Luu Vinh Quang, Ziegler Thomas, VAN Ha Nghia, VAN Lo Oanh, Hoang Tuoi Thi, Ngo Hanh Thi, LE Minh Duc, Tran Dung Hoang, Nguyen Truong Quang
-1Faculty of Forest Resources and Environmental Management, Vietnam National University of Forestry, Xuan Mai, Chuong My, Hanoi, Vietnam..
Zootaxa. 2020 Nov 9;4877(1):zootaxa.4877.1.8. doi: 10.11646/zootaxa.4877.1.8.
We describe a new snake of the genus Achalinus based on an adult female specimen from Ninh Binh Province, Vietnam. Achalinus tranganensis sp. nov. is differentiated from its congeners genetically and by a unique combination of the following characters: 1) maxillary teeth 29; 2) suture between the internasals distinctly longer than that between the prefrontals; 3) loreal distinctly wider than high, extending from the nasal to the eye; 4) dorsal scales in 25-23-23 rows, keeled; 5) two pairs of prefrontals; 6) supralabials six; 7) infralabials six; 8) temporals 2+3, the two anterior temporals in contact with eye; 9) ventrals 171; 10) subcaudals 73+, unpaired; 11) cloacal plate entire; 12) dorsum in preservative reddish to greyish brown above; 13) the lower part of head side and chin region somewhat paler than the dorsum; 14) venter greyish cream, with the anterior region of each ventral and subcaudal somewhat darker. Based on molecular comparisons using a fragment of the mitochondrial cytochrome c oxidase subunit I (COI), the new species differs from other members of the genus by at least 11.8%. This discovery increases the number of Achalinus species known from Vietnam to seven.
我们基于采自越南宁平省的一具成年雌性标本描述了脊蛇属的一种新蛇类。宁平脊蛇（Achalinus tranganensis sp. nov.）在基因上以及通过以下独特的特征组合与同属其他物种相区分：1）上颌齿29枚；2）鼻间骨缝明显长于额前骨缝；3）眶下鳞明显宽大于高，从鼻鳞延伸至眼；4）背鳞25 - 23 - 23行，具棱；5）两对额前骨；6）上唇鳞6枚；7）下唇鳞6枚；8）颞鳞2 + 3，前两枚颞鳞与眼相接；9）腹鳞171枚；10）尾下鳞73枚以上，不成对；11）泄殖板完整；12）保存状态下背面为红棕色至灰棕色；13）头侧下部和颏部区域比背面略淡；14）腹面为灰米色，每枚腹鳞和尾下鳞的前部区域颜色略深。基于使用线粒体细胞色素c氧化酶亚基I（COI）片段进行的分子比较，该新物种与同属其他成员的差异至少为11.8%。这一发现使越南已知的脊蛇属物种数量增加到7种。
