摘要
2011年7月,在重庆市秀山土家族苗族自治县采集到1号蛇类标本,初定为山溪后棱蛇(Opisthotropis latouchii)。后整理发现,该标本鳞片排列特征与赵氏后棱蛇(O.zhaoermii)及莽山后棱蛇(O.cheni)的形态相符,但体色与莽山后棱蛇存在显著差异。为进一步确定其分类地位,利用线粒体细胞色素b基因片段构建系统发育树进行分子遗传分析。结果显示,该蛇与赵氏后棱蛇形成单系群(p-distance不超过0.01%),而与莽山后棱蛇构成姊妹群(p-distance为5.1%)。综合形态特征比较和分子系统发育证据,最终确定该标本为水游蛇科(Natricidae)后棱蛇属的赵氏后棱蛇,系重庆市蛇类分布新记录种。本发现不仅拓展了赵氏后棱蛇的已知分布范围,也为进一步解决山溪后棱蛇种组的分类及分布问题提供了基础数据。
Opisthotropis zhaoermii is a natricid snake species originally described from western Hunan Province,China and subsequently recorded in eastern Guizhou Province.In July 2011,an adult female snake specimen(YBU 11260;total length 363 mm,snout-vent length 287 mm,tail length 76 mm)was collected from Xiushan,Chongqing,China(108°55′44″E,28°16′29″N,588 m a.s.l.).Morphological examination revealed diagnostic characteristics consistent with O.zhaoermii,including a dark olive-green dorsal surface with yellowish-white longitudinal stripes,an ivory-yellow ventral surface with asymmetrical speckles laterally;subcaudals edged with dark pigmentation forming continuous longitudinal stripes,142 ventral scales,and 28 maxillary teeth on both sides(Fig.1).Molecular phylogenetic analysis based on mitochondrial cytochrome b(Cyt b)gene sequences demonstrated minimal genetic divergence(p-distance≤0.01%,Bayesian posterior probability 0.96),further confirming it as O.zhaoermii(Fig.2).This specimen represents the first confirmed record of O.zhaoermii in Chongqing,significantly extending its known distributional range westward beyond previously recorded localities in Hunan and Guizhou provinces.This discovery provides critical baseline data for resolving taxonomic and biogeographical questions concerning the O.latouchii species complex.
作者
李科
詹雨洋
郭鹏
唐梓钧
吴亚勇
舒服
LI Ke;ZHAN Yu-Yang;GUO Peng;TANG Zi-Jun;WU Ya-Yong;SHU Fu(School of Ecology and Nature Conservation,Beijing Forestry University,Beijing 100083;Faculty of Agriculture,Forest and Food Engineering,Yibin University,Yibin 644007;Central South Academy of Inventory and Planning of National Forestry and Grassland Administration,Changsha 410014,China)
出处
《动物学杂志》
北大核心
2025年第5期759-765,共7页
Chinese Journal of Zoology
基金
宜宾学院科研启动项目(No.2019QD13)。
关键词
赵氏后棱蛇
重庆
新记录
形态比较
系统发育关系
Opisthotropis zhaoermii
Chongqing
New record
Morphological comparison
Phylogeny
