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Trimerodytes yunnanensis (RAO & YANG, 1998)

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Higher TaxaColubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
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, Vietnam

Type locality: Dingpa of Jingdong County, Yunnan 1700 m elevation), China  
Reproductionoviparous 
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]. 
Comment 
References
  • 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
  • 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
  • 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, 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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