四川省雷波县发现紫沙蛇

A Snake New to Sichuan Province,China:Psammodynastes pulverulentus

2020年7月,在四川省凉山彝族自治州雷波县采集到1号蛇类标本,基于形态比较和线粒体细胞色素b(Cyt b)基因序列重建的分子系统关系,确定该标本为屋蛇科(Lamprophiidae)紫沙蛇属(Psammodynastes)的紫沙蛇(P.pulverulentus),系四川省蛇类分布新记录种。基于Cyt b基因序列计算的遗传距离显示,来自四川、广西、广东、云南、海南、福建、纳米比亚的紫沙蛇个体之间遗传距离为3.6%~9.9%,差异较大,其种下关系亟待进一步研究和厘定。

An unidentified snake was collected at a freshly reclaimed hillside in Qianwanguan Township,Leibo County,Sichuan Province(103°50′E,28°15′N)during a reptile diversity survey in Sichuan Province in late July 2020.We conducted Bayesian and maximum likelihood phylogenetic analyses basis on a mitochondrial cytochrome b(Cyt b)DNA sequence to ascertain the phylogenetic position of this specimen(p-distance≥3.6%).Furthermore,the newly specimen can be diagnosed as Psammodynastes pulverulentus by a combination of pholidosis characters,which is the new snakes fauna in Sichuan Province.On the basis of 17 individuals of P.pulverulentus from Sichuan,Guangxi,Guangdong,Yunnan,Hainan and Namibia,we recognize for the first time a complex intraspecific phylogeny of P.pulverulentus,and to better solve this issue,more detailed samples and more markers are needed.