taxonID	type	description	language	source
F647EBFB1331588AB4AF3C13533B53D4.taxon	materials_examined	Specimens examined (N = 1). SYS a 000537, adult female, collected by Qing Du and Jian-Huan Yang on 10 July 2009 from Shiwandashan Nature Reserve [exact coordinates not provided owing to threat from collection for the pet trade], Shangsi County, Qinzhou City, Guangxi Zhuang Autonomous Region, 493 m a. s. l., P. R. China.	en	Wang, Jian, Lyu, Zhi-Tong, Zeng, Zhao-Chi, Lin, Chao-Yu, Yang, Jian-Huan, Nguyen, Truong Quang, Le, Minh D., Ziegler, Thomas, Wang, Ying-Yong (2020): Re-examination of the Chinese record of Opisthotropis maculosa (Squamata, Natricidae), resulting in the first national record of O. haihaensis and description of a new species. ZooKeys 913: 141-159, DOI: http://dx.doi.org/10.3897/zookeys.913.48622, URL: http://dx.doi.org/10.3897/zookeys.913.48622
F647EBFB1331588AB4AF3C13533B53D4.taxon	etymology	Etymology. According to the original description, the specific name " haihaensis " refers to the type locality of this species, Haiha District (Quang Ninh Province) in Vietnam. As this species is currently reported in China, we suggest its Chinese name " Hai He Hou Leng She (海河后棱蛇) ", derived from its scientific name.	en	Wang, Jian, Lyu, Zhi-Tong, Zeng, Zhao-Chi, Lin, Chao-Yu, Yang, Jian-Huan, Nguyen, Truong Quang, Le, Minh D., Ziegler, Thomas, Wang, Ying-Yong (2020): Re-examination of the Chinese record of Opisthotropis maculosa (Squamata, Natricidae), resulting in the first national record of O. haihaensis and description of a new species. ZooKeys 913: 141-159, DOI: http://dx.doi.org/10.3897/zookeys.913.48622, URL: http://dx.doi.org/10.3897/zookeys.913.48622
F647EBFB1331588AB4AF3C13533B53D4.taxon	distribution	Distribution and habits. Opisthotropis haihaensis is currently known from its type locality, the forest near Tai Chi Village (ca 950 m a. s. l.), Quang Ninh, northern Vietnam, and Shiwandashan Nature Reserve (ca 500 m a. s. l.), southwestern Guangxi, southern China. The straight-line distance between the two localities is approximately 150 kilometers, indicating that the distribution area of this species is the mountain region on the border between China and Vietnam. The holotype was found at night in a small rocky stream at 21: 30 h. The surrounding habitat was secondary evergreen forest consisting of small hardwoods, bamboo, and shrubs. The air temperature was 24 - 29 ° C and the relative humidity was 65 - 88 %. The holotype revealed to be an adult female, as dissection showed up to 16.5 mm long eggs and the oviducts were folded, indicating that eggs had already been laid (Ziegler et al. 2019). Besides, the other specimen, SYS r 000537, was collected from a rocky stream (about 8 m wide and 0.3 m deep at the collecting site) running through well-preserved, dense deciduous forests. The collected individual was spotted swimming at night and swiftly hiding under stones when disturbed.	en	Wang, Jian, Lyu, Zhi-Tong, Zeng, Zhao-Chi, Lin, Chao-Yu, Yang, Jian-Huan, Nguyen, Truong Quang, Le, Minh D., Ziegler, Thomas, Wang, Ying-Yong (2020): Re-examination of the Chinese record of Opisthotropis maculosa (Squamata, Natricidae), resulting in the first national record of O. haihaensis and description of a new species. ZooKeys 913: 141-159, DOI: http://dx.doi.org/10.3897/zookeys.913.48622, URL: http://dx.doi.org/10.3897/zookeys.913.48622
5476E9250F415D7291AB8EC4480C8DB9.taxon	etymology	Etymology. The species name " hungtai " refers to Professor Hung-Ta Chang (= Hong-Da Zhang, 张宏达), an outstanding botanist, who established the Tropical and Subtropical Forest Ecosystem Experimental Center in Heishiding Nature Reserve, promoting the development of ecological research in southern China. We suggest the English common name Hung-Ta Chang's mountain Keelback and the Chinese name Zhang Shi Hou Leng She (张氏后棱蛇).	en	Wang, Jian, Lyu, Zhi-Tong, Zeng, Zhao-Chi, Lin, Chao-Yu, Yang, Jian-Huan, Nguyen, Truong Quang, Le, Minh D., Ziegler, Thomas, Wang, Ying-Yong (2020): Re-examination of the Chinese record of Opisthotropis maculosa (Squamata, Natricidae), resulting in the first national record of O. haihaensis and description of a new species. ZooKeys 913: 141-159, DOI: http://dx.doi.org/10.3897/zookeys.913.48622, URL: http://dx.doi.org/10.3897/zookeys.913.48622
