This study reassesses the taxonomic status of the Malayan water shrew, Chimarrogale hantu Harrison 1958 as a distinct species and reclassifies it as the genus Crossogale through genetic and morphological analyses. We construct phylogenetic trees using both mitochondrial (cyt b) and nuclear markers (ApoB and RAG2). Chimarrogale hantu formed a distinct clade that diverged from other Chimarrogale species and other genera in the tribe Nectogalini (Nectogale, Neomys, Pseudosoriculus, Episoriculus, Chodsigoa, and Soriculus clades). The C. hantu clade is closely related to the Bornean water shrew, Crossogale phaeura with a K2P genetic distance of 7%. High K2P genetic distance (> 15% K2P) was also observed when compared to other Chimarrogale species (C. platycephalus, C. himalayica, C. styani, C. varennei and C. leander) as well as other genera from the tribe Nectogalini (> 20% K2P). We proved that C. hantu genetically and morphologically merits species rank. We suggest classifying C. hantu in the genus Crossogale along with Cr. phaeura, while the rest of the Asiatic shrews remain in the genus Chimarrogale. Future comprehensive reviews of the Sundaic water shrew group should include Chimarrogale sumatrana from Sumatra, Indonesia, for a comprehensive understanding on the relationship of water shrews between Sundaland and the rest of the Asiatic region.

中文翻译：

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马来亚水鼩的分类评估 Chimarrogale hantu Harrison, 1958 和重新分类为 Crossogale 属

本研究重新评估了马来亚水鼩的分类地位，Chimarrogale hantu Harrison 1958 作为一个独特的物种，并通过遗传和形态分析将其重新分类为 Crossogale 属。我们使用线粒体 (cyt b) 和核标记（ApoB 和 RAG2）构建系统发育树。Chimarrogale hantu 形成了一个独特的进化枝，该进化枝与 Nectogalini 部落中的其他 Chimarrogale 物种和其他属（Nectogale、Neomys、Pseudosoriculus、Episoriculus、Chodsigoa 和 Soriculus clades）不同。C. hantu 进化枝与婆罗洲水鼩 (Crossogale phaeura) 密切相关，K2P 遗传距离为 7%。与其他 Chimarrogale 物种（C. platycephalus、C. himalayica、C. styani、C. varennei 和 C. Leander）以及来自部落 Nectogalini 的其他属（> 20% K2P）。我们证明了 C. hantu 在遗传和形态上的优势物种等级。我们建议将 C. hantu 与 Cr 一起归入 Crossogale 属。phaeura，而其余的亚洲鼩鼱仍属于 Chimarrogale 属。Sundaic水鼩组未来的综合审查应包括来自印度尼西亚苏门答腊的Chimarrogale sumatrana，以全面了解巽他与亚洲其他地区之间水鼩的关系。