biostudies-literatureUnknown14Zhao S<h4>Background</h4>The Tam Dao Mountain Stream Keelback, <i>Opisthotropis tamdaoensis</i> Ziegler, David & Vu, 2008, was previously described, based on one single holotype and subsequently expanded according to four newly-collected specimens from the type locality. Information on this species is extremely limited.<h4>New information</h4>On the basis of newly-collected <i>Opisthotropis</i> specimens from Hekou, Yunnan, China, this study reports the first country record of <i>Opisthotropis tamdaoensis</i> from China. The Chinese <i>Opisthotropis tamdaoensis</i> population totally agrees with the original description of this species and revealed only a minor genetic distance (lower than 2.9%) in the mitochondrial gene fragment of the cytochrome <i>b</i> (<i>Cytb</i>) compared with the topotypBiodiversity data journale181301https://www.ebi.ac.uk/biostudies/studies/S-EPMC12828335biostudies-literatureExpanded description and distribution of &lt;i&gt;Opisthotropis tamdaoensis&lt;/i&gt; Ziegler, David &amp; Vu, 2008 (Squamata, Natricidae), first record from Yunnan Province of China.PMC12828335Cai BMa SGuo KZhao SZhou WZhang LLiu SOu DfalseExpanded description and distribution of &lt;i&gt;Opisthotropis tamdaoensis&lt;/i&gt; Ziegler, David &amp; Vu, 2008 (Squamata, Natricidae), first record from Yunnan Province of China.<h4>Background</h4>The Tam Dao Mountain Stream Keelback, <i>Opisthotropis tamdaoensis</i> Ziegler, David & Vu, 2008, was previously described, based on one single holotype and subsequently expanded according to four newly-collected specimens from the type locality. Information on this species is extremely limited.<h4>New information</h4>On the basis of newly-collected <i>Opisthotropis</i> specimens from Hekou, Yunnan, China, this study reports the first country record of <i>Opisthotropis tamdaoensis</i> from China. The Chinese <i>Opisthotropis tamdaoensis</i> population totally agrees with the original description of this species and revealed only a minor genetic distance (lower than 2.9%) in the mitochondrial gene fragment of the cytochrome <i>b</i> (<i>Cytb</i>) compared with the topotyp2026-01-01T00:00:00Z20262026-06-13T03:18:52.033Z2026-06-13T03:09:17.888ZS-EPMC128283354158421010.3897/BDJ.14.e181301