贵州六盘水发现褐腹长尾鼩鼱滇西亚种(Episoriculus caudatus umbrinus)  

Episoriculus caudatus umbrinus Found in Liupanshui,Guizhou Province,China

作　　者：刘铸[1] 赵婧瑜 赵鑫旭 张玉红 田新民[1,2] 蔡赫[1] 陈欢[1] 张隽晟[1] LIU Zhu;ZHAO Jing-Yu;ZHAO Xin-Xu;ZHANG Yu-Hong;TIAN Xin-Min;CAI He;CHEN Huan;ZHANG Jun-Sheng(College of Life Science and Technology,Mudanjiang Normal University,Mudanjiang 157011;College of Wildlife and Protected Area,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]牡丹江师范学院生命科学与技术学院,牡丹江157011 [2]东北林业大学野生动物与自然保护地学院,哈尔滨150040

出　　处：《动物学杂志》2022年第4期612-619,共8页Chinese Journal of Zoology

基　　金：黑龙江省自然科学基金项目(No.LH2021C095);黑龙江省省属高等学校基本科研业务费科研项目(No.1355JG002,1451TD002,1451PT008)。

摘　　要：在贵州省六盘水市杨梅乡慕尼克村,利用陷阱法捕捉到褐腹长尾鼩鼱滇西亚种(Episoriculus caudatus umbrinus)雌性2号。本次采集的标本体型较小,头体长分别为57.2 mm和50.4 mm,尾长(53.2 mm和46.7 mm)略短于头体长。尾部背腹色差较小,腹面略呈现褐色。后足长分别为11.9 mm和12.4 mm。颅全长17.28 mm和17.23 mm,上颌骨较宽(5.02 mm和4.96 mm)与腭齿长(7.72 mm和7.56 mm)之比为65.31%。上门齿1枚,上单尖齿4枚,第1单尖齿和第2单尖齿大小近似,明显大于第3单尖齿,第4单尖齿微小,着生于第3单尖齿和前臼齿缝隙内侧。上颌1枚前臼齿,3枚臼齿,第3枚臼齿小。利用已报道的长尾亚洲鼩属检索表进行检索,鉴定上述采集物种为褐腹长尾鼩鼱滇西亚种。基于Cyt b基因全序列(1140 bp),采集标本与长尾亚洲鼩属中的褐腹长尾鼩鼱滇西亚种遗传距离最近,在0.030~0.062之间。系统发生树也显示,2号标本与褐腹长尾鼩鼱滇西亚种构成一个单系进化分支,进一步证实本次采集2号标本是褐腹长尾鼩鼱滇西亚种。Two female specimens were trapped by the pitfall trap method in Munike Village,Yangmei Township,Liupanshui City,Guizhou Province,China.This discovery will expand our knowledge about the geographic distribution of Episoriculus.Morphological characterization,and measurements about external and cranial features were used in morphological studies.Genetic distances were calculated and phylogenetic tree was constructed based on the complete sequence of mtDNA Cyt b gene(1140 bp)in molecular biology research(Table 1).The head and body length of the two specimens are 57.2 mm and 50.4 mm,with their tail lengths(53.2 mm and 46.7 mm)slightly shorter than the head and body lengths.There is little color difference between the back and the ventral surface of the tail,and the ventral surface is slightly brown.Hind feet length is 11.9 mm and 12.4 mm.Condyloincisive length is 17.28 mm and 17.23 mm.Maxillary breadth is 5.02 mm and 4.96 mm.Maxillary breadth to palatoincisive length(7.72 mm and 7.56 mm)is 65.31%(Table 2).There are 1 upper incisor and 4 upper unicuspid teeth.The first and the second unicuspid tooth are similar in size,significantly larger than the third unicuspid tooth.The fourth unicuspid tooth is very tiny,and inserted in the inner side of the gap between the third unicuspid tooth and the premolar tooth.There are 1 premolar and 3 molars in the maxillary,and the third molar is smaller.There are 1 incisor,1 unicuspid,1 premolar and 3 molars in the mandible.Based indentification on key to Episoriculus,the specimens collected are determined as E.caudatus umbrinus.The genetic distances between E.c.umbrinus specimen recorded and our specimens were the nearest between 0.030 and 0.062,based on mitochondrial cytochrome b gene.It was shown that our specimen lay in a monophyletic clade together with E.c.umbrinus in the phylogenetic tree,further confirming our identification.Phylogenetic Bayesian tree of the genus Episoriculus shows that E.c.umbrinus has the closest relationship of phylogeny with E.sacratus,followed by E.c.caud

关 键 词：鼩形目 褐腹长尾鼩鼱滇西亚种 贵州省 分布新记录种 

分 类 号：Q959[生物学—动物学]