| 马舜,石胜超,布点阿依,冯建益,江建平.2023.盐边腹链蛇的补充描述及地理分布更新.动物学杂志,58(4):540-552. |
| 盐边腹链蛇的补充描述及地理分布更新 |
| Supplementary Description on Yanbian Keelback Snake Hebius yanbainensis (Serpentes:Natricidae) and Its Updated Geographical Distributions |
| 投稿时间：2022-11-29 |
| DOI：10.13859/j.cjz.202304007 |
| 中文关键词: 盐边腹链蛇 遗传分化 形态特征 地理分布 |
| 英文关键词:Hebius yanbianensis Genetic differentiation Morphological characters Geographical distribution |
| 基金项目:第二次青藏高原综合科学考察研究项目(No. 2019QZKK05010503，2019QZKK05010203)； |
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| 中文摘要: |
| 盐边腹链蛇(Hebius yanbianensis)由Liu等(2018)依据1号标本而命名，后续文献仅报道了四川盐边县和云南永仁县的各3号标本信息，其形态特征及分布范围都有待进一步研究。本文基于新鉴定的四川标本20号和新采集的云南标本1号，结合已有文献报道的标本7号，对其遗传分化、形态特征及分布范围进行了补充描述。线粒体Cyt b基因序列分子系统关系分析结果显示，盐边腹链蛇的云南宾川种群与四川盐边种群在系统发育树上聚为一支，但它们的遗传距离为1.4%，表明其有一定的遗传分化。盐边腹链蛇不同地理种群的形态特征总体相似，背鳞19-19-17行；在以下特征存在变异：其尾长与体长之比的范围为25.5% ~ 36.2%，腹鳞数为159 ~ 175枚，尾下鳞67 ~ 90对。其在尾长与全长之比、背鳞行数、腹鳞数、尾下鳞数、背部花纹以及腹链有无与分布在中国的其他23种东亚腹链蛇属物种明显区分。盐边腹链蛇已知在其模式产地四川省盐边县以及云南省永仁县分布，本文确定其在四川省米易县、会理市、九龙县以及云南省宾川县亦有分布。研究结果显示，盐边腹链蛇形态特征总体较为稳定，但不同地理种群之间有一定的遗传分化。 |
| 英文摘要: |
| [Objectives] Yanbian Keelback SnakeHebius yanbianensis was described based on one specimen, after then, three specimens from Yanbian County in Sichuan Province and three from Yongren County in Yunnan Province were reported. Owing to the limited information of this species, its genetic differentiation, morphological characters, and distribution require to be further studied. [Methods] Based on 20 specimens newly identified from Sichuan and one newly collected from Yunnan, together with seven specimens mentioned above (Table 1 and Fig. 1), we constructed Maximum Likelihood (ML) and Bayesian Inference (BI) phylogenetic trees inferred from Cyt b gene sequence by IQ-TREE 1.6.12 and MrBayes 3.2.1 respectively, calculated genetic distance by uncorrected p-distance in MEGA 11, and conducted morphological measurements and scales counts.[Results] The result of molecular phylogenetic analysis inferred from Cyt b gene sequence (Table 2) showed that H. yanbianensis from Binchuan in Yunnan and Yanbian in Sichuan clustered into one lineage (SHR 99 / UFB 100 / BI 100) (Fig. 2), but the uncorrected p-distance of 1.4% was recognized between them, which is much lower than the interspecific p-distance between 4.5%﹣14.2% of Hebius (Table 3), indicating intraspecific genetic differentiation. The morphological characters of specimens from different locations are generally similar, but there are some variations:(1) total length (TaL) 48.2﹣83.6 (+) cm, tail length (TL) 12.3﹣21.4 (+) cm, tail length/total length (TL/TaL) 25.5%﹣36.2%; (2) supralabials (SL) usually 8 (7 or 8), infralabials (IL) usually 10 (8﹣11), preoculars (PreO) usually 2 (1﹣3),postoculars (PostO) 3, anterior temporals (aTem) usually 2 (1 or 2); (3) dorsal scales (DSR) 19-19-17, ventral scales (VEN) 159﹣175, subcaudal pairs (SC) 67﹣90; (4) anal 1, divided; (5) maxillary teeth (MT) 23﹣25, the last two distinctly enlarging, without diastema; (6) dark brown or tan on the back, dorsal scales inlaid with bright yellow or red-orange spots or patterns, occasionally individual’s coloration composed discontinuity dorsal stripes or faded; (7) milky white or yellow on the venter, occasionally individuals scattering stain spots, on the outer side of the ventral scale each having large black triangle spots composing strong ventrolateral series (Table 4 and Fig. 3 & 4). It can be distinguished from the other 23 Hebius species distributed in China by tail length/total length, dorsal scale rows, ventral scales, subcaudals, dorsal patterns, and ventrolateral stripe (Table 5). The geographical distribution of H. yanbianensis was found not only at Yanbian and Yongren, but also at Miyi, Huili, and Jiulong in Sichuan and Binchuan in Yunnan (Fig. 1). [Conclusion] This study provides external morphological description and conducts molecular systematics of H. yanbianensis from different populations, revealing that the morphological characters of H. yanbianensis are generally stable, and a certain genetic differentiation exists in different geographic populations. |
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