An integrative approach underscores the taxonomic status of Lamellidens exolescens, a freshwater mussel from the Oriental tropics (Bivalvia: Unionidae)
An integrative approach underscores the taxonomic status of Lamellidens exolescens, a freshwater mussel from the Oriental tropics (Bivalvia: Unionidae)
复制标题
DOI：
10.1080/14772000.2016.1249530
复制
发表时间：
2017-01-01
影响因子：
1.9
通讯作者：
Kondakov, Alexander V.
中科院分区：
文献类型：
--
作者：
Konopleva, Ekaterina S.;Bolotov, Ivan N.;Kondakov, Alexander V.
东方地区拥有世界上第二丰富的淡水双壳类动物群，其中包括许多濒临灭绝的特有类群。然而，使用综合分类学方法对东方动物群的乌节科动物群进行的研究非常少，该方法可以根据形态学、分子、生物地理学和生态证据对复杂（神秘）类群进行合理修正。在这里，我们提出了关于 Unio exolescens Gould (1843) 地位的综合分类学修订的第一个例子，这是一个名义上的贻贝分类单元，被接受为 Trapezoideus Simpson (1900) 属内的有效物种。目前，Trapezideus exolescens 被认为是该属的模式，而最初指定的模式种 U. foliaceus Gould (1843) 被认为是 T. exolescens 的异名。利用从线粒体（COI 和 16S rRNA）和核（28S rDNA）基因获得的核苷酸序列，我们发现 Unio exolescens Gould (1843) 的拓扑型与另一个贻贝属 Lamellidens Simpson (1900) 的代表聚类在一起。基于这些结果和形态学数据，我们将 Unio exolescens Gould (1843) 从 Trapezoideus 转移到 Lamellidens 并提出 Lamellidens exolescens (Gould, 1843) 梳。十一月此外，我们根据模式标本的形态学研究重新审视了 Unio foliaceus Gould (1843) 作为有效种的地位以及梯形属的类型，尽管由于其分子序列不可用，有关该分类单元的真实位置的问题仍然悬而未决。我们的研究结果强调，综合分类方法是一个重要的工具，特别是在处理像东方王国这样物种丰富的Unionidae动物群时。
The Oriental Region harbours the second richest fauna of freshwater bivalves in the world, including many endangered endemic taxa. However, the Oriental fauna of the Unionidae have been very poorly studied using an integrative taxonomic approach, which may provide reasonable revisions of complicated (cryptic) taxa based on morphological, molecular, biogeographic and ecological evidence. Here, we present the first example of an integrative taxonomic revision concerning the status of Unio exolescens Gould (1843), a nominal mussel taxon that was accepted as a valid species within the genus Trapezoideus Simpson (1900). Currently, Trapezoideus exolescens is considered the type of the genus as far as the originally designated type species, U. foliaceus Gould (1843), was considered to be a synonym of T. exolescens. Using nucleotide sequences obtained from mitochondrial (COI and 16S rRNA) and nuclear (28S rDNA) genes, we found that the topotypes of Unio exolescens Gould (1843) cluster together with representatives of another mussel genus, Lamellidens Simpson (1900). Based on these results and on morphological data, we transfer Unio exolescens Gould (1843) from Trapezoideus to Lamellidens and propose Lamellidens exolescens (Gould, 1843) comb. nov. In addition, we revisited the status of Unio foliaceus Gould (1843) as a valid species and the type of the genus Trapezoideus based on the morphological study of the type specimen, although a question concerning the true position of this taxon is still open because its molecular sequences are not available. Our findings highlight that an integrative taxonomic approach is an important tool, particularly when dealing with such species-rich Unionidae fauna as those of the Oriental Realm.