Molecular evidence for Acanthocephala as a subtaxon of Rotifera
Molecular evidence for Acanthocephala as a subtaxon of Rotifera
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DOI：
10.1007/bf02338837
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发表时间：
1996-09-01
影响因子：
3.9
通讯作者：
Nadler, SA
中科院分区：
文献类型：
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作者：
Garey, JR;Near, TJ;Nadler, SA
轮虫是自由生活的动物，通常小于1毫米，拥有一个独特的轮器官。棘头蠕虫是一种较大的体内寄生动物，利用脊椎动物和节肢动物完成其生命周期。分类群中的头轮虫和轮虫被认为是独立的门，通常在分类群中。利用18SrRNA基因序列重新研究了轮虫和头轮虫的亲缘关系。我们的结果最终表明，棘头虫是蛭形亚目轮虫的姊妹群。轮虫是非单系的，在所有的分子分析，这支持的假设，即在轮虫门，而不是一个单独的门的dumocephala代表一个分类单元。这些结果同意以前的形态特征的分支研究。
Rotifers are free-living animals usually smaller than 1 mm that possess a characteristic wheel organ. Acanthocephalans (thorny-headed worms) are larger endoparasitic animals that use vertebrates and arthropods to complete their life cycle. The taxa Acanthocephala and Rotifera are considered separate phyla, often within the taxon Aschelminthes. We have reexamined the relationship between Rotifera and Acanthocephala using 18S rRNA gene sequences. Our results conclusively show that Acanthocephala is the sister group of the rotifer class Bdelloidea. Rotifera was nonmonophyletic in all molecular analyses, which supports the hypothesis that the Acanthocephala represent a taxon within the phylum Rotifera and not a separate phylum. These results agree with a previous cladistic study of morphological characters.