Molecular phylogeny and taxonomic revision of two enigmatic freshwater mussel genera (Bivalvia: Unionidae incertae sedis: Harmandia and Unionetta) reveals a diverse clade of Southeast Asian Parreysiinae

Molecular phylogeny and taxonomic revision of two enigmatic freshwater mussel genera (Bivalvia: Unionidae incertae sedis: Harmandia and Unionetta) reveals a diverse clade of Southeast Asian Parreysiinae
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两个神秘的淡水贻贝属(双壳纲:Unionidae incertae sedis:Harmandia 和 Unionetta)的分子系统发育和分类学修订揭示了东南亚 Parreysiinae 的多样化分支

DOI:
10.1093/mollus/eyy028
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发表时间:
2018
影响因子:
1.2
通讯作者:
Page, Lawrence M
Page, Lawrence M
中科院分区:
生物学3区
文献类型:
--
作者:
Pfeiffer, John M;Graf, Daniel L;Cummings, Kevin S;Page, Lawrence M

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与其他区域动物群相比,印度热带淡水贻贝组合具有更多的亚科水平不确定的属(即属)。在印度洋热带地区的16个属中,只有两个属,harmandiatta和unionetta分布在东南亚大陆次区域。解决harmandiaandunionetta的神秘系统位置将最终建立一个完整的东南亚淡水贻贝亚科水平的分类,并有助于更全面地评价区域淡水贻贝的多样性和分布。利用核编码的大核糖体亚基rRNA(28S)和线粒体蛋白编码细胞色素c氧化酶亚基I(COI)进行分子系统发育重建,恢复了harmandiandunonettain和印度-非洲热带Parreysiinae亚科,更具体地说,是Indochinellini部落的成员(以前的Oxynaiini)。Harmandiais显示出多系性,其前种属于Unionoida的三个远亲分支(即Parreysiinae, recentininae和Hyriidae)。尽管测序的个体具有很强的形态相似性和接近的地理位置,但也没有恢复为单系。本文在综合分子、形态和生物地理资料的基础上,对其分类和地理分布进行了修正。这些结果在Parreyssiinae在东南亚的扩散和湄公河Indochinellini的物种水平多样性的背景下进行了讨论。
The Indotropical freshwater mussel assemblage has more genera of uncertain subfamily-level position (i.e. generaincertae sedis) than all other regional faunas. Of the 16 generaincertae sedisin the Indotropics, only two,HarmandiaandUnionetta, are distributed in the mainland southeast Asia subregion. Resolving the enigmatic systematic position ofHarmandiaandUnionettawould finally establish a complete subfamily-level classification for the freshwater mussel genera of southeast Asia and facilitate more comprehensive evaluation of regional freshwater mussel diversity and distribution. Molecular phylogenetic reconstructions using the nuclear–encodedlarge ribosomal subunit rRNA(28S) and the mitochondrial protein-codingcytochrome c oxidase subunit I(COI) recoveredHarmandiaandUnionettain the Indo-Afrotropical subfamily Parreysiinae, and more specifically as members of the tribe Indochinellini (formerly Oxynaiini).Harmandiais shown to be polyphyletic with its former species belonging to three distantly related clades of the Unionoida (i.e. Parreysiinae, Rectidentinae and Hyriidae).Unionettawas likewise not recovered as monophyletic, despite the strong morphological similarities and close geographic proximity of the sequenced individuals. Based on a synthesis of molecular, morphological and biogeographic data, the taxonomy and geographic distributions ofHarmandiaandUnionettaare revised. These results are discussed in the context of the dispersal of the Parreyssiinae into Southeast Asia and the species-level diversity of the Indochinellini in the Mekong River.
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