Improved phylogenetic resolution within Siphonophora (Cnidaria) with implications for trait evolution
Improved phylogenetic resolution within Siphonophora (Cnidaria) with implications for trait evolution
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DOI：
10.1016/j.ympev.2018.06.030
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发表时间：
2018-10-01
影响因子：
4.1
通讯作者：
Dunn, Casey
中科院分区：
文献类型：
--
作者：
Munro, Catriona;Siebert, Stefan;Dunn, Casey
管水母是一种多样的水生动物（刺胞纲），在海洋的大多数深处都有发现——从表面，像我们熟悉的葡萄牙人一样，到深海。它们在海洋生态系统中扮演着重要的角色，是数量最多的胶状捕食者之一。先前基于两个核糖体RNA基因的系统发育研究为主要虹吸细胞群之间的内部关系提供了见解。然而，在Glade Codonophora内部，很少有支持许多深层关系的证据。在此，我们基于29个虹吸管物种的转录组数据，结合14个公开的基因组和转录组数据，提出了一个新的虹吸管系统发育。我们利用这一新的系统发育重建了虹吸虫生物学的几个核心特征，包括性系统（单雌与雌雄异株）、动物类型的获得和丧失、生活史特征和栖息地。本研究的系统发育关系与以前的系统发育关系基本一致，但我们发现了以前未解决的Codonophora中新分支的强有力支持。这些结果对虹吸管属动物的性状进化具有重要意义，包括支持单性繁殖至少出现两次的假设。
Siphonophores are a diverse group of hydrozoans (Cnidaria) that are found at most depths of the ocean - from the surface, like the familiar Portuguese man of war, to the deep sea. They play important roles in ocean ecosystems, and are among the most abundant gelatinous predators. A previous phylogenetic study based on two ribosomal RNA genes provided insight into the internal relationships between major siphonophore groups. There was, however, little support for many deep relationships within the Glade Codonophora. Here, we present a new siphonophore phylogeny based on new transcriptome data from 29 siphonophore species analyzed in combination with 14 publicly available genomic and transcriptomic datasets. We use this new phylogeny to reconstruct several traits that are central to siphonophore biology, including sexual system (monoecy vs. dioecy), gain and loss of zooid types, life history traits, and habitat. The phylogenetic relationships in this study are largely consistent with the previous phylogeny, but we find strong support for new clades within Codonophora that were previously unresolved. These results have important implications for trait evolution within Siphonophora, including favoring the hypothesis that monoecy arose at least twice.