A molecular phylogenetic framework for the phylum Ctenophora using 18S rRNA genes
A molecular phylogenetic framework for the phylum Ctenophora using 18S rRNA genes
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DOI：
10.1006/mpev.2001.1036
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发表时间：
2001-11-01
影响因子：
4.1
通讯作者：
Harbison, GR
中科院分区：
文献类型：
--
作者：
Podar, M;Haddock, SHD;Harbison, GR
本文介绍了第一个分子系统发育分析的门栉水母，利用18S核糖体RNA序列的大多数主要类群。栉水母形成了一个独特的单系群，基于这个基因的遗传，它与刺胞动物的关系最为密切。我们的研究结果表明，祖先的栉水母是tentaculate和cydippid样，目前公认的顺序Cydippida形成一个多系群。我们研究的其他栉水母目（瓣目，Beroida和Platyctenida）是次要的cydipid类祖先，这一结论也支持发育和形态学数据。特征栉水母18S rRNA基因序列之间非常短的进化距离表明，现存的栉水母来自最近的共同祖先。这对今后的研究和了解后生动物的进化具有重要意义。(C)北京：科学出版社.
This paper presents the first molecular phylogenetic analysis of the phylum Ctenophora, by use of 18S ribosomal RNA sequences from most of the major taxa. The ctenophores form a distinct monophyletic group that, based on this gene phylogeny, is most closely related to the cnidarians. Our results suggest that the ancestral ctenophore was tentaculate and cydippid-like and that the presently recognized order Cydippida forms a polyphyletic group. The other ctenophore orders that we studied (Lobata, Beroida, and Platyctenida) are secondarily derived from cydippid-like ancestors, a conclusion that is also supported by developmental and morphological data. The very short evolutionary distances between characterized ctenophore 18S rRNA gene sequences suggests that extant ctenophores are derived from a recent common ancestor. This has import-ant consequences for future studies and for an understanding of the evolution of the metazoans. (C) 2001 Academic Press.