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Hebius andreae (ZIEGLER & LE KHAC QUYET, 2006)

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Higher TaxaColubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Andrea’s Keelback
Vietnamese: Ran sai Andrea
F: Amphiesma d’Andrea
G: Andreas Gebirgswassernatter 
SynonymAmphiesma andreae ZIEGLER & LE KHAC QUYET 2006
Amphiesma andreae — DAVID et al. 2007
Hebius andreae — GUO et al. 2014
Amphiesma andreae — WALLACH et al. 2014: 28 
DistributionVietnam (Quang Binh), Laos

Type locality: from adjacent to Phong Nha - Ke Bang, Thuong Hoa commune, Minh Hoa district, Quang Binh province, elevation 450 m.  
Reproductionoviparous 
TypesHolotype: ZFMK 83747 
DiagnosisDiagnosis: Amphiesma andreae sp. n. can be distinguished from all congeners on the basis of the following combination of characters: 1) Body and tail slender, tail cylindrical and tapering; tail/total length ratio 0.31; 2) the eye diameter, if projected forward, reaches beyond the suture of first and second supralabial; 3) a single loreal; 4) a single preocular; 5) three postoculars; 6) a single anterior followed by a single posterior temporal; 7) nine supralabials, fourth to sixth in contact with the eye, eighth supralabial largest; 8) nine infralabials, first pair in contact behind the mental, the first five border the anterior chinshields; 9) posterior chin-shields longer than anterior ones, separated on their entire length by gular scales; 10) 179 ventrals (plus two preventrals); 11) anal plate divided; 12) 99 divided subcaudals; 13) dorsal scales in 19-19-17 rows, keeled (except outermost row in the anterior body) with a narrow, sharp keel; 14) dorsal ground coloration brownish-olive, with a pale, black-edged bar before and behind the eye; head and neck with several pale, dark-edged blotches that turn into pale and black-edged transversal bars on the anterior body; such a transversal bar pattern dissolves anterior to the midbody region and then turns into a series of small pale blotches that build each a dorso-lateral stripe that ends at the dorsal tail base; 15) venter light, laterally with dark spots in the forebody region; 16) 34 maxillary teeth, arranged in a continuous series, the two posteriormost distinctly enlarged, without diastema; 17) hemipenis simple, with undivided sperm groove; the outer genital organ is covered with small spines except for a single, strongly enlarged spine next to the sperm groove at the hemipenis base and except for irregularly arranged mediumsized spines that encircle the hemipenis horizontally at the trunco-pedicel area. 
Comment 
EtymologyNamed after Andrea Ziegler in recognition of her patience and support during the last decade of herpetological research of the senior author in Vietnam. 
References
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Böhme, Wolfgang 2014. Herpetology in Bonn. Mertensiella 21. vi + 256 pp. - get paper here
  • David, P., Bain, R. H., Nguyen Quang Truong, Orlov, N. L., Vogel, G., Vu Ngoc Thanh & T. Ziegler 2007. A new species of the natricine snake genus Amphiesma from the Indochinese Region (Squamata: Colubridae: Natricinae). Zootaxa 1462: 41-60 - get paper here
  • GUO, PENG; FEI ZHU, QIN LIU, LIANG ZHANG, JIAN X. LI, YU Y. HUANG & R. ALEXANDER PYRON 2014. A taxonomic revision of the Asian keelback snakes, genus Amphiesma (Serpentes: Colubridae: Natricinae), with description of a new species. Zootaxa 3873 (4): 425–440 - get paper here
  • Nguyen, S.V., Ho, C.T. and Nguyen, T.Q. 2009. Herpetofauna of Vietnam. Chimaira, Frankfurt, 768 pp.
  • Thompson, C. & Thompson, T. 2008. First contact in the Greater Mekong - new species discoveries. WWF, 40 pp. - 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.
  • Ziegler, T., and Quyet, L.K. 2006. A new natricine snake of the genus Amphiesma (Squamata: Colubridae: Natricinae) from the central Truong Son, Vietnam. Zootaxa 1225: 39-56 - get paper here
  • Ziegler, Thomas; Annemarie Ohler; Vu Ngoc Thanh; Le Khac Quyet; Nguyen Xuan Thuan; Dinh Huy Tri & Bui Ngoc Thanh 2006. Review of the amphibian and reptile diversity of Phong Nha – Ke Bang National Park and adjacent areas, central Truong Son, Vietnam. Herpetologica Bonnensis II: 247-262 - get paper here
  • Ziegler, Thomas; Vinh Quang Luu, Thanh Tung Nguyen, Ngoan Van Ha, Hanh Thi Ngo, Minh Duc Le, & Truong Quang Nguyen 2019. Rediscovery of Andrea’s keelback, Hebius andreae (Ziegler & Le, 2006): First country record for Laos and phylogenetic placement. Revue suisse de Zoologie 126(1): 61-71
 
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