中国拟家鼠分类与分布厘订

Taxonomic and distribution revision of Rattus pyctoris in China

拟家鼠(Rattus pyctoris)由Hodgson在1845年命名,其模式产地为尼泊尔。该种的分类地位和是否在中国有分布都存在较大争议。近来有研究认为拟家鼠不分布于我国。2020年,在西藏吉隆县和札达县进行野外调查时采集到7号标本,皮毛、头骨和牙齿的形态特征与尼泊尔的拟家鼠相似,分子系统发育分析支持这些标本为单系(PP=1.0),与模式产地样品Cyt b基因的K2-P遗传距离为0~2.8%,确认这些标本为拟家鼠。这是第一次在我国境内采集到拟家鼠标本,丰富和完善了这个物种的生物地理资料。

The Himalayan rat(Rattus pyctoris)was named by Hodgson in 1845,and its type locality is Nepal.The taxonomic status of this species and its distribution in China is controversial.Some research suggested that Rattus pyctoris is not distributed in China.Recently,seven specimens of Rattus sp.were collected during a field survey in 2020 from Jilong and Zanda counties,Tibet,China.The Pelage,skull,and teeth morphologies of these specimens resemble Rattus pyctoris from Nepal.Bayesian phylogenetic inference supported these specimens are monophyletic(PP=1.0).The Kimura 2-parameter model(K2-P)genetic distance of Cyt b gene between our collections and the topotype of R.pyctoris is less than 2.8%.Thus,these specimens are suggested as Rattus pyctoris based on morphological and molecular evidence.This is the first record of Rattus pyctoris in China,the finding has enriched the biogeographic data of this species.