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Trimerodytes yunnanensis (RAO & YANG, 1998)

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Higher TaxaColubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Yunnan Annulate Keelback, Yunnan Water Snake
Vietnamese: Ran hoa can van nam
Chinese: “Yun Nan Hua You She” ( 云南华游蛇 ) 
SynonymSinonatrix yunnanensis RAO & YANG 1998
Sinonatrix yunnanensis — VOGEL et al. 2004
Sinonatrix yunnanensis — WALLACH et al. 2014: 677
Trimerodytes yunnanensis — REN et al. 2019 
DistributionChina (Jingdong, Menglian, Jinggu, Yongde, Lufeng Yunnan, China), Thailand (Lampang, Chiang Mai, Nan), Vietnam

Elevation 400 to > 1,000 m

Type locality: Dingpa of Jingdong County, Yunnan 1700 m elevation), China  
TypesHolotype: KIZ 75II0191, adult male, May 11, 1975. 
DiagnosisDiagnosis: The new species is very similar to Sinonatfix aequifasciata (Barbour) and typically with X marks on the side of body and tail, but with 31- 35 maxillary teeth and 156 - 165 ventrals which obviously differ from S. aequifasciata; the later have 23 - 28 maxillary teeth and 142 - 154 ventrals [from RAO & YANG 1998]. 
EtymologyNamed after the type locality. 
  • Danaisawadi P, Taksinthum W 2022. Range and elevation extension for the Yunnan Water Snake, Trimerodytes yunnanensis (Rao & Yang, 1998) (Serpentes, Colubridae), from Thailand and some notes on its natural history. Check List 18(2): 385-390 - get paper here
  • Das, I. 2012. A Naturalist's Guide to the Snakes of South-East Asia: Malaysia, Singapore, Thailand, Myanmar, Borneo, Sumatra, Java and Bali. Oxford J, ohn Beaufoy Publishing - get paper here
  • Le, Dzung Trung; Anh Van Pham, Cuong The Pham, Son Lan Hung Nguyen, Thomas Ziegler, Truong Quang Nguyen 2015. Review of the Genus Sinonatrix in Vietnam with a New Country Record of Sinonatrix yunnanensis Rao et Yang, 1998. Russ. J. Herpetol. 22 (2): 84-88
  • Pauwels, O.S.G.; Kunya, K.; David, P. & Sumontha, M. 2009. First record of the Yunnan Keelback Sinonatrix yunnanensis RAO & YANG 1998 (Serpentes: Natricidae) from Thailand. Salamandra 45 (3): 165-169 - get paper here
  • PAWANGKHANANT, PARINYA et al. 2022. Geographic distribution: TRIMERODYTES YUNNANENSIS (Yunnan Annulate Keelback). THAILAND: CHIANG MAI PROVINCE Herpetological Review 53 (1): 83
  • Pham AV, Ziegler T, Nguyen TQ 2020. New records and an updated checklist of snakes from Son La Province, Vietnam. Biodiversity Data Journal 8: e52779 - get paper here
  • Rao, DING QI & D. T. YANG. 1998. A new species of Sinonatrix (Serpentes: Colubridae) of China with preliminary survey on Sinonatrix. Russ. J. Herpetol. 5 (1): 70-73. - get paper here
  • REN, Jinlong; Kai WANG, Peng GUO, Yingyong WANG, Tao Thien NGUYEN, and Jiatang LI 2019. On the Generic Taxonomy of Opisthotropis balteata (Cope, 1895) (Squamata: Colubridae: Natricinae): Taxonomic Revision of Two Natricine Genera. Asian Herpetological Research 10 (2): 105–128; DOI: 10.16373/j.cnki.ahr.180091 - get paper here
  • Vogel, Genot; Patrick David, Olivier S. G. Pauwels and Norbert Brachtel 2004. On the occurence of the watersnake Sinonatrix aequifasciata (Barbour, 1908) (Serpentes, Colubridae, Natricinae) in Vietnam. Hamadryad 29 (1): 110 – 114 - get paper here
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. [type catalogue] Taylor and Francis, CRC Press, 1237 pp.
  • Wang K, Lyu ZT, Wang J, Qi S, Che J 2022. Updated Checklist and Zoogeographic Division of the Reptilian Fauna of Yunnan Province, China. Biodiversity Science 30 (4): 21326, 1–31 - 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
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