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Callithrix emiliae and Saguinus fuscicollis weddelli (Callitrichidae), Callicebus moloch and Pithecia hirsuta (Cebidae) were collected in the state of Rondônia, Brasil, as pari of the Project "Polonoroeste". Taxonomic and disíributional notes are provided for all species but S. fuscicollis, whose taxonomy is not commented. The taxonomic status of Callicebus geoffroyi Miranda-Ribeiro is assessed.
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Mário de Vivo (1985) studied this question.
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