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Trimeresurus erythrochloris PAWANGKHANANT, IDIIATULLINA, SMITS, DUGDALE, PIERCE, SUWANNAPOOM & POYARKOV, 2025

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Higher TaxaViperidae, Crotalinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesThai: Ngu Khiew Hang Mai Lai Yhak (งูเขียวหางไหม้ลายหยัก)
E: Red-barred Green Pitviper
Russian: Krasno-zelenaya bambukovaya kufiya (Красно-зеленая бамбуковая куфия) 
SynonymTrimeresurus erythrochloris PAWANGKHANANT, IDIIATULLINA, SMITS, DUGDALE, PIERCE, SUWANNAPOOM & POYARKOV 2025 
DistributionThailand (Sa Kaeo)

Type locality: Tham Khao Siwa Cave (13.319°N, 102.332°E; alt. 250 m a.s.l.), Klong Kai Thuen Subdistrict, Klong Hat District, Sa Kaeo Province, Thailand  
Reproduction 
TypesHolotype. RIM-00078, an adult male, collected by Parinya Pawangkhanant, Ton Smits, Ian Dugdale & Andrew Pierce on 7 Oct 2024. Paratype (n=1). RIM-00079, an adult female with the same collection details as the holotype. 
DiagnosisDiagnosis (n=2): The new species differs from other members of the subgenus Trimeresurus by the following combination of characters: dorsal scales in 23-21-15 rows, moderately keeled except the outermost rows, which are smooth; ventral scales 164–172; subcaudals 54–67, all paired; iris golden yellow in both sexes; body dorsally grass green with irregular, serrated, reddish-brown transverse markings; suborbital stripe white and wide in male, absent in female; ventrolateral stripe distinct, present on the first few dorsal scale rows, white and red in male, white in female; throat, chin, and lower labials light turquoise; ventral surfaces pale blue in male, pale green in female; tail dorsally light brick-red mottled with dark spots, ventrally with irregular white markings; hemipenis with well-developed pointed almost spine-like papillae at its base. (Pawangkhanant et al. 2025)


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CommentDistribution: see map in Pawangkhanant et al. 2025: 2 (Fig 1), Pawangkhanant et al. 2025 (516 (Fig. 1). 
EtymologyNamed after Greek erythros (ἐρυθρός) = “red”, and Greek chloros (χλωρός) = “green”, for the coloration. 
References
  • Pawangkhanant P. et al. 2025. A snake can change its finery: a new cryptic species of the Trimeresurus kanburiensis complex (Reptilia: Serpentes: Viperidae) from central Thailand with an unusual ontogenetic color change. Zootaxa, 5621(5): 514-546 - get paper here
  • Pawangkhanant, P., Idiiatullina, S. S., Smits, T., Dugdale, I., Pierce, A., Suwannapoom, C., & Poyarkov, N.A. 2025. A NEW SPECIES OF KARST-ASSOCIATED PITVIPER OF THE Trimeresurus kanburiensis COMPLEX (SQUAMATA: VIPERIDAE) FROM EASTERN THAILAND. TAPROBANICA 14 (1): 1–15 - get paper here
 
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