Phylogeny of the land snails Bradybaena and Phaeohelix (Pulmonata: Bradybaenidae) in Japan
Phylogeny of the land snails Bradybaena and Phaeohelix (Pulmonata: Bradybaenidae) in Japan
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DOI：
10.1093/mollus/eyu004
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发表时间：
2014-05-01
影响因子：
1.2
通讯作者：
Chiba, Satoshi
中科院分区：
文献类型：
--
作者：
Hirano, Takahiro;Kameda, Yuichi;Chiba, Satoshi
日本群岛拥有高度多样化的地方性缓虫陆生蜗牛。然而，对这些蜗牛的系统研究很少。这些陆生蜗牛类群的分类和系统发育关系的解决对于描述物种多样性和促进这些陆生螺类的保护都是重要的。我们利用CO1基因和内部转录间隔区基因研究了棘球藻属和棕藻属的分子系统发育，以阐明这些属的形态特征和现有的物种分类是否反映了它们的系统发育关系。我们的结果表明，这些属的日本种在遗传上分为三个支系，并且这些谱系的地理分布格局倾向于反映系统发育关系。虽然这些属的命名种分类与它们的分子系统发育关系不一致，但它们的壳和生殖器形态在一定程度上反映了它们的系统发育关系。系统发育分析和生殖器形态观察结果表明，八条小岛岛的褐线螺属Phaeohelix submandarina、Miyakejimana和Bradybaena Circulus Ocean anica属于Phaeohelix submandarina、P.miyakejimana和Bradybaena Circulus Ocean anica。此外，Bradybaena和Phaeohelix之间的区别没有得到分子系统学的支持，相反，Phaeohelix应该是Bradybaena的同义词。这项研究表明，有必要对日本缓虫科进行进一步的分类修订，为了解决这个问题，除了分子系统发育分析外，生殖器解剖学是有用的。
The Japanese Archipelago harbours high diversity of endemic bradybaenid land snails. However, there have been few systematic studies of these snails. The resolution of the taxonomy and phylogenetic relationships of these bradybaenid land snail taxa is important both for describing species diversity and for promoting the conservation of these land snails. We investigated the molecular phylogeny of Bradybaena and Phaeohelix using the CO1 and internal transcribed spacer genes, to clarify whether morphological traits and the current species taxonomy of these genera reflect their phylogenetic relationships. Our results show that the Japanese species in these genera are genetically divided into three clades, and the geographical distribution pattern of the lineages tends to reflect phylogenetic relationships. Although the nominal species taxonomy of these genera was not consistent with their molecular phylogenetic relationships, their shell and genital morphology reflected phylogenetic relationships to some extent. Inferred phylogeny and observed genital morphology showed that Phaeohelix submandarina, P. miyakejimana and Bradybaena circulus oceanica from Hachijo-kojima Island belong to P. phaeogramma. In addition, the distinction between Bradybaena and Phaeohelix was not supported by molecular phylogeny, showing instead that Phaeohelix should be synonymized with Bradybaena. This study suggests that a further taxonomic revision of Japanese Bradybaenidae is needed and, to address this issue, genital anatomy is useful in addition to molecular phylogenetic analyses.