Phylogenetic confirmation of the genusRobbea(Nematoda: Desmodoridae, Stilbonematinae) with the description of three new species,Systematics and Biodiversity

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Phylogenetic confirmation of the genusRobbea(Nematoda: Desmodoridae, Stilbonematinae) with the description of three new species
Systematics and Biodiversity ( IF 1.9 ) Pub Date : 2014-08-07 , DOI: 10.1080/14772000.2014.941038
Jörg A Ott ₁ , Harald R Gruber-Vodicka ₂ , Nikolaus Leisch ₃ , Judith Zimmermann ₂

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ABSTRACT The Stilbonematinae are a monophyletic group of marine nematodes that are characterized by a coat of thiotrophic bacterial symbionts. Among the ten known genera of the Stilbonematinae, the genus Robbea Gerlach 1956 had a problematic taxonomic history of synonymizations and indications of polyphyletic origin. Here we describe three new species of the genus, R. hypermnestra sp. nov., R. ruetzleri sp. nov. and R. agricola sp. nov., using conventional light microscopy, interference contrast microscopy and SEM. We provide 18S rRNA gene sequences of all three species, together with new sequences for the genera Catanema and Leptonemella. Both our morphological analyses as well as our phylogenetic reconstructions corroborate the genus Robbea. In our phylogenetic analysis the three species of the genus Robbea form a distinct clade in the Stilbonematinae radiation and are clearly separated from the clade of the genus Catanema, which has previously been synonymized with Robbea. Surprisingly, in R. hypermnestra sp. nov. all females are intersexes exhibiting male sexual characters. Our extended dataset of Stilbonematinae 18S rRNA genes for the first time allows the identification of the different genera, e.g. in a barcoding approach. http://zoobank.org/urn:lsid:zoobank.org:pub:D37C3F5A-CF2B-40E6-8B09-3C72EEED60B0

中文翻译：

罗贝亚属（线虫科：线虫科、芪科）的系统发育确认及三个新种的描述

摘要 Stilbonematinae 是海洋线虫的单系群，其特征是一层硫营养细菌共生体。在 10 个已知的 Stilbonematinae 属中，Robbea Gerlach 属 1956 的同义词和多系起源迹象的分类历史存在问题。在这里，我们描述了该属的三个新物种，R. hypermnestra sp。十一月，R. ruetzleri sp. 十一月和 R. agricola sp。11 月，使用传统光学显微镜、干涉对比显微镜和 SEM。我们提供所有三个物种的 18S rRNA 基因序列，以及 Catanema 和 Leptonemella 属的新序列。我们的形态学分析和系统发育重建都证实了 Robbea 属。在我们的系统发育分析中，Robbea 属的三个物种在 Stilbonematinae 辐射中形成了一个独特的进化枝，并且与之前与 Robbea 同义的 Catanema 属的进化枝明显分离。令人惊讶的是，在 R. hypermnestra sp. 十一月所有女性都是表现出男性性特征的双性人。我们首次扩展了芪属 18S rRNA 基因的数据集，允许识别不同的属，例如在条形码方法中。http://zoobank.org/urn:lsid:zoobank.org:pub:D37C3F5A-CF2B-40E6-8B09-3C72EEED60B0 我们首次扩展了芪属 18S rRNA 基因的数据集，允许识别不同的属，例如在条形码方法中。http://zoobank.org/urn:lsid:zoobank.org:pub:D37C3F5A-CF2B-40E6-8B09-3C72EEED60B0 我们首次扩展了芪属 18S rRNA 基因的数据集，允许识别不同的属，例如在条形码方法中。http://zoobank.org/urn:lsid:zoobank.org:pub:D37C3F5A-CF2B-40E6-8B09-3C72EEED60B0

更新日期：2014-08-07

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