Idiiatullina Sabira S, Nguyen Tan VAN, Bragin Andrey M, Pawangkhanant Parinya, LE Dac Xuan, Vogel Gernot, David Patrick, Poyarkov Nikolay A
Department of Vertebrate Zoology; Lomonosov Moscow State University; Leninskiye Gory; GSP-1; Moscow 119991; Russia.
Institute for Research and Training in Medicine; Biology and Pharmacy; Duy Tan University; Da Nang; 550000; Vietnam; College of Medicine and Pharmacy; Duy Tan University; 120 Hoang Minh Thao; Lien Chieu; Da Nang; 550000; Vietnam; Joint Vietnam - Russia Tropical Science and Technology Research Center; Nghia Do; Cau Giay; Hanoi; Vietnam.
Zootaxa. 2024 Jul 1;5474(4):375-411. doi: 10.11646/zootaxa.5474.4.3.
We describe a new species of green pitviper from southern and central parts of coastal Vietnam based on morphological and molecular (2406 bp from cyt b, ND4, and 16S rRNA mitochondrial DNA genes) lines of evidence. Trimeresurus cyanolabris sp. nov. is distinguished from its congeners by the combination of the following morphological characters: small size, maximum known SVL of 638 mm; dorsal scales in 21 (rarely 23)-21-15 rows, moderately keeled except the outermost rows; ventral scales 166-178; subcaudal scales 52-75, all paired; hemipenis forked, calyculate, reaching the 8th subcaudal; eye bright yellow in both sexes; dorsal surface deep green lacking cross-bands; postocular white stripe missing in both sexes; ventrolateral stripe faintly present on the first few dorsal scale rows in males, absent in females; throat, chin, and lower labials in shades of blue. The new species forms a distinct clade on the phylogenetic tree of the genus Trimeresurus and differs from the morphologically similar T. rubeus by a significant divergence in cytochrome b mitochondrial DNA gene sequences (p = 6.0%). The new species is currently known from low- to mid-elevations (ca. 90-400 m a.s.l.) in tropical forests of central-southern Vietnam. This discovery further underlines the importance of this area as a local center of herpetofaunal diversity and endemism, which is under great threat of deforestation.
我们基于形态学和分子学证据（来自细胞色素b、ND4和16S rRNA线粒体DNA基因的2406个碱基对）描述了一种来自越南沿海中部和南部地区的新型绿蝮蛇。新物种蓝唇竹叶青（Trimeresurus cyanolabris sp. nov.）因其以下形态特征组合而与同属其他物种相区别：体型小，已知最大体长（SVL）为638毫米；背鳞21（很少为23）-21-15行，除最外侧几行外具适度棱嵴；腹鳞166-178枚；尾下鳞52-75枚，均成对；半阴茎分叉，具小窝，可达第8枚尾下鳞；两性眼睛均为亮黄色；背面深绿色，无横纹；两性均无眼后白色条纹；雄性在最初几排背鳞上有隐约可见的腹侧条纹，雌性无；喉部、颏部和下唇为蓝色调。新物种在竹叶青属的系统发育树上形成一个独特的分支，并且在细胞色素b线粒体DNA基因序列上与形态相似的红竹叶青（T. rubeus）有显著差异（p = 6.0%）。新物种目前已知分布于越南中南部热带森林的低海拔至中海拔地区（海拔约90-400米）。这一发现进一步凸显了该地区作为一个爬行动物多样性和特有性的本地中心的重要性，而该地区正面临着森林砍伐的巨大威胁。
