Molecular phylogenetic evidence that the Chinese viviparid genus Margarya (Gastropoda: Viviparidae) is polyphyletic
Molecular phylogenetic evidence that the Chinese viviparid genus Margarya (Gastropoda: Viviparidae) is polyphyletic
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DOI：
10.1007/s11434-012-5632-y
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发表时间：
2013-06-01
影响因子：
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通讯作者：
Aldridge, David
中科院分区：
文献类型：
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作者：
Du LiNa;Yang JunXing;Aldridge, David
我们使用两个线粒体基因片段（COI 和 16S rRNA）研究了中国云南特有的胎生玛格丽亚属的系统发育。基于组合数据集的分子系统发育表明 Margarya 是多系的，因为包含 Margarya 物种的三个得到充分支持的进化枝中的两个也包含来自其他胎生属的物种。在一个分支中，四种 Margarya 物种的序列甚至不加区别地与两种 Cipangopaludina 的序列聚类在一起，表明亚洲胎生动物分类学的现状需要修订。此外，这些数据表明胎生动物的贝壳进化是复杂的，因为即使是亚洲胎生动物中突出的大型且雕刻精美的玛格丽亚贝壳，也可以很容易地转化为简单的光滑贝壳。分子数据还表明，应该重新评估六种现存 Margarya 物种的物种状况。
We investigated the phylogeny of the viviparid genus Margarya, endemic to Yunnan, China, using two mitochondrial gene fragments (COI and 16S rRNA). The molecular phylogeny based on the combined dataset indicates that Margarya is polyphyletic, as two of the three well-supported clades containing species of Margarya also comprise species from other viviparid genera. In one clade, sequences of four species of Margarya even cluster indiscriminately with those of two species of Cipangopaludina, indicating that the current state of Asian viviparid taxonomy needs to be revised. Additionally, these data suggest that shell evolution in viviparids is complex, as even the large and strongly sculptured shells of Margarya, which are outstanding among Asian viviparids, can apparently be easily converted to simple smooth shells. The molecular data also indicate that the species status of the six extant species of Margarya should be re-assessed.