DistributionRead full entry
Range DescriptionThe range is reportedly delimited to the north and west by the Rios Mamor-Madeira and Jiparan, and to the south by the Serra dos Pacas 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 Rondnia. Ferrari et al. (1995) failed to find any evidence of the occurrence of marmosets during surveys of the Guajar-Mirim State Park in west-central Rondnia. Likewise no marmosets were recorded at Pimenta Bueno on the upper Rio Jiparan (Ferrari et al. 1996), although G. R. Mono 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 Jiparan, upper Rio Madeira; and 214c, Urup, Rio Jiparan), 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 Vivos (1985) C. emiliae is restricted to the left bank of the Rio Jiparan.