期刊
MOLECULAR BIOLOGY AND EVOLUTION
卷 33, 期 3, 页码 621-642出版社
OXFORD UNIV PRESS
DOI: 10.1093/molbev/msv250
关键词
mammals; Xenarthra; shotgun Illumina sequencing; molecular phylogenetics; mitochondrial genomes; molecular dating
资金
- EU [286431]
- Centre National de la Recherche Scientifique (CNRS)
- Scientific Council of Universite Montpellier [2 (UM2)]
- Investissement d'Avenir of the Agence Nationale de la Recherche [CEBA: ANR-10-LABX-25-01]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Research Chairs program
Xenarthra (armadillos, sloths, and anteaters) constitutes one of the four major clades of placental mammals. Despite their phylogenetic distinctiveness in mammals, a reference phylogeny is still lacking for the 31 described species. Here we used Illumina shotgun sequencing to assemble 33 new complete mitochondrial genomes, establishing Xenarthra as the first major placental clade to be fully sequenced at the species level for mitogenomes. The resulting data set allowed the reconstruction of a robust phylogenetic framework and timescale that are consistent with previous studies conducted at the genus level using nuclear genes. Incorporating the full species diversity of extant xenarthrans points to a number of inconsistencies in xenarthran systematics and species definition. We propose to split armadillos into two distinct families Dasypodidae (dasypodines) and Chlamyphoridae (euphractines, chlamyphorines, and tolypeutines) to better reflect their ancient divergence, estimated around 42 Ma. Species delimitation within long-nosed armadillos (genus Dasypus) appeared more complex than anticipated, with the discovery of a divergent lineage in French Guiana. Diversification analyses showed Xenarthra to be an ancient clade with a constant diversification rate through time with a species turnover driven by high but constant extinction. We also detected a significant negative correlation between speciation rate and past temperature fluctuations with an increase in speciation rate corresponding to the general cooling observed during the last 15 My. Biogeographic reconstructions identified the tropical rainforest biome of Amazonia and the Guiana Shield as the cradle of xenarthran evolutionary history with subsequent dispersions into more open and dry habitats.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据