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The enigmatic Leiosaurae clade: Phylogeography, species delimitation, phylogeny and historical biogeography of its southernmost species.
Molecular Phylogenetics and Evolution ( IF 3.6 ) Pub Date : 2019-12-26 , DOI: 10.1016/j.ympev.2019.106725
Martin M Femenias 1 , Luciano J Avila 1 , Jack W Sites 2 , Mariana Morando 3
Affiliation  

The clade Leiosaurae is composed of poorly-known species endemic to the southern region of South America. The difficulties of finding these lizards in the field, and their highly conserved morphology, have limited our taxonomic knowledge and understanding of their evolutionary histories. Here, we use data collected over 9 years to study the phylogenetic history, genetic diversity, and biogeographic history of almost all the southernmost species of Leiosaurae (except P. nigroigulus), including: Leiosaurus bellii, Diplolaemus darwinii, D. bibronii, D. sexcinctus and D. leopardinus. We use a fragment of the mitochondrial cytochrome-b gene to resolve general phylogeographic patterns, and add another mitochondrial gene and eight nuclear genes to perform species delimitation and phylogenetic analyses associated with divergence times. We found evidence for three putative new species-level taxa within L. bellii and five within Diplolaemus species, indicating high levels of geographic structure. We use a time-calibrated phylogeny to estimate ranges of ancestral distributions and to generate new hypotheses about their historical biogeography.

中文翻译:

神秘的Leioosaurae进化枝:其最南端物种的系统地理学,物种界定,系统发生和历史生物地理学。

Leiosaurae进化枝由南美洲南部地区特有的鲜为人知的物种组成。在野外发现这些蜥蜴的困难及其高度保守的形态限制了我们的分类学知识和对其进化史的理解。在这里,我们使用9年来收集的数据来研究几乎所有最南端的Leiosaurae物种(除P. nigroigulus以外)的系统发育史,遗传多样性和生物地理史,其中包括:Bellosa,Diplolaemus darwinii,D。bibronii,D。 sexcinctus和D. leopardinus。我们使用线粒体细胞色素b基因的一个片段来解析一般的系统学模式,并添加另一个线粒体基因和八个核基因来进行物种定界和与发散时间相关的系统发育分析。我们找到了证据,证明在贝氏乳杆菌中有三个推定的新物种级分类群,在梁龙属物种中有五个,表明地理结构水平很高。我们使用时间校准的系统发育来估计祖先分布的范围,并就其历史生物地理学产生新的假设。
更新日期:2019-12-27
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