Phylogenetic relationships of platyhelminthes based on 18S ribosomal gene sequences
Phylogenetic relationships of platyhelminthes based on 18S ribosomal gene sequences
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DOI：
10.1006/mpev.1997.0483
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发表时间：
1998-08-01
影响因子：
4.1
通讯作者：
Laclette, JP
中科院分区：
文献类型：
--
作者：
Campos, A;Cummings, MP;Laclette, JP
采用最大似然法分析了71种扁形动物18 S核糖体RNA的核苷酸序列，并将所得系统发育树与以前的系统发育假设进行了比较。包括属于其他8门的15个外群种的分析表明，扁形动物是单系的，除了Acoela sp.的一个序列pueculum外，Lecithoepitheliata、Polycladida、Tricladida、Trematoda（Aspidobothrii + Digenea）、Monogenea和Cestoda（Gyrocotylidea + Amphilinidea + Eucestoda）是单系类群。链形动物与其他的扁形动物形成姊妹群，而由Acoela，Tricladida，Dalyellioida和Typhloplanoida组成的复杂分支与Neodermata是姊妹群。“盲行目”似乎不是单系的;粪形目似乎不属于“达里类”，卡里普托吻目也不属于“盲行目”。“Trematoda是Neodermata其余部分的姐妹群，Monogenea是Cestoda的姐妹群。在吸虫类中，Aspidobothrii是Digenea的姐妹群，Heronimidae是Digenea中最基本的科。我们的树支持这一假设，寄生进化至少两次在扁形动物，一次在祖先Neodermata和再次在Fecampiida的祖先，独立于pueromatic寄生“Dalyellioida的祖先。（C）1998年学术出版社。
Nucleotide sequences of 18S ribosomal RNA from 71 species of Platyhelminthes, the flatworms, were analyzed using maximum likelihood, and the resulting phylogenetic trees were compared with previous phylogenetic hypotheses. Analyses including 15 outgroup species belonging to eight other phyla show that Platyhelminthes are monophyletic with the exception of a sequence putatively from Acoela sp., Lecithoepitheliata, Polycladida, Tricladida, Trematoda (Aspidobothrii + Digenea), Monogenea, and Cestoda (Gyrocotylidea + Amphilinidea + Eucestoda) are monophyletic groups. Catenulids form the sister group to the rest of platyhelminths, whereas a complex clade formed by Acoela, Tricladida, "Dalyellioida," and perhaps "Typhloplanoida" is sister to Neodermata. "Typhloplanoida" does not appear to be monophyletic; Fecampiida does not appear to belong within "Dalyellioida," nor Kalyptorhynchia within "Typhloplanoida." Trematoda is the sister group to the rest of Neodermata, and Monogenea is sister group to Cestoda. Within Trematoda, Aspidobothrii is the sister group of Digenea and Heronimidae is the most basal family in Digenea. Our trees support the hypothesis that parasitism evolved at least twice in Platyhelminthes, once in the ancestor to Neodermata and again in the ancestor of Fecampiida, independently to the ancestor of putatively parasitic "Dalyellioida." (C) 1998 Academic Press.