The first comprehensive molecular phylogeny of Bryozoa (Ectoprocta) based on combined analyses of nuclear and mitochondrial genes
The first comprehensive molecular phylogeny of Bryozoa (Ectoprocta) based on combined analyses of nuclear and mitochondrial genes
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DOI：
10.1016/j.ympev.2009.01.021
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发表时间：
2009-07-01
影响因子：
4.1
通讯作者：
Sundberg, Per
中科院分区：
文献类型：
--
作者：
Fuchs, Judith;Obst, Matthias;Sundberg, Per
苔藓虫是动物界中最令人费解的门之一，人们对它们的进化史知之甚少。它在后生动物中的系统发育地位以及它的门内关系仍未确定。本文首次根据线粒体基因COI和两个核基因18S rDNA和28S rDNA对苔藓动物进行了全面的分子系统学研究，包括23科32种。我们的研究表明，单系地位不仅适用于先前定义的苔藓动物纲，也适用于该门。28S rDNA序列支持泡囊藻类和Stenolaemata类的亲缘关系，而部分COI和18S rDNA显示淡水泡囊藻类为基生苔藓动物。裸口亚纲一般分为软体类(Ctenostomata)和硬体类(Cheilostomata)。在我们的分析中，所有这三个基因都与这一假设相冲突，并显示出坚硬的身体形态在裸体动物中进化了几次。(C)2009 Elsevier Inc.保留所有权利。
Bryozoa is one of the most puzzling phyla in the animal kingdom and little is known about their evolutionary history. Its phylogenetic position among the Metazoa remains unsettled, as well as its intra-phylum relationships. Here, we present the first comprehensive molecular phylogeny of Bryozoa based on the mitochondrial gene COI and two nuclear genes 18S rDNA and 28S rDNA including 32 species from 23 families. We show that the monophyletic status is supported for the phylum as well as for previously defined bryozoan classes. The 28S rDNA supports a close relationship of Phylactolaemata and Stenolaemata, while partial COI and 18S rDNA show the freshwater Phylactolaemata as basal bryozoans. The Gymnolaemata have generally been divided into soft-bodied forms (Ctenostomata) and hard-bodied species (Cheilostomata). In our analyses all three genes conflict with this assumption and show hard body forms having evolved within Gymnolaemata several times. (C) 2009 Elsevier Inc. All rights reserved.