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Trimeresurus honsonensis (GRISMER, NGO & GRISMER, 2008)

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Higher TaxaViperidae, Crotalinae, Colubroidea, Alethinophidia, Serpentes, Squamata (snakes) 
Subspecies 
Common Names 
SynonymCryptelytrops honsonensis GRISMER, NGO & GRISMER 2008
Trimeresurus (Trimeresurus) honsonensis — DAVID et al. 2011
Trimeresurus honsonensis — WALLACH et al. 2014: 742 
DistributionS Vietnam

Type locality: Hon Son island in the Kien Hai District of the Kien Giang Province, Vietnam. It was collected at 09° 47’ 95.2” N, 104° 37’ 85.6” E at 100 m elevation.  
Reproductionviviparous 
TypesHolotype: UNS 0353 
DiagnosisDiagnosis. Cryptelytrops honsonensis differs from all other species of Cryptelytrops by the combination of having dark body bands; lacking a ventrolateral stripe and a red or reddish-brown tail; having a dull-yellow to brown ground color as opposed to being green; females having a maximum SVL of 557 mm and a SVL of 523 mm in the single male; females having a TaL/SVL ratio of 0.15–0.16 and a ratio of 0.23 in the single male; 21 dorsal scale rows at midbody; 183–186 ventral scales in females and 186 in the male; 54–58 subcaudal scales in females and 74 in the male; 10 or 11 supralabials and 12 infralabials; 9–12 scales across the top of the head; smooth occipital and temporal scales; internasals in contact; and the third and fourth supralabials not contacting the subocular scale. Table 2 summarizes the states of these characters across all 13 species of Cryptelytrops [from GRISMER et al. 2008]. 
CommentVenomous!

Conservation: one of the 30 most endangered viper species (Maritz et al. 2016). 
EtymologyThe specific epithet honsonensis is in reference to the type locality, Hon Son Island. 
References
  • DAVID, PATRICK; GERNOT VOGEL & ALAIN DUBOIS 2011. On the need to follow rigorously the Rules of the Code for the subsequent designation of a nucleospecies (type species) for a nominal genus which lacked one: the case of the nominal genus Trimeresurus Lacépède, 1804 (Reptilia: Squamata: Viperidae). Zootaxa 2992: 1–51 - get paper here
  • Grismer, L. Lee; Tri, Ngo Van; Grismer, Jesse L. 2008. A new species of insular pitviper of the genus Cryptelytrops (Squamata: Viperidae) from southern Vietnam. Zootaxa 1715: 57-68 - get paper here
  • Maritz, Bryan; Johannes Penner, Marcio Martins, Jelka Crnobrnja-Isailović, Stephen Spear, Laura R.V. Alencar, Jesús Sigala-Rodriguez, Kevin Messenger, Rulon W. Clark, Pritpal Soorae, Luca Luiselli, Chris Jenkins, Harry W. Greene 2016. Identifying global priorities for the conservation of vipers Biological Conservation, doi:10.1016/j.biocon.2016.05.004 - get paper here
  • Nguyen, S.V., Ho, C.T. and Nguyen, T.Q. 2009. Herpetofauna of Vietnam. Chimaira, Frankfurt, 768 pp.
  • 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.
 
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