【摘要】 2020年8月在贵州省普安县（25°47′02″N,105°01′07″E，海拔1 636 m）采集到3号蛇类标本。它们在形态上与昆明钝头蛇（Pareas niger）相似。基于线粒体细胞色素b(Cytb)基因序列构建的系统发育树显示，此次采集的钝头蛇标本与昆明钝头蛇的1号地模标本序列聚为一支，它们之间的遗传距离为0.4%，远小于钝头蛇属物种之间的遗传距离（5.60%～23.90%）。综合形态比较和分子系统发育分析结果，确定此次采集到的钝头蛇标本为昆明钝头蛇，为贵州省爬行动物分布新记录种。更多还原

【Abstract】 Three snake specimens were collected in Pu’an County, Guizhou Province in August 2020. The specimens resemble Pareas niger based on morphological comparisons. The phylogenetic trees constructed based on the mitochondrial cytochrome b(Cyt b) gene sequences show that the newly collected specimens are clustered closely with a topotype of P. niger(Kunming, Yunnan)(Fig. 2), and the genetic distance between them is 0.4%, which is much smaller than interspecific genetic distance of Pareas(5.60%-23.90%).According to morphological comparisons and molecular phylogenetic results, the newly collected specimens should be P. niger, which is a new record of reptiles in Guizhou Province.更多还原