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Range DescriptionThere are two recognized subspecies:
Saguinus fuscicollis melanoleucus occurs along the east (right bank) of the upper Rio JuruÃ¡, south from the mouth of the Rio EirÃº (Hershkovitz 1977). With S. f. acrensis now recognized to be a hybrid form of S. f. melanoleucus x S. f. fuscicollis at the headwaters of the Rio JuruÃ¡ (Peres 1993), the range of S. f. melanoleucus now includes that of acrensis, along the right bank of the upper JuruÃ¡ up to its headwaters, as described by Hershkovitz (1977). No records are available for the Rio TarauacÃ¡, but according to Hershkovitz (1977) specimens collected by A. M. Olalla from Santa Cruz, Rio Eiru, in 1936, were from the right bank of the river, indicating that the distribution extends at least to the left bank of the Rio TarauacÃ¡. No saddleback tamarins have to date been recorded to the east of the Rio TarauacÃ¡ in the state of Acre as far as the upper Rio Purus. Mena et al. (2007) provided the first record of S. f. melanoleucus for Peru (headwaters of the RÃo Breu (right bank affluent of upper JuruÃ¡). However, the specimen actually looks like one of the hybrids (fuscicollis Ã melanoleucus) that were discussed by Peres et al. (1996).
The origin and distribution of the subspecies Saguinus fuscicollis crandalli is not known. Hershkovitz (1977, p.636) proposed that it may occur between the Rios Purus and Madeira, south of the Rio Amazonas/SolimÃµes. The affinity of this tamarin to S. f. melanoleucus and particularly the form described as S. f. acrensis by Hershkovitz (1977) (here regarded as a hybrid form of S. f. fuscicollis and S. f. melanoleucus, see Peres 1993, Peres et al. 1996) in terms of its pelage colour and pattern is the only indication of its distribution, and on this basis, Hershkovitz (1977, p.622) subsequently suggested a more likely locality: the headwaters of the Rio Purus in southern Peru.