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Dendrelaphis nigroserratus VOGEL, VAN ROOIJEN & HAUSER, 2012

IUCN Red List - Dendrelaphis nigroserratus - Least Concern, LC

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Higher TaxaColubridae, Ahaetuliinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Subspecies 
Common NamesSaw-tooth-necked Bronzeback 
SynonymDendrelaphis nigroserratus VOGEL, VAN ROOIJEN & HAUSER 2012
Dendrelaphis striatus — SEESOOK 2000
Dendrelaphis striatus — PAUWELS et al. 2000
Dendrelaphis cyanochloris — PAUWELS et al. 2003
Dendrelaphis nigroserratus — WALLACH et al. 2014: 219 
DistributionWest Thailand (Tak), extreme S Myanmar (Mergui, Myeik)

Type locality: Umphang Wildlife Sanctuary, Umphang district, province Tak, Thailand. Found on Highway 1090, at 5.1 km north and uphill from the bridge over the Mae Klong Khi, near the Karen village of Mae Klong Khi, c. 1100 m elevation.  
Reproductionoviparous. 
TypesHolotype: QSMI 1282, juvenile road-killed female (Fig. 4, 6) collected by Sjon Hauser, on 13 October 2011
Paratypes (2 specimens). – BMNH 1946.1.6.13 (formerly 1925.9.17.16), female, “Mergui, Burma”, collector F. Wall; ZFMK 92809, damaged specimen, sex unknown, probably a female, “Between Umphang and Mae Sot, Tak Province, Thailand”, collector: G. Vogel. 
CommentD. nigroserratus sp. nov. is similar to D. cyanochloris (Wall, 1921) with which it occurs sympatrically. It is distinguished from the latter by its highly conspicuous neck coloration, high incidence of paired postparietal shields and its much larger size. In coloration, it resem- bles D. striatus (Cohn, 1906) from which it is distinguished by several aspects of its morphology.

Diagnosis. A species of the colubrid genus Dendrelaphis characterized by 1) a black postocular stripe that extends onto the neck where it forms a pronounced saw-tooth pattern that further posteriorly breaks up into broad black oblique bars, 2) ground colour olive, 3) pale ventrolateral line absent, 4) strongly enlarged vertebral scales, 5) 15 smooth dorsal scales at midbody, 6) 197–204 ventral scales, 7) 148–152 paired subcaudal scales, 8) anal shield divided, 9) relative tail-length 0.30–0.31, 10) 9 supralabials, 4th through 6th touch the eye, 11) maximum known total length 156 cm.

Behavior: diurnal 
EtymologyEtymology and suggested common name. The specific epithet is based on the Latin niger (black) and serrare (to saw) and refers to the conspicuous black zigzag (saw-toothed) pattern on the neck. 
References
  • Blackburn, D.G. 1993. STANDARDIZED CRITERIA FOR THE RECOGNITION OF REPRODUCTIVE MODES IN SQUAMATE REPTILES. Herpetologica 49 (1): 118-132 - get paper here
  • Kwet, Axel 2013. Liste der im Jahr 2012 neu beschriebenen Reptilien. Terraria-Elaphe 2013 (3): 52-67 - get paper here
  • VOGEL, GERNOT; JOHAN VAN ROOIJEN & SJON HAUSER 2012. A new species of Dendrelaphis Boulenger, 1890 (Squamata: Colubridae) from Thailand and Myanmar. Zootaxa 3392: 35–46 - get paper here
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. Taylor and Francis, CRC Press, 1237 pp.
 
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