Multilocus phylogeny, species delimitation and biogeography of Iberian valvatiform springsnails (Caenogastropoda: Hydrobiidae), with the description of a new genus
Multilocus phylogeny, species delimitation and biogeography of Iberian valvatiform springsnails (Caenogastropoda: Hydrobiidae), with the description of a new genus
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DOI：
10.1093/zoolinnean/zly093
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发表时间：
2019-08-01
影响因子：
2.8
通讯作者：
Ramos, Marian A.
中科院分区：
文献类型：
--
作者：
Delicado, Diana;Arconada, Beatriz;Ramos, Marian A.
水螅科的瓣形腹足类经常在欧洲的春季饲养系统中发现。它们的简化和有时趋同的形态结构和有限的地理范围使瓣状种的描述和鉴定具有挑战性。在伊比利亚半岛，迄今为止，20瓣形种已被描述形态。为了测试形态物种界定和评估自然地理的作用，他们的进化历史，我们分析了两个线粒体（COI和16 S rRNA）和两个核（28 S rRNA和18 S rRNA）基因片段的16个瓣形物种从伊比利亚半岛。分子种划分方法一致地推断出11个命名种。我们的系统发育分析恢复的物种伊斯兰azarum作为一个独立的血统，远相关的其他属，我们在新属Deganta。此外，伊比利亚瓣形水螅虫不形成一个单系亚基，但它们被包括在两个不同的分支水螅虫科。分歧的时间表明，在这些分支的物种形成很可能与形成的主要伊比利亚山脉和河流流域。该组合与非瓣形属Corrosella之间的地理细分和分歧时间的相似性为伊比利亚地理障碍在塑造这些弹簧蜗牛的地理分布中的作用提供了有力的证据。
Valvatiform gastropods of the family Hydrobiidae are frequently found in European spring-fed systems. Their simplified and sometimes convergent morphological structures and restricted geographical ranges make the description and identification of valvatiform species challenging. In the Iberian Peninsula, to date, 20 valvatiform species have been described morphologically. To test morphological species delimitations and to evaluate the role of physical geography on their evolutionary history, we analysed two mitochondrial (COI and 16S rRNA) and two nuclear (28S rRNA and 18S rRNA) gene fragments of 16 valvatiform species from the Iberian Peninsula. Molecular species delimitation methods consistently inferred 11 of the nominal species. Our phylogenetic analyses recovered the species Islamia azarum as an independent lineage, distantly related to other genera, which we place in the new genus Deganta. Furthermore, Iberian valvatiform hydrobiids do not form a monophyletic subunit, but they are included in two distinct clades of Hydrobiidae. Divergence times indicate that speciation in these clades is likely to have coincided with the formation of major Iberian mountain ranges and river basins. Similarities of geographical subdivision and divergent times between this assemblage and the non-valvatiform genus Corrosella provide strong evidence for the role of the Iberian geographical barriers in shaping the biogeography of these springsnails.