Zinner Dietmar, Arnold Michael L, Roos Christian
Cognitive Ethology, Deutsches Primatenzentrum, Göttingen, Germany.
PLoS One. 2009;4(3):e4859. doi: 10.1371/journal.pone.0004859. Epub 2009 Mar 19.
In 2005, a new primate species from Tanzania, the kipunji, was described and recognized as a member of the mangabey genus Lophocebus. However, molecular investigations based upon a number of papionins, including a limited sample of baboons of mainly unknown geographic origin, identified the kipunji as a sister taxon to Papio and not as a member of Lophocebus. Accordingly, the kipunji was separated into its own monotypic genus, Rungwecebus.
METHODOLOGY/PRINCIPAL FINDINGS: We compare available mitochondrial and nuclear sequence data from the voucher specimen of Rungwecebus to other papionin lineages, including a set of geographically proximal (parapatric) baboon samples. Based on mitochondrial sequence data the kipunji clusters with baboon lineages that lie nearest to it geographically, i.e. populations of yellow and chacma baboons from south-eastern Africa, and thus does not represent a sister taxon to Papio. Nuclear data support a Papio+Rungwecebus clade, but it remains questionable whether Rungwecebus represents a sister taxon to Papio, or whether it is nested within the genus as depicted by the mitochondrial phylogeny.
CONCLUSIONS/SIGNIFICANCE: Our study clearly supports a close relationship between Rungwecebus and Papio and might indicate that the kipunji is congeneric with baboon species. However, due to its morphological and ecological uniqueness Rungwecebus more likely represents a sister lineage to Papio and experienced later introgressive hybridization. Presumably, male (proto-)kipunjis reproduced with sympatric female baboons. Subsequent backcrossing of the hybrids with kipunjis would have resulted in a population with a nuclear kipunji genome, but which retained the yellow/chacma baboon mitochondrial genome. Since only one kipunji specimen was studied, it remains unclear whether all members of the new genus have been impacted by intergeneric introgression or rather only some populations. Further studies with additional Rungwecebus samples are necessary to elucidate the complete evolutionary history of this newly-described primate genus.
2005年，一种来自坦桑尼亚的新灵长类物种——基普猿猴被描述并认定为白睑猴属洛菲猴的成员。然而，基于一些狒狒科动物（包括主要地理来源不明的有限数量狒狒样本）的分子研究，将基普猿猴鉴定为狒狒属的姐妹分类群，而非洛菲猴属的成员。因此，基普猿猴被归入其自己的单型属——伦圭卷尾猴属。
方法/主要发现：我们将伦圭卷尾猴凭证标本的现有线粒体和核序列数据与其他狒狒科谱系进行比较，包括一组地理上相邻（同域分布）的狒狒样本。基于线粒体序列数据，基普猿猴与地理上最接近它的狒狒谱系聚类，即来自非洲东南部的黄狒狒和东非狒狒种群，因此它并不代表狒狒属的姐妹分类群。核数据支持狒狒属+伦圭卷尾猴属的进化枝，但伦圭卷尾猴属是否代表狒狒属的姐妹分类群，或者它是否如线粒体系统发育所描绘的那样嵌套在该属内，仍然存在疑问。
结论/意义：我们的研究明确支持伦圭卷尾猴属与狒狒属之间存在密切关系，这可能表明基普猿猴与狒狒物种同属。然而，由于其形态和生态的独特性，伦圭卷尾猴属更有可能代表狒狒属的姐妹谱系，并经历了后来的渐渗杂交。据推测，雄性（原始）基普猿猴与同域分布的雌性狒狒繁殖。杂种与基普猿猴随后的回交将产生一个具有基普猿猴核基因组，但保留黄狒狒/东非狒狒线粒体基因组的种群。由于仅研究了一个基普猿猴标本，尚不清楚新属的所有成员是否都受到属间渐渗的影响，或者只是部分种群受到影响。需要对更多的伦圭卷尾猴样本进行进一步研究，以阐明这个新描述的灵长类属的完整进化历史。
Zotero 插件
