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Opisthotropis haihaensis ZIEGLER, PHAM, NGUYEN, NGUYEN, WANG, WANG, STUART, & LE, 2019

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Higher TaxaColubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Hai Ha Mountain Stream Keelback
Vietnamese: Rắn trán hải hà
Chinese: 海河后棱蛇 (Hai He Hou Leng She) 
SynonymOpisthotropis haihaensis ZIEGLER, PHAM, NGUYEN, NGUYEN, WANG, WANG, STUART, & LE 2019
Opisthotropis maculosa — YANG et al. (2011) (part)
Opisthotropis maculosa — STUART & CHUAYNKERN 2007
Opisthotropis maculosa — NGUYEN et al. 2018: 74
DistributionVietnam (Quang Ninh), China

Type locality: forest near Tai Chi Village, Quang Son Commune, Hai Ha District, Quang Ninh Province, 950 m elevation, Vietnam [exact locality and coordinates not provided owing to threat from collection for the pet trade (below)],  
TypesHolotype: IEBR A.2016.34 [Field No. QN 2016.91], adult female, collected by Cuong The Pham and Tan Van Nguyen on 9 May 2016 (Figs. 2–3). 
DiagnosisDiagnosis: A species of the genus Opisthotropis characterized by having the following combination of characters: (1) internasal not in contact with loreal; (2) prefrontal not touching supraocular; (3) frontal touching preocular; (4) one preocular; (5) one postocular; (6) one anterior temporal; (7) one posterior temporal; (8) supralabials eight, fourth and fifth in contact with eye; (9) 24 maxillary teeth; (10) anterior pair of chin shields longer than posterior pair; (11) ventrals 169 (+ 2 preventrals); (12) subcaudals 79; (13) 15 dorsal scale rows at neck, at midbody and before vent; (14) body and tail scales smooth; (15) chin shields yellow with brownish black mottling; (16) body and tail dorsum dark with each a light spot per scale. 
CommentHabitat: The adult female holotype was found at night in a small rocky stream at 2130h. The surround- ing habitat was secondary evergreen forest consisting of small hardwood trees, bamboo, and shrubs (see Nguyen et al., 2018). The air temperature was 24–29°C and the relative humidity was 65–88%. 
EtymologyThis species is named after its type locality in Hai Ha District, Quang Ninh Province, Vietnam. 
  • Wang, J., Lyu, Z-T., Zeng, Z-C., Lin, C-Y., Yang, J-H., Nguyen, T. Q., Le, M. D., Ziegler, T. and Wang, Y-Y. 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. - get paper here
  • Wang, Kai; Jinlong Ren, Hongman Chen, Zhitong Lyu, Xianguang Guo Ke Jiang, Jinmin Chen, Jiatang Li, Peng Guo, Yingyong Wang, Jing Che 2020. The updated checklists of amphibians and reptiles of China. Biodiversity Science 28 (2): 189-218 - get paper here
  • ZIEGLER, THOMAS; CUONG THE PHAM, TAN VAN NGUYEN, TRUONG QUANG NGUYEN, JIAN WANG, YING-YONG WANG, BRYAN L. STUART & MINH DUC LE 2019. A new species of Opisthotropis from northern Vietnam previously misidentified as the Yellow-spotted Mountain Stream Keelback O. maculosa Stuart & Chuaynkern, 2007 (Squamata: Natricidae). Zootaxa 4613 (3): 579–586 - get paper here
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