Intraspecific chromosome variation inCebus apella(cebidae, platyrrhini): The chromosomes of the yellow breasted capuchinCebus apella xanthosternoswied, 1820

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Abstract
Chromosome studies in six wild‐caught specimens ofCebus apella xanthosternosshowed a distinctive chromosome pair number 11 that made it possible to distinguish this subspecies from otherCebus apella. The characteristic chromosome pair had intercalar heterochromatin unlike the “standard” chromosome type ofCebus apellaand other species of the same genus, in which this chromosome pair shows a large, terminal, heterochromatic block. A comparison at the chromosomal level between differentCebus apellapopulations suggests that chromosome 11 inCebus apella xanthosternosis a derived chromosome that has probably become fixed in this subspecies, either by selection or by drift in a small isolated population.