Phylogenomic analyses of deep gastropod relationships reject Orthogastropoda
Phylogenomic analyses of deep gastropod relationships reject Orthogastropoda
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DOI：
10.1098/rspb.2014.1739
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发表时间：
2014-07
期刊：
影响因子：
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通讯作者：
F. Zapata;N. Wilson;M. Howison;S. Andrade;K. Jörger;M. Schrödl;Freya E. Goetz;Gonzalo Giribet;C. Dunn
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文献类型：
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作者：
F. Zapata;N. Wilson;M. Howison;S. Andrade;K. Jörger;M. Schrödl;Freya E. Goetz;Gonzalo Giribet;C. Dunn
腹足类是一种高度多样化的软体动物分支，包括许多熟悉的动物，如帽贝、蜗牛、鼻涕和海参。它是海洋中最丰富的动物群体之一，也是唯一成功在陆地上定居的软体动物血统。然而，在一个多世纪的形态、解剖学和分子研究中，其组成支系之间和内部的关系一直在变化。在这里，我们通过收集40个物种的新转录组数据，并结合公开可用的基因组和转录组进行分析，重新评估腹足类的系统发育关系。我们的数据集包括所有五个主要的腹足类支系：斑腿腹足纲、香根腹足纲、网足亚纲、后腹足亚纲和异鳃亚纲。我们使用两种不同的方法来分配正交，将每个矩阵细分为三个日益密集的子集，并使用两种不同的分子进化模型分析所有六个超矩阵。所有12项分析都得出了连接五大腹足类谱系的相同的无根网络。这将深层腹足动物的系统发育简化为三种可供选择的生根假说。这些结果否定了腹足动物系统发育的流行假说--直腹足纲。这棵古老的树与二叠纪末可能恢复的一些腹足类分支一致，即Caenogasterpoda和一些Heterobranchia亚支。
Gastropods are a highly diverse clade of molluscs that includes many familiar animals, such as limpets, snails, slugs, and sea slugs. It is one of the most abundant groups of animals in the sea and the only molluscan lineage that has successfully colonised land. Yet the relationships among and within its constituent clades have remained in flux for over a century of morphological, anatomical and molecular study. Here we re-evaluate gastropod phylogenetic relationships by collecting new transcriptome data for 40 species and analysing them in combination with publicly available genomes and transcriptomes. Our datasets include all five main gastropod clades: Patellogastropoda, Vetigastropoda, Neritimorpha, Caenogastropoda and Heterobranchia. We use two different methods to assign orthology, subsample each of these matrices into three increasingly dense subsets, and analyse all six of these supermatrices with two different models of molecular evolution. All twelve analyses yield the same unrooted network connecting the five major gastropod lineages. This reduces deep gastropod phylogeny to three alternative rooting hypotheses. These results reject the prevalent hypothesis of gastropod phylogeny, Orthogastropoda. Our dated tree is congruent with a possible end-Permian recovery of some gastropod clades, namely Caenogastropoda and some Heterobranchia subclades.