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首页> 外文期刊>Chinese science bulletin >Phylogeny and divergence time estimation of cheilostome bryozoans based on mitochodrial 16S rRNA sequences
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Phylogeny and divergence time estimation of cheilostome bryozoans based on mitochodrial 16S rRNA sequences

机译：基于线粒体16S rRNA序列的口吻成虫苔藓虫的系统发育和发散时间估计

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摘要

The mitochondrial 16S rDNA sequences of 40 species of cheilostome bryozoans including those of 24 species newly determined were used to reconstruct the phylogenetic tree using neighboring-joining and maximum-parsimony methods. By applying molecular clock technique on the basis of the appropriate phylogeny and the fossil record, the divergence times of the two main cheilostome groups, Anasca and Ascophora sensu stricto, were estimated. The results show that the molecular phylogeny of the higher taxonomic groups (superfamilies and higher taxa) of cheilostome bryozoans is mostly in conflict with the morphology-based phylogenetic trees; the divergence of the extant groups of Anasca and those of Ascophora sensu stricto is estimated to have happened about 263 Ma (Permian Guadalupian Epoch) and 183 Ma (Early Jurassic), respectively.
机译：利用近邻结合法和最大简约法，利用40种化学发光支原体的线粒体16S rDNA序列，包括新近测定的24种，重建了系统树。通过在适当的系统发育和化石记录的基础上应用分子钟技术，估计了两个主要的吻口目组Anasca和Ascophora sensu stricto的发散时间。结果表明，化学节肢动物苔藓动物的较高分类群（超家族和较高分类群）的分子系统发育与基于形态学的系统发育树相冲突。据估计，现存的阿纳斯卡（Anasca）组和严格的Ascophora sensu组之间的分歧分别发生在约263 Ma（二叠纪瓜达卢普纪）和183 Ma（侏罗纪早期）。

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