Two new specimens of Calicebus torquatus confirm the previously reported unusually low diploid number of 2n = 20. Banding studies and radioautography identify the X chromosome and compare the karyotype with that of Callicebus moloch cupreus. The latter species has considerably less C-banded heterochromatin. A comparison of Giemsa bands establishes only few comparable chromosome segments.

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http://dx.doi.org/10.1159/000155705DOI Listing

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Two new specimens of Calicebus torquatus confirm the previously reported unusually low diploid number of 2n = 20. Banding studies and radioautography identify the X chromosome and compare the karyotype with that of Callicebus moloch cupreus. The latter species has considerably less C-banded heterochromatin.

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