5476E9250F415D7291AB8EC4480C8DB9.taxon	diagnosis	Diagnosis. Opisthotropis hungtai sp. nov. is characterized by the following combination of characters: (1) TL 464.3 - 501.2 mm in adult males, 393.2 - 511 mm in females, (2) tail moderate, TaL / TL 0.20 - 0.26 in males, 0.19 - 0.22 in females, (3) internasal not in contact with loreal, prefrontal not touching supraocular, frontal touching preocular, (4) one preocular, one or two postocular (s), (5) temporals 1 + 1, (6) supralabials seven, the fourth and fifth in contact with eye; (6) maxillary teeth 16 - 18, (7) anterior pair of chin shields longer than or equal to posterior pair; (8) ventrals 170 - 189 (+ 2 preventrals) in males, 168 - 175 (+ 2 preventrals) in females, (9) subcaudals 76 - 98 in males, 69 - 84 in females, (9) nasal cleft pointing to the second supralabial, (10) body scale in 15 - 15 - 15 rows, (11) body scales smooth, tail scales smooth or indistinctly keeled, (12) chin shields yellow with brownish black mottling, and (13) body and tail dorsum dark, each with a light spot per scale.	en	Wang, Jian, Lyu, Zhi-Tong, Zeng, Zhao-Chi, Lin, Chao-Yu, Yang, Jian-Huan, Nguyen, Truong Quang, Le, Minh D., Ziegler, Thomas, Wang, Ying-Yong (2020): Re-examination of the Chinese record of Opisthotropis maculosa (Squamata, Natricidae), resulting in the first national record of O. haihaensis and description of a new species. ZooKeys 913: 141-159, DOI: http://dx.doi.org/10.3897/zookeys.913.48622, URL: http://dx.doi.org/10.3897/zookeys.913.48622
5476E9250F415D7291AB8EC4480C8DB9.taxon	description	Description of holotype. Body cylindrical, slender, round to oval in cross section; TL 501.2 mm (SVL 401.6 mm, TaL 99.6 mm); tail thin and pointed, TaL 20 % of TL; head small, indistinct from neck; right upper maxilla with 16 subequal teeth or sockets, teeth small, curved, without diastema; rostral nearly flattened, small, slightly less than twice as broad as deep, barely visible from above; two internasals, crescent-shaped, in contact with each other medially behind the rostral, not in contact with loreal, posteriorly in contact with prefrontal; a single prefrontal, in contact with loreal and preocular laterally, with frontal posteriorly, not in contact with supraocular; a single frontal, hexagonal, in contact with supraocular laterally, with two parietals posteriorly; parietals large, in contact with each other medially; nasal directed dorsally, polygonal, in contact with first and second supralabials ventrally, with loreal and prefrontal posteriorly, with internasal dorsally, with rostral anteriorly; nostril horizontally oval, in the upper part of nasal; a short vertical cleft below the nostril and dividing nasal into anterior and posterior parts, pointing to middle of upper edge of second supralabial; a single loreal, trapezoid, not entering the orbit, in contact with second and third supralabials laterally; a single supraocular, much longer than wide, obliquely set; a single preocular, higher than wide, in contact with frontal; a single postocular; a single anterior temporal, significantly elongate, in broad contact with the elongated sixth supralabial; a single posterior temporal, pentagonal; supralabials 7 / 7, the sixth one significantly elongate, the last one much shorter than the adjacent preceding supralabial; fourth and fifth supralabials entering orbit; infralabials 7 / 7, the first one in contact with its fellow behind the mental; two pairs of chin shields; anterior chin shields larger, in contact with each other medially, and in contact with the first four infralabials on both sides; posterior chin shields smaller, in contact with each other; dorsal scales in 15 - 15 - 15 rows; dorsal scales of body smooth throughout; dorsal scales of tail weakly keeled; ventrals 170; cloacal plate divided; subcaudals 76, paired.	en	Wang, Jian, Lyu, Zhi-Tong, Zeng, Zhao-Chi, Lin, Chao-Yu, Yang, Jian-Huan, Nguyen, Truong Quang, Le, Minh D., Ziegler, Thomas, Wang, Ying-Yong (2020): Re-examination of the Chinese record of Opisthotropis maculosa (Squamata, Natricidae), resulting in the first national record of O. haihaensis and description of a new species. ZooKeys 913: 141-159, DOI: http://dx.doi.org/10.3897/zookeys.913.48622, URL: http://dx.doi.org/10.3897/zookeys.913.48622
5476E9250F415D7291AB8EC4480C8DB9.taxon	distribution	Distribution and habits. Opisthotropis hungtai sp. nov. is currently known from Heishiding Nature Reserve (ca 300 m a. s. l.) and Dawuling Forestry Station (ca 900 m a. s. l.) in western Guangdong, and Mt. Wuhuang (ca 500 m a. s. l.) in southeastern Guangxi. The specimen from Mt. Wuhuang was collected in a rocky stream. Besides, specimens from Heishiding Nature Reserve were found in pelitic gutterways along the dirt path, and specimens from Dawuling Forestry Station were collected in a pelitic stream. The collection sites were all surrounded by well-preserved, dense deciduous forest.	en	Wang, Jian, Lyu, Zhi-Tong, Zeng, Zhao-Chi, Lin, Chao-Yu, Yang, Jian-Huan, Nguyen, Truong Quang, Le, Minh D., Ziegler, Thomas, Wang, Ying-Yong (2020): Re-examination of the Chinese record of Opisthotropis maculosa (Squamata, Natricidae), resulting in the first national record of O. haihaensis and description of a new species. ZooKeys 913: 141-159, DOI: http://dx.doi.org/10.3897/zookeys.913.48622, URL: http://dx.doi.org/10.3897/zookeys.913.48622
