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首页> 外文期刊>Marine ecology >Sipunculus nudus Linnaeus, 1766 (Sipuncula): cosmopolitan or a group of pseudo-cryptic species? An integrated molecular and morphological approach
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Sipunculus nudus Linnaeus, 1766 (Sipuncula): cosmopolitan or a group of pseudo-cryptic species? An integrated molecular and morphological approach

机译：Sipunculus nudus Linnaeus，1766年（Sipuncula）：世界性的还是一组伪隐性物种？综合的分子和形态学方法

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摘要

Sipunculan taxonomy relies on a limited set of external morphological and internal anatomical characters. In addition, this marine group is characterized by an unusual large number of putatively cosmopolitan species. However, this 'cosmopolitan' status could be an artifact of their conserved morphology and the small number of unambiguous taxonomic characters available for delimiting species. Species delimitation can therefore be aided by molecular techniques. We investigated the case of the widespread and common species Sipunculus nudus Linnaeus, 1766 to determine its systematic validity. We analysed the morphology of multiple specimens of S. nudus collected from 11 localities around the world and undertook phylogenetic analyses using molecular sequence data from four genes (28S rRNA, 16S rRNA, histone H3 and cytochrome c oxidase subunit I). High levels of genetic differentiation are present between distantly related populations of the putative species S. nudus. Five distinct lineages were identified by phylogenetic analyses, three of which - the best-represented populations - can be distinguished morphologically. Our phylogenetic and morphological analyses thus do not favor the cosmopolitan status of S. nudus, suggesting instead that it constitutes a complex of morphologically similar but distinguishable species.
机译：Sipunculan分类法依赖于一组有限的外部形态和内部解剖特征。另外，该海洋群的特征是异常大量的假定世界性物种。但是，这种“国际化”状态可能是其保守形态和少量可用于界定物种的明确分类学特征的产物。因此，物种定界可以通过分子技术来辅助。我们调查了1766年普遍存在的常见物种Sipunculus nudus Linnaeus的情况，以确定其系统有效性。我们分析了从世界各地11个地方收集的多个葡萄球菌标本的形态，并使用来自四个基因（28S rRNA，16S rRNA，组蛋白H3和细胞色素C氧化酶亚基I）的分子序列数据进行了系统发育分析。推定物种沙门氏菌的远缘种群之间存在高水平的遗传分化。通过系统发育分析鉴定出五个不同的谱系，其中三个-代表性最强的群体-在形态上可以区分。因此，我们的系统发育和形态学分析并不赞成裸露链球菌的国际化地位，这表明它构成了形态相似但可区分物种的复合体。

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