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Trimeresurus yingjiangensis CHEN, ZHANG, SHI, TANG, GUO, SONG & DING, 2019

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Higher TaxaViperidae, Crotalinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Yingjiang green pitviper
Chinese: Yíng jiāng zhú yè qīng (盈江竹叶青) 
SynonymTrimeresurus yingjiangensis CHEN, ZHANG, SHI, TANG, GUO, SONG & DING 2019
Popeia yingjiangensis — WANG 2022 
DistributionChina (Yunnan), Myanmar (Htamanthi wildlife sanctuary, Sagaing Division)

Type locality: Heihe Village, Kachang Town, Yingjiang County, Yunnan Province (24.782° N, 97.878° E, 1112 m elevation)  
TypesHolotype: CIB DL2017070101, adult male, collected by Li DING on 19 July 2017 (Figure 1).
Paratypes: ZL-tspynglg-2018- 01(allotype, GIABR) adult female, collected from Heping Village, Tongbiguan Town, Yingjiang County, Yunnan Province (24.584° N, 97.738° E, 1 200 m) by Jian XU. DL201070102 (CIB), adult male, and DL201070103 (CIB), adult male, collected by Li DING at the same time as Holotype. OV2671 (IVPP), collected from the Yingjiang County (24.734° N, 97.843° E, 1074 m) by Jingsong SHI on 6 September 2017. 
DiagnosisDiagnosis. Trimeresurus yingjiangensis sp. nov. is assigned to Popeia group by hemipenes morphology (Malhotra and Thorpe, 2004), differ with its congeners by a combination of following characters: (1) dorsal body olive drab,without cross bands on the scales; (2) a conspicuous bicolor ventrolateral stripe present on each side of males, first row of dorsal scales firebrick with a white ellipse dot on posterior upper part in male, these strips absent in females; (3) the eyes firebrick in both gender; tail red, mottled with green laterally, and the ventrolateral stripes discontinuous on the tail; (4) hemipenes long, reaching 23rd to 25th SC, forked opposite 5-6th SC (n = 4), bifurcated near the base and the sulcus spermaticus split from the apex to basal without spines; (5) 21 DSR at middle body, moderately keeled; VEN = 164–168 (n = 5), SC = 60–76 (n = 5); Sexual dimorphism, the female has more ventrals and fewer subcaudals than males; (6) tail long, with ratios of TaL/TL between 0.199 and 0.219 in male.

Comparison with other species. T. yingjiangensis sp. nov. is distinct from T. popeiorum (Lectotype, Pope and Pope, 1933) by the following characters: (1) First row of dorsal scales on each side firebrick with a white ellipse dot on posterior upper part in males vs. “brown with yellow tip” in males; (2) lowest quarter of second row white in males vs. “yellow below keel”; (3) suboculars separated from 3rd upper labial by one scale on each side vs. “two scales on each side”; (4) upper part of second upper labial separated from nasal by two small scales smaller than nostril on either side vs. “separated from nasal by two large scales on either side”.
T. yingjiangensis sp. nov. is distinct from T. nebularis by the following characters: (1) body olive drab, upper lips green with white tip, vs. body bright green with blue tones and blue upper lips; (2) eyes firebrick vs. pale green; (3) ventrolateral stripes bicolor in males vs. uniformly white or blue; (4) in males: ventrals 164–167 (n = 4), vs. 149–153 (n = 8), subcaudals 71–76 (n = 4) vs. 61–65 (n = 8).
T. yingjiangensis sp. nov. is different from T. sabahi, T. cf sabahi (from Sumatra), T. fucatus, T. barati and T. toba by following characters: (1) MSR 21 (vs. MSR 19 in T. barati); (2) dorsal color was olive drab with conspicuous bicolor ventrolateral stripes and no crossbars (vs. dorsal color was green with irregular rusty or reddish-brown dorsal crossbands and white dots on the vertebral scales in T. fucatus); (3) the ventrolateral stripe bicolor in males (vs. white in males of T. cf sabahi from Sumatra, and white in males of T. toba); (4) the temporal scales smaller than those in T. toba; (5) no ventrolateral stripe present on females (vs. white or yellow ventrolateral stripe present on females of T. sabahi); (6) the eyes firebrick (vs. yellow in T. sabahi, and orange in T. barati); (7) VEN 164–168, n = 5 (vs. VEN 142–158, n = 17 in T. barati, 147–157, n = 14, in T. sabahi, and 153–155, n = 3, in Sumatra T. cf sabahi). The comparisons of main morphological characters are summarized in Table 2 in Chen et al. 2019. 
EtymologyThe specific name yingjiangensis refers to the location of type specimens, Yingjiang Country, Yunnan Province, China. 
  • CHEN, Zening; Liang ZHANG, Jingsong SHI, Yezhong TANG, Yuhong GUO, Zhaobin SONG and Li DING 2019. A New Species of the Genus Trimeresurus from Southwest China (Squamata: Viperidae). Asian Herpetological Research 10 (1): 13–23 - get paper here
  • Liu, Shuo; Ye Htet Lwin, Rui-chang Quan 2022. First Record of Trimeresurus yingjiangensis (Squamata: Viperidae) from Myanmar Russian Journal of Herpetology 28 (2): 85-92
  • 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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