湖南省发现云开脊蛇兼记棕脊蛇新地模标本

Achalinus yunkaiensis,a New Provincial Record of Hunan Province,China,with Description of an Additional Topotype of A.rufescens

云开脊蛇(Achalinus yunkaiensis)之前仅在广东和广西有分布报道。本文基于形态比较及线粒体COI基因序列分子系统关系分析结果,确定采集于湖南省新宁县的1号雌性脊蛇标本(CIB 119041)为云开脊蛇,为湖南省新记录种。该标本鼻间鳞沟约等于前额鳞沟,上颔齿24枚;背鳞通身23行,腹鳞150枚,尾下鳞55枚;尾长与体长之比为0.203。至此共有4种脊蛇分布于湖南省。此外,本文还报道了棕脊蛇(A.rufescens)1号雄性地模标本(CIB119042),该标本鼻间鳞沟长于前额鳞沟;背鳞通身23行,腹鳞153枚,尾下鳞62枚;尾长与体长之比0.201。分子系统发育结果显示,棕脊蛇种组各支系的系统地位还需进一步研究厘定。

[Objectives]The genus Achalinus is a group of snakes with relatively deficient data.This research provides additional data on this seldom known genus,particularly of the recently described species A.yunkaiensis and the seldom known species A.rufescens.[Methods]The specimen newly reported in this research was identified based on morphological characters and phylogenetic analysis based on cytochrome c oxidase subunit 1(COI).[Results]This study revealed that a specimen of Achalinus snake,CIB 119041,from Xinning County,Hunan Province was A.yunkaiensis,which was a new provincial record of Hunan(Table 1&2;Fig.1&2).The specimen was a female with the following morphological characters:(1)tail length 52 mm,total length 256 mm,tail length/total length 0.203;(2)length of suture between internasals subequal to the suture between prefrontals;(3)supralabials 6,the 4th﹣5th touch the eye;(4)infralabials 6,the first 3 touch the first pair of chin shields;(5)ventral scales 150,subcaudal pairs 55,anal entire;(6)temporals 2+2+3,and the two anterior temporals touch the eye;(7)maxillary teeth 24(Table 3&Fig.3).In addition,a new male topotype of A.rufescens,CIB 119042,was reported from Hongkong with the following characters:(1)tail length 84 mm,total length 418 mm,tail length/total length 0.201;(2)length of suture between internasals longer than the suture between prefrontals;(3)supralabials 6,the 4th﹣5th touch the eye;(4)infralabials 5,the first 3 touch the first pair of chin shields;(5)ventral scales 153,subcaudal pairs 62,anal entire;(6)temporals 2+2+3,and the anterior upper one touch the eye(Table 4,Fig.4).[Conclusions]This study indicated that A.yunkaiensis represents a new reptile record of Hunan Province,which brought the total number of Achalinus species in Hunan Province to four.Furthermore,the results revealed that further taxonomic revisions of A.rufescens complex are needed.