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Dendrelaphis haasi VAN ROOIJEN & VOGEL, 2008

IUCN Red List - Dendrelaphis haasi - Least Concern, LC
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Higher TaxaColubridae, Ahaetuliinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Haas’s Bronzeback snake 
SynonymDendrelaphis haasi VAN ROOIJEN & VOGEL 2008
Dendrelaphis pictus
Dendrelaphis haasi — LIVIGNI 2013: 396
Dendrelaphis haasi — WALLACH et al. 2014: 218 
DistributionW Malaysia (incl. Tioman Island), Indonesia (Sumatra, Nias, Mentawei Archipelago, Billiton, Java, Borneo), Singapore

Type locality: “Nias”, Indonesia  
Reproductionoviparous 
TypesHolotype: RMNH 5507, an adult male, collector: J.D. Pasteur, collection date: 1890 
DiagnosisDiagnosis: A species of Dendrelaphis, characterized by the combination of: (1) vertebral scales strongly enlarged, larger than the dorsals of the first row; (2) 161-173 ventrals; (3) 126-153 divided subcaudals; (4) 15 dorsal scale rows at midbody; (5) anal shield divided; (6) a long first sublabial that touches 4 infralabials on average (range: 2-5); (7) a single loreal; (8) a single anterior temporal, 3 to 5 temporals in total; (9) 1 to 2 postoculars; (10) a parietal shield that extends far down the side of the head, as a result of which the temporal region is very angular; (11) small eye, 3.4-4.1 mm when adjusted to a SVL of 57.5 cm.; (12) maximum total length 94.5 cm; (13) very long tail, TAIL/TL 0.34-0.38; (14) a narrow postocular stripe that covers the lower part of the lower temporals and ends at the rear of the jaw or extends onto the neck; (15) the presence of oblique black bars on the sides of the neck; (16) the presence of a light ventrolateral stripe that is dull and in most cases barely visible; (17) absence of black lines bordering the ventrolateral stripe. 
CommentSpecimens that belong to D. haasi have been assigned to D. pictus previously.

Behavior: diurnal

Habitat: fully arboreal (Harrington et al. 2018) 
EtymologyThis species is named after Mr C.P.J. De Haas who collected the type-specimens of D. haasi. 
References
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Blackburn, D.G. 1993. STANDARDIZED CRITERIA FOR THE RECOGNITION OF REPRODUCTIVE MODES IN SQUAMATE REPTILES. Herpetologica 49 (1): 118-132 - get paper here
  • Das, I. 2012. A Naturalist's Guide to the Snakes of South-East Asia: Malaysia, Singapore, Thailand, Myanmar, Borneo, Sumatra, Java and Bali. Oxford J, ohn Beaufoy Publishing - get paper here
  • FIGUEROA, ALEX; MARTYN E.Y. LOW, KELVIN K.P. LIM 2023. Singapore’s herpetofauna: updated and annotated checklist, history, conservation, and distribution. Zootaxa 5287 (1): 001–378 - get paper here
  • Gemel, R.; G. Gassner & S. Schweiger 2019. Katalog der Typen der Herpetologischen Sammlung des Naturhistorischen Museums Wien – 2018. Ann. Naturhist. Mus. Wien, B 121: 33–248
  • Harrington, Sean M; Jordyn M de Haan, Lindsey Shapiro, Sara Ruane 2018. Habits and characteristics of arboreal snakes worldwide: arboreality constrains body size but does not affect lineage diversification. Biological Journal of the Linnean Society 125 (1): 61–71 - get paper here
  • Lang, Ruud de 2017. The Snakes of Java, Bali and Surrounding Islands. Edition Chimaira, Frankfurt am Main, Germany, 435 pp. - get paper here
  • Lim, Kelvin K. P. and Loong Fah Cheong 2011. DENDRELAPHIS HAASI (REPTILIA: SQUAMATA: COLUBRIDAE), A NEW SNAKE RECORD FOR SINGAPORE. Nature In Singapore 4: 9–12
  • LiVigni, F. (ed.) 2013. A Life for Reptiles and Amphibians, Volume 1. Chimaira, Frankfurt, 495 pp. - get paper here
  • Rooijen, J. van & Vogel, G. 2008. Contributions to a review of the Dendrelaphis pictus complex (Serpentes: Colubridae) – 1. Description of a sympatric species. Amphibia-Reptilia 29: 101-115 - get paper here
  • Stuebing, R.B., Inger, R.F. & Lardner, B. 2014. A field guide to the snakes of Borneo, second edition. Natural history Publications (Borneo)
  • Syafiq MF, Badli-Sham BH, Grismer LL, Ahmad AB 2023. Uneven species occurrence and richness of lowland snakes (Serpentes, Squamata) in Terengganu, Peninsular Malaysia, with new locality records. ZooKeys 1168: 11–39
  • TEYNIÉ, ALEXANDRE; PATRICK DAVID, & ANNEMARIE OHLER 2010. Note on a collection of Amphibians and Reptiles from Western Sumatra (Indonesia), with the description of a new species of the genus Bufo. Zootaxa 2416: 1–43 - get paper here
  • Vogel, Gernot 2010. Zur Systematik der Schlangen der orientalischen Region: Forschungsdefizite führen zur Unterschätzung der Artenvielfalt. Ophidia 4 (2): 18-26 - get paper here
  • 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.
  • Zug, G.R. & Mulcahy, D.G. 2019. Identification guide Amphibians and reptiles of South Tanintharyi. Fauna & Flora International, 101 pp.
 
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