| 徐宇浩,龚宴安,田胜尼,朱毅武,杨典成,黄汝怡.2023.贵州荔波发现锦白环蛇.动物学杂志,58(6):954-960. |
| 贵州荔波发现锦白环蛇 |
| Lycodon pictus Found in Libo County, Guizhou Province |
| 投稿时间：2022-12-30 |
| DOI：10.13859/j.cjz.202322333 |
| 中文关键词: 贵州省 锦白环蛇 新记录种 |
| 英文关键词:Lycodon pictus Guizhou Province New record |
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| 中文摘要: |
| 2021年9月，在贵州省黔南布依族苗族自治州荔波县黎明关水族乡采集到一雌一雄2号白环蛇属(Lycodon)物种个体，两个体具有以下形态学特征：背鳞17-17-15行，光滑；上唇鳞8枚，下唇鳞10枚；颊鳞1枚，入眶；眶前鳞1枚，眶后鳞2枚；颞鳞8枚，2 + 3 + 3排列；腹鳞209 ~ 213枚(+ 1或2枚前腹鳞)，雄性尾下鳞90对，雌性标本尾末端缺损，肛鳞完整。活体背面棕黑色，雄性体背部具29条浅色环，尾背部具12条浅色环，雌性体背部具30条浅色环，尾背部具10条浅色环。2号标本与锦白环蛇(L. pictus)原始描述中提供的形态学鉴定依据相符。线粒体Cyt b基因序列分析显示，本次采集的标本与已知锦白环蛇样本的遗传距离在0.3% ~ 0.8%之间。综合形态特征和系统发育分析比较，鉴定此次采集的白环蛇属标本为锦白环蛇，为贵州爬行动物分布新记录种。 |
| 英文摘要: |
| Lycodon pictus was described from Cao Bang Province, Northern Vietnam by Janssen et al. 2019. In 2020, it was confirmed to have a distribution in Nonggang National Nature Reserve, Longzhou County, Guangxi Zhuang Autonomous Region, China, which is the first recorded from China. In September 2021, two snake specimens (one male and one female) of the genus Lycodon were collected in Libo County, Qiannan Buyi and Miao Autonomous Prefecture, Guizhou Province, China (25°14′3″ N, 107°55′32″ E, altitude 530 m) during a field survey. Based on the morphological comparison and phylogenetic analyses, the collected specimens of the genus Lycodon were identified as L. pictus,which is a new record to Guizhou Province. The specimens were fixed in 10% formalin for one day, subsequently kept permanently in 75% ethanol, and deposited in Anhui Normal University Museum (ANUM). The fresh liver tissue was extracted and immediately preserved in 95% ethanol. 31 sequences of 18 recognized species of genus Lycodon and2 outgroups (Boiga cynodon, Dipsadoboa flavida) were downloaded from GenBank (Accession numbers listed in Fig. 2). Uncorrected pairwise distances (p-distance) among closely related congeners were calculated in MEGA X software. Phylogenetic tree was constructed by maximum likelihood (ML) in RaxML 7.2.6 software. After external morphological (Fig. 1) and morphometric measurements (Table 1) examination, the specimens from Libo County were similar to Lycodon pictus. Molecular phylogenetic analyses revealed that the uncorrected pairwise distances (p-distance) between the two collected specimens and L. pictus were from 0.3% to 0.8% (Table 2). The new distribution site of L. pictus in Libo, Guizhou, China is approximately 350 km away from the type locality in Vietnam. The new discovery in the present study expands the distribution area of L. pictus, and it also enriches the species diversity of the genus Lycodon in Guizhou Province. |
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