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deira basin, State of Rondonia, located in the Southwest ern Amazon Biome, Brazil . This includes the first registered sighting of Cebuella pygmaea niveiventris within the State of Rondonia. We adopt the taxonomic guidelines of Lon nberg (1940) and consider the Cebuella pygmaea specimen collected from Lago Ipixuna (on the southern banks of the Rio Solimoes) with a white chest, belly, inner surface of forelegs and hindlegs, as a subspecies ( C. p. niveiventris). Hershkovitz (1977), on the other hand, argues that the color of the underparts in this specimen is an individual characteristic and varies locally in the C. pygmaea popula tion, and so does not justify the status of subspecies. Cebuella pygmaea niveiventris was previously thought to occur in the following locations: in Eastern Peru south of the Rio Maranon and east of the Rio Huallaga, and in the Brazilian state of Amazonas, south of the Rio Solimoes and west of the Rio Purus. Its geographical distribution was later found to include the interfluvium Purus-Madeira to the southern limits of the Rio Ipixuna (or Paranapixuna) by Roosmalen and Roosmalen (1997). The presence of C. p. niveiventris in northern Bolivia reported by Heltne et al. (1976), Izawa (1979), Izawa and Bejarano (1981) and Brown and Rumiz (1986) suggests its occurrence in the upper Rio Madeira basin, as well as the eastern part of the State of Acre including the upper reaches of the Rio Abuna, a tributary of the Rio Madeira, as argued by Rylands et al. (1993). Ferrari (1993, 1996) also suggested that it was likely to occur along the upper reaches of the Rio Madeira basin, as local residents had reported its presence near to the Serra dos Tres Irmaos Ecological Station in northwest ern Rondonia. In addition, according to Messias (2002, 2004), a total of 18 out of 66 interviewees living between the Santo Antonio rapids and the convergence of the Rio Abuna with the Rio Madeira confirmed the presence of Cebuella pygmaea niveiventris when shown a selection of photos of various neotropical mammal species.

neotropical primates

Southern extension of the geographical range of the pygmy marmoset &lt;i&gt;Cebuella pygmaea niveiventris&lt;/i&gt; (Lönnberg, 1940) in the southwestern Amazon basin, state of Rondônia, Brazil