Major Revisions in Pancrustacean Phylogeny and Evidence of Sensitivity to Taxon Sampling
Major Revisions in Pancrustacean Phylogeny and Evidence of Sensitivity to Taxon Sampling
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甲壳动物系统发育的重大修订和对分类单元采样敏感性的证据
DOI：
10.1093/molbev/msad175
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发表时间：
2023
影响因子：
10.7
通讯作者：
Crandall, Keith A
中科院分区：
文献类型：
--
作者：
Bernot, James P;Owen, Christopher L;Wolfe, Joanna M;Meland, Kenneth;Olesen, Jørgen;Crandall, Keith A
Pancrustacea 分支由甲壳类和六足类动物组成，是地球上最多样化的动物类群，包含超过 80% 的动物物种和一半的动物生物量。它一直是最近几项系统发育分析的主题，但全甲壳纲内部的关系显示出明显缺乏稳定性。在这里，系统发育是通过扩大分类单元采样来估计的，特别是软甲纲。我们表明分类单元采样的微小变化对系统发育估计有很大影响。通过分析两个略有不同的分类单元集之间的相同直向同源物，我们表明所得到的拓扑的差异主要是由于分类单元采样对系统发育重建方法的影响。我们将系统发育学分析产生的树与文献中的树进行比较，以探索泛甲壳类系统发育假设的大树空间，并发现统计拓扑测试拒绝了先前发表的树，而支持此处生成的最大似然树。我们的结果拒绝了几个进化枝，包括 Caridoida、Eucarida、Multicrustacea、Vericrustacea 和 Syncarida。值得注意的是，我们发现桡足类以高支持度嵌套在 Allotriocarida 中，并在十足目动物、磷虾科和 Syncarids 之间恢复了一种新的关系，我们将其称为 Syneucarida。通过更密集的分类单元采样，我们发现口足纲是后一个进化枝的姐妹，我们将其统称为 Stomatocarida，将软甲纲分为三个进化枝：Leptostraca、Peracarida 和 Stomatocarida。使用 13 个经过审查的化石进行了新的贝叶斯发散时间估计。我们在其他胰甲壳类系统发育假设的背景下回顾了我们的结果，并重点介绍了 15 个关键类群以供未来研究样本。
The clade Pancrustacea, comprising crustaceans and hexapods, is the most diverse group of animals on earth, containing over 80% of animal species and half of animal biomass. It has been the subject of several recent phylogenomic analyses, yet relationships within Pancrustacea show a notable lack of stability. Here, the phylogeny is estimated with expanded taxon sampling, particularly of malacostracans. We show small changes in taxon sampling have large impacts on phylogenetic estimation. By analyzing identical orthologs between two slightly different taxon sets, we show that the differences in the resulting topologies are due primarily to the effects of taxon sampling on the phylogenetic reconstruction method. We compare trees resulting from our phylogenomic analyses with those from the literature to explore the large tree space of pancrustacean phylogenetic hypotheses and find that statistical topology tests reject the previously published trees in favor of the maximum likelihood trees produced here. Our results reject several clades including Caridoida, Eucarida, Multicrustacea, Vericrustacea, and Syncarida. Notably, we find Copepoda nested within Allotriocarida with high support and recover a novel relationship between decapods, euphausiids, and syncarids that we refer to as the Syneucarida. With denser taxon sampling, we find Stomatopoda sister to this latter clade, which we collectively name Stomatocarida, dividing Malacostraca into three clades: Leptostraca, Peracarida, and Stomatocarida. A new Bayesian divergence time estimation is conducted using 13 vetted fossils. We review our results in the context of other pancrustacean phylogenetic hypotheses and highlight 15 key taxa to sample in future studies.