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Trimeresurus guoi CHEN, SHI, VOGEL & DING, 2021

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Higher TaxaViperidae, Crotalinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Guo’s green pit viper
Chinese: Diān Nán Zhú Yè Qīng (滇南竹叶青) 
SynonymTrimeresurus guoi CHEN, SHI, VOGEL & DING 2021
Trimeresurus albolabris – ZHU et al. 2016 
DistributionChina (Yunnan), Vietnam (Lao Cai), Thailand (Loei and Pha Yao) and Myanmar (Mon State)

Type locality: Jiangcheng County, Yunnan Province,China (22.5738°N, 101.6095° E)  
TypesHolotype: YNJC0012 adult male, a roadkill, collected by Ding Li, on 9 September 2019
Paratypes: (n = 9): CIB 
DiagnosisDiagnosis: (1) Dorsal body jungle-green with faint transverse dark bands on skin, ventral body yellow green. (2) Lateral head jungle-green above lower margin of eyes, and green yellow below, without postocular stripes. (3) Ventrolateral line of male yellow-green, narrow, only present on outermost row of dorsal scales. (4) Iris firebrick-red in both sexes. (5) First supralabial fused with nasal. (6) Head scales feebly keeled; dorsal scale row 23-21-15 (N = 10), feebly keeled except the outermost rows;ventral scale 154–163 in males (N = 6), 158–160 in females (N =3); subcaudal scale 58–72 in males (N = 7), 52–59 in females (N= 3). (7) Hemipenes long, reaching 23rd/32nd subcaudals when unextruded/extruded, papillae relatively weak and sparse. (CHEN et al. 2021).

Comparisons: The new species morphologically differs from T. albolabris in the yellow green ventral color; an indistinct ventrolateral line; the absence of a postocular stripe; the firebrickred iris; a dark red stripe on dorsal tail; hemipenes with relatively weak sparse papillae, reaching 23rd subcaudal when unextruded. For additional detailed comparisons see CHEN et al. 2021.

Color in life: Dorsal head and body jungle green. Lateral head jungle-green above lower margin of eyes, and green-yellow below, without postocular stripes. Dark transverse bands the width of one to three dorsal scales present on body,. Lateral body mostly jungle-green, gradually lighter from spine to ventrals. First row of dorsal scales grass-green, with a narrow green-yellow longitudinal stripe, which forms a faint green-yellow ventrolateral line. Ventral body yellow-green, becoming lighter in color anteriorly. Tail with a dark red longitudinal stripe in inner two rows of dorsal scales, other dorsal scales on tail jungle-green. Most SC green-yellow, posterior one third gradually dark red. Iris firebrick-red, pupils edged with lighter color. Tone coloration maroon (CHEN et al. 2021). 
EtymologyThe specific name is in honor of Dr. Peng Guo (Sichuan, China), the first researcher on the taxonomy and systematics of the genus Trimeresurus sensu lato through molecular analysis in China. 
  • CHEN, Zening; Shengchao SHI, Jun GAO, Gernot VOGEL, Zhaobin SONG, Li DING, Rong DAI 2021. A New Species of Trimeresurus Lacépède, 1804 (Squamata: Viperidae) from Southwestern China, Vietnam, Thailand and Myanmar. Asian Herpetological Research 12 (2): 167-177 - get paper here
  • Zhu, Fei; Qin Liu, Jing Che, Liang Zhang, Xin Chen, Fang Yan, Robert Murphy, Cong Guo and Peng Guo 2016. Molecular phylogeography of white-lipped tree viper (Trimeresurus; Viperidae). Zoologica Scripta DOI: 10.1111/zsc.12156 - get paper here
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