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 SÃ£o Pedro in Brazil, in an area otherwise occupied by S. l. labiatus. EncarnaciÃ³n 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 RÃo 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 RÃo 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 PauinÃ and the Rios Purus and ItuxÃ (Hershkovitz 1979).
Saguinus imperator subgrisescens Bolivia, Brazil, Peru
South-western Amazon, in Brazil along the east (right bank) of the upper Rio JuruÃ¡ east to the Rios TarauacÃ¡ and JuruparÃ, to the Brazil/Peruvian frontier. Into Peru, west from the JuruÃ¡ headwaters, it occurs as far as the foothills of the Andes in the upper RÃo Ucayali, east of the mouth of the RÃo Apurimac and to the south of the RÃos Urubamba and Inuya. Its range extends east into Bolivia on both sides of the RÃo Madre de Dios (Izawa 1979). It is probably limited to the south of the RÃo TahuamanÃº. Izawa and Bejarano (1981) reported it only from the RÃo Muyumanu basin, a south bank tributary of the RÃo TahuamanÃº. Castro et al. (1990) found that it was absent from the area between IÃ±apari (just south of the RÃo Acre) and Iberia (north bank of the RÃo TahuamanÃº) in Peru where S. l. labiatus occurs. Aquino and EncarnaciÃ³n (1994) extended the range indicated by Hershkovitz (1979) east to the basin of the RÃo Tambopata to the Bolivian border, indicating that the RÃo Madidi, an eastern tributary of the RÃo Beni in Bolivia, may mark the southern limit to this species.