Motokawa Masaharu, Harada Masashi, Mekada Kazuyuki, Shrestha Krishna C
The Kyoto University Museum, Kyoto, Japan Laboratory Animal Center, Graduate School of Medicine, Osaka City University, Osaka, Japan Experimental Animal Division, RIKEN BioResource Center, Tsukuba, Ibaraki, Japan Department of Zoology, Pri-Chandra Campus, Katmandu, Nepal.
Integr Zool. 2008 Sep;3(3):180-5. doi: 10.1111/j.1749-4877.2008.00097.x.
The karyotypes of three shrew species (Mammalia, Soricomorpha, Soricidae) from Nepal were examined for the first time. Based on the karyotypes and overall differences in skull size, the current Episoriculus caudatus appeared to include two distinct species: the larger E. caudatus and the smaller Episoriculus sacratus. Episoriculus sacratus has three subspecies, E. s. soluensis in Nepal and Sikkim, E. s. umbrinus in Assam, Myanmar and the Yunnan Province of China, and E. s. sacratus in the Sichuan Province of China. Soriculus nigrescens had a diploid chromosome number (2n) and fundamental number (FN), including two X chromosomes, of 64 and 92, respectively, consisting of 11 metacentric or submetacentric, two subtelocentric and 18 acrocentric pairs of autosomes, a metacentric X and an acrocentric Y chromosome. Episoriculus sacratus soluensis had 2n = 74 and FN = 126, consisting of 12 metacentric or submetacentric, 13 subtelocentric and 11 acrocentric pairs of autosomes, a submetacentric X and an acrocentric Y chromosome. Episoriculus caudatus had 2n = 60 and FN = 118, consisting of 19 metacentric or submetacentric, nine subtelocentric and one acrocentric pair of autosomes, a subtelocentric X and an acrocentric Y chromosome. The karyotypes of these three species are characterized by their large 2n and FN values compared with other Soricidae.
首次对来自尼泊尔的三种鼩鼱物种（哺乳纲，鼩形目，鼩鼱科）的核型进行了研究。基于核型和头骨大小的整体差异，目前的长尾鼩似乎包括两个不同的物种：体型较大的长尾鼩和体型较小的锡金长尾鼩。锡金长尾鼩有三个亚种，尼泊尔和锡金的苏卢长尾鼩、阿萨姆邦、缅甸和中国云南省的暗褐长尾鼩以及中国四川省的锡金长尾鼩。黑齿鼩的二倍体染色体数（2n）和包括两条X染色体在内的染色体基数（FN）分别为64和92，由11对中着丝粒或亚中着丝粒染色体、2对近端着丝粒染色体和18对端着丝粒常染色体、1条中着丝粒X染色体和1条端着丝粒Y染色体组成。苏卢长尾鼩的2n = 74，FN = 126，由12对中着丝粒或亚中着丝粒染色体、13对近端着丝粒染色体和11对端着丝粒常染色体、1条亚中着丝粒X染色体和1条端着丝粒Y染色体组成。长尾鼩的2n = 60，FN = 118，由19对中着丝粒或亚中着丝粒染色体、9对近端着丝粒染色体和1对端着丝粒常染色体、1条近端着丝粒X染色体和1条端着丝粒Y染色体组成。与其他鼩鼱科动物相比，这三个物种的核型特点是2n和FN值较大。
