DistributionRead full entry
Range DescriptionThe range is reportedly delimited to the north and west by the Rios Mamoré-Madeira and Jiparaná, and to the south by the Serra dos Pacáas Novos, where it may be parapatric with M. melanura, which is “typically found in the savanna-like vegetation, rather than rain forest ecosystems, that predominate in southern Rondônia. Ferrari et al. (1995) failed to find any evidence of the occurrence of marmosets during surveys of the Guajará-Mirim State Park in west-central Rondônia. Likewise no marmosets were recorded at Pimenta Bueno on the upper Rio Jiparaná (Ferrari et al. 1996), although G. R. Monção has recorded this species there (pers. comm. to A. B. Rylands, February 2006). The range of this marmoset, as such, is evidently much smaller than previously thought.
Vivo (1985) argued that the Foz do Rio Castanho specimens, later described as Callithrix argentata marcai by Alperin (1993) were similar, and Vivo (1985) made no mention of the two other localities indicated by Hershkovitz (1977: 214b, mouth of the Rio Jiparaná, upper Rio Madeira; and 214c, Urupá, Rio Jiparaná), but his map would argue that they would also be “C. emiliae”. The discovery of M. nigriceps (Ferrari and Lopes 1992) means that the range of Vivo’s (1985) “C. emiliae” is restricted to the left bank of the Rio Jiparaná.