as the foothills of the Andes in the upper Río Ucayali, east of the mouth of the Río Apurimac and to the south of the Ríos Urubamba and Inuya. Its range extends east into Bolivia on both sides of the Río Madre de Dios (Izawa 1979). It is probably limited to the south of the Río Tahuamanú. Izawa and Bejarano (1981) reported it only from the Río Muyumanu basin, a south bank tributary of the Río Tahuamanú. Castro et al. (1990) found that it was absent from the area between Iñapari (just south of the Río Acre) and Iberia (north bank of the Río Tahuamanú) in Peru where S. l. labiatus occurs. Aquino and Encarnación (1994) extended the range indicated by Hershkovitz (1979) east to the basin of the Río Tambopata to the Bolivian border, indicating that the Río Madidi, an eastern tributary of the Río Beni in Bolivia, may mark the southern limit to this species.