云南省两种兽类新纪录——藏鼩鼱(Sorex thibetanus Kastschenko,1905)和甘肃鼩鼱(Sorex cansulus Thomas,1912)

目前对藏鼩鼱（Sorex thibetanus）和甘肃鼩鼱（Sorex cansulus）的分布范围和生物学资料了解较少。2017年，在云南省西北部的高山区域采集了48号鼩鼱属（Sorex）动物标本。用形态学和基于Cyt b基因的分子系统学对采集标本进行了物种鉴定。结果显示来自4个地点的27号标本形态上与藏鼩鼱相符，来自2个地点的21号标本与甘肃鼩鼱相似，但存在一定差异。基于Kimura-2-parameter的遗传距离显示，藏鼩鼱组内遗传距离为0.46%，甘肃鼩鼱组内遗传距离为0.42%。它们与其它鼩鼱属物种的组间遗传距离分别为10.76%~17.04%和6.59%~14.52%。最大似然（Maximum likelihood）树结果显示，来自云南省西北部的两种鼩鼱动物分别与藏鼩鼱（BS=71%）和甘肃鼩鼱（BS=100%）构成单系。上述结果支持这两种鼩鼱属动物分别为藏鼩鼱和甘肃鼩鼱，均为云南省兽类新纪录。

New records of Tibetan shrew(Sorex thibetanus Kastschenko,1905) and Gansu shrew(Sorex cansulus Thomas,1912) in Yunnan Province

Tibetan shrew(Sorex thibetanus) and Gansu shrew(Sorex cansulus) are two poorly known species of the genus Sorex. In 2017, 48 specimens of Sorex were collected in alpine areas of north-west Yunnan. The morphological characteristics and measurements of these specimens were compared with previous specimen records, and their phylogenetic relationships with other Sorex species were assessed based on Cyt b gene. Results show that 27 specimens from 4 sites are morphologically similar to S. thibetanus, while other 21 specimens from 2 sites are morphologically similar to S. cansulus, although with considerable differences. The intraspecific Kimura-2-parameter distance based on Cyt b was 0.46% for S. thibetanus and 0.42% for S. cansulus, while the distances between these two species to other Sorex species were 10.76%-17.04% and 6.59%-14.52%, respectively. Maximum likelihood phylogenetic analyses support the two species are monophyletic to S. thibetanus(BS=71%) and S. cansulus (BS=100%), which both are new mammal records in Yunnan Province.