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Phylogeny and chronology of the major lineages of New World hystricognath rodents: insights on the biogeography of the Eocene/Oligocene arrival of mammals in South America

机译:新大陆下颚啮齿动物主要谱系的系统发生学和年代学:哺乳动物始新世/渐新世到达的生物地理学见解

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摘要

BackgroundThe hystricognath rodents of the New World, the Caviomorpha, are a diverse lineage with a long evolutionary history, and their representation in South American fossil record begins with their occurrence in Eocene deposits from Peru. Debates regarding the origin and diversification of this group represent longstanding issues in mammalian evolution because early hystricognaths, as well as Platyrrhini primates, appeared when South American was an isolated landmass, which raised the possibility of a synchronous arrival of these mammalian groups. Thus, an immediate biogeographic problem is posed by the study of caviomorph origins. This problem has motivated the analysis of hystricognath evolution with molecular dating techniques that relied essentially on nuclear data. However, questions remain about the phylogeny and chronology of the major caviomorph lineages. To enhance the understanding of the evolution of the Hystricognathi in the New World, we sequenced new mitochondrial genomes of caviomorphs and performed a combined analysis with nuclear genes.
机译:背景新大陆的豚鼠啮齿类动物Caviomorpha是具有悠久进化史的多样谱系,它们在南美化石记录中的代表性始于它们在秘鲁始新世的沉积中。关于这一群体的起源和多样化的争论代表了哺乳动物进化中的长期问题,因为早期南美白was和灵芝灵长类动物出现在南美是一个孤立的大陆时,这增加了这些哺乳动物群体同步到达的可能性。因此,caviomorph起源的研究提出了直接的生物地理问题。这个问题促使人们利用基本依赖于核数据的分子测年技术来对口鼻棘突的进化进行分析。但是,有关主要腔vio类谱系的系统发育和年代顺序仍存在疑问。为了增强对新大陆上棘齿亚科进化的理解,我们对caviomorphs的新线粒体基因组进行了测序,并对核基因进行了综合分析。

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