Molecular phylogeny of naidid worms (Annelida: Clitellata) based on cytochrome oxidase I
Molecular phylogeny of naidid worms (Annelida: Clitellata) based on cytochrome oxidase I
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DOI：
10.1016/s1055-7903(03)00180-5
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发表时间：
2004-01-01
影响因子：
4.1
通讯作者：
Wray, GA
中科院分区：
文献类型：
--
作者：
Bely, AE;Wray, GA
奈德科动物是微小的，主要是淡水寡毛类环节动物，通过裂变进行无性繁殖。我们通过对 26 个水母科物种（代表目前已识别的 23 个属中的 13 个）以及它们最亲密的盟友 4 个水母科的线粒体基因细胞色素氧化酶 I (COI) 的 1224 bp 进行测序，研究了该类群内的系统发育关系。尽管不完全一致，但最大简约性和贝叶斯推理分析在几个重要方面是一致的，没有得到充分支持的冲突。我们的研究是对奈迪科动物关系的首次详细分子研究，表明奈迪科动物分为两组，一组由普里什蒂纳属组成，另一组由所有其他采样属组成。将naidids明确划分为这两个类群最符合Lastockin (1924)对该类群的早期简单分类； Sperber (1948) 以及 Nemec 和 Brinkhurst (1987) 提出的最新分类与我们的结果不一致。我们注意到，我们的研究表明Stylaria 属由两个不同的物种组成，Stylaria lacustris 和Stylaria fossularis，而不仅仅是单个物种的两种形态类型。根据我们的系统发育结果，我们认为有色素的眼睛在水鸟中只进化了一次，但一定已经丢失了多次，并且前口伸长成长鼻至少独立进化了两次。最简单的裂变形式，即结构分裂（分裂），发生在两个最基础分支的奈德科属中，并且可能代表了奈德科的拟形状况。 (C) 2003 年爱思唯尔科学（美国）。版权所有。
Naidids are tiny, primarily freshwater oligochaete annelids which reproduce asexually by fission. We investigated the phylogenetic relationships within this group by sequencing 1224 bp of the mitochondrial gene cytochrome oxidase I (COI) from 26 species of naidids (representing 13 of the 23 genera currently recognized), as well as from four tubificids, their closest allies. Although not completely concordant, maximum parsimony and Bayesian inference analyses agreed in several important respects, with no well-supported conflicts. Our study, the first detailed molecular investigation of naidid relationships, suggests that naidids fall into two groups, one comprised of the genus Pristina, and another comprised of all other genera sampled. The clear division of naidids into these two groups best matches an early, simple classification of the group by Lastockin (1924); the more recent classifications proposed by Sperber (1948) and Nemec and Brinkhurst (1987) are not as consistent with our results. We note that our study suggests the genus Stylaria is comprised of two distinct species, Stylaria lacustris and Stylaria fossularis, rather than merely two morphotypes of a single species. Based on our phylogenetic results, we suggest that pigmented eyes evolved only once among naidids but must have been lost multiple times, and that the elongation of the prostomium into a proboscis evolved at least twice independently. The simplest form of fission, architomy (fragmentation), occurs in two of the most basally branching naidid genera, and may represent the plesiomorphic condition for naidids. (C) 2003 Elsevier Science (USA). All rights reserved.