Abstract
A new species of the natricine snake genus Amphiesma is described from Central Vietnam and possibly Thailand. Amphiesma leucomystax spec. nov. is distinguished from other species of the Indochinese Region by the combination of a bright, broad white stripe extending below the eye from the tip of the snout to posterior supralabials and the neck, dorsolateral series of aligned, transversally elongated or divided spots, 19 dorsal scale rows at midbody, two first rows of dorsal scale rows smooth, moderately sized eyes, a high number of ventral scales (at least 154), and 1 anterior temporal. Its relationships with other Amphiesma species with 19 dorsal scale rows are discussed. Amphiesma leucomystax spec. nov. seems to be close to A. boulengeri. A key to the species of Amphiesma from the Indochinese Region is provided.References
Bourret, R. 1936. Les Serpents de l’Indochine. Tome II. Catalogue systématique descriptif. - Toulouse, Henri Basuyau et Cie: 1–505.
David, P. & I. Das. 2003. A new species of the snake genus Amphiesma (Serpentes: Colubridae: Natricinae) from western Sumatra, Indonesia. Raffles Bulletin of Zoology, 51 (2): 413–419.
David, P., N. Orlov, G. Vogel & T. Ziegler. In prep. On the status of Parahelicops annamensis Bourret, 1934 (Squamata: Colubridae: Natricinae).
David, P., G. Vogel & O. S. G. Pauwels. 2005. On the occurrence of Amphiesma bitaeniatum (Wall, 1925) in Vietnam, with preliminary remarks on the group of Amphiesma parallelum (Boulenger, 1890) (Serpentes, Colubridae, Natricinae). Salamandra, 41 (4): 725–735.
Dowling, H. G., 1951. A proposed standard system of counting ventrals in snakes. British Journal of Herpetology, 1 (5): 97–99.
Malnate, E. V., 1960. Systematic division and evolution of the colubrid snake genus Natrix, with comments on the subfamily Natricinae. Proceedings of the Academy of Natural Sciences of Philadelphia, 112 (3): 41–71.
Malnate, E. V., 1962. The relationships of five species of the Asiatic natricine snake genus Amphiesma. Proceedings of the Academy of Natural Sciences of Philadelphia, 114 (8): 251–299.
Malnate, E. V. & G. Underwood, 1988. Australasian natricine snakes of the genus Tropidonophis. Proceedings of the Academy of Natural Sciences of Philadelphia, 140 (1): 59–201.
Nguyen, V. S., Ho, T. C. & Nguyen, Q. T., 2005. Danh luc Êch nhái và Bo Sát Viêt Nam. A checklist of Amphibians and Reptiles of Vietnam. Hanoi, Nhà Xuât Ban Nông Nghiêp (Agri. Publishing House): 1–180 (in Vietnamese).
Pope, C. H. 1935. The reptiles of China. Turtles, crocodilians, snakes, lizards. American Museum of Natural History, New York, Natural History of Central Asia: i-xlii + 1–604, Pls. 1–27.
Smith, M. A., 1943. The Fauna of British India, Ceylon and Burma, including the whole of the Indo-Chinese Sub-region. Reptilia and Amphibia. Vol. III. - Serpentes. London, Taylor & Francis: i–xii, 1–583.
Taylor, E. H., 1965. The serpents of Thailand and adjacent waters. University of Kansas Science Bulletin, 45 (9): 609–1096.
Zhao, E. M., M. H. Huang, Y. Zong, J. Zheng, Z. J. Huang, D. Yang & D. J. Li (Eds.). 1998. Fauna Sinica. Reptilia Vol. 3. Squamata Serpentes. Beijing, Science Press: i–xvii + 1–522, Pls. I–VIII, Col. Pls. I–IV (in Chinese).
Ziegler, T. 2002. Die Amphibien und Reptilien eines Tieflandfeuchtwald-Schutzgebietes in Vietnam. Münster, Natur und Tier - Verlag GmbH: 1–342.
Ziegler, T., H.-W. Herrmann, Vu, N. G., Le K. Q., Nguyen T. H., Cao X. C., Luu M. T. & Dinh H. T. 2004. The amphibians and reptiles of the Phong Nha - Ke Bang National Park, Quang Binh Province, Vietnam. Hamadryad, 28 (1–2): 19–42.
Ziegler, T. & Le, K. Q. 2006. A new natricine snake of the genus Amphiesma (Squamata: Colubridae: Natricinae) from the central Truong Son, Vietnam. Zootaxa, 1225: 39–56.