Phylogenomics and generic limits of Dypsidinae (Arecaceae), the largest palm radiation in Madagascar

With 178 species, the palm subtribe Dypsidinae is one of the largest plant radiations on Madagascar. A well-resolved species-level phylogeny is required not only to unpick the drivers of this spectacular radiation but also to define natural and useful generic limits in this taxonomically difficult group. The only recent taxonomic revision of Dypsidinae recognized just four genera, including the large genus Dypsis (currently with 172 species), which was considered impossible to divide further based on morphology alone. Here we describe the first comprehensively sampled species-level phylogeny of Dypsidinae, including 157 described species (88% of the subtribe) as well as 10 samples of uncertain taxonomic identity (potential new species). Our tree is based on target sequence capture data for 161 nuclear DNA loci. The phylogenetic relationships recovered render Dypsis s.l. paraphyletic, requiring the resurrection of two previously synonymised genera. In total, we recognize six genera in Dy...

棕榈亚族Dypsidinae（Dypsidinae）共包含178个物种，是马达加斯加境内规模最大的植物适应辐射类群之一。构建分辨率优异的物种水平系统发育树，不仅可阐明该类群如此壮观的适应辐射的驱动机制，还能为这个分类学棘手的类群界定自然且实用的属级界限。目前针对Dypsidinae仅有的最新分类学修订仅认可4个属，其中包含拥有172个物种的大型属Dypsis（Dypsis）——该属曾被认为仅依靠形态学特征无法进一步拆分。本研究首次构建了采样覆盖度全面的Dypsidinae物种水平系统发育树，涵盖该亚族157个已描述物种（占总物种数的88%），以及10份分类学身份待定的样本（推测为新物种）。本系统发育树基于161个核DNA位点的靶向序列捕获数据构建。重建得到的系统发育关系显示广义Dypsis（Dypsis s.l.）为并系类群，因此需要恢复2个此前被异名化的属。综上，本研究共承认Dy...类群下的6个属。