Abstract
A new species of xenodermatid snake, Achalinus yunkaiensis J. Wang, Y. Li & Y.Y. Wang, sp. nov. was described based on a series of specimens collected from Dawuling Forestry Station located in the Yunkai Mountains of western Guangdong Province. It can be distinguished from known congeners by a significant genetic divergence at the mitochondrial CO1 gene fragment examined (p-distance ≥ 12.0%) and the following combination of characters: (1) dorsal scales strongly keeled, in 23 rows throughout the body, the most outer row on each side smooth and significantly enlarged; (2) tail relatively shorter, TaL/TL ratio 18.5–20.0%; (3) maxillary teeth 20–22; (4) length of suture between internasals subequal to that between the prefrontals; (5) nasal divided into two sections by nasal cleft, posterior one half as long as anterior; (6) loreal elongated, nearly twice as wide as high; (7) supralabials six; (8) infralabials six; (9) temporals 2+2+3 (rarely 2+2+4), the two anterior temporals in contact with eye; (10) ventrals 151–162, subcaudals 49–56 arranged in single row, not paired; (11) cloacal entire; (12) uniform brown (in adults) or black (in juveniles) above, tinged weakly iridescent, with a longitudinal dark-colored vertebral line; (13) light brown (in adults) or greyish white (in juveniles) beneath; and (14) dorsum with a longitudinal dark brown vertebral stripe from posterior margin of parietals to tail tip. Currently, 13 species are known in the genus Achalinus, with seven from mainland China.
References
Bourret, R. (1937) Notes herpétologiques sur l’Indochine française. XV. Lézards et serpents reçus au Laboratoire des Sciences Naturelles de l’Université au cours de l’année 1937. Descriptions de deux espèces et de deux variétés nouvelles. Bulletin général de l’Instruction Publique, Hanoi, 17e Année (1937–1938), 4 (Décembre 1937), 57–80.
https://doi.org/10.1080/00222938809460874
Boulenger, G.A. (1888) Description of two new snakes from Hongkong, and note on the dentition of Hydrophis viperina. Annals & Magazine of Natural History, Series 6, 7 (2), 43−44.
Darriba, D., Taboada, G.L., Doallo, R. & Posada, D. (2012) jModelTest 2: more models, new heuristics and high-performance computing. Nature Methods, 9 (8), 772.
http://doi.org/10.1038/nmeth.2109
Goris, R.C. & Maeda, N. (2004) Guide to the amphibians and reptiles of Japan. Krieger Publishing Company, Malabar, 285 pp.
Hu, S.Q. & Zhao, E.M. (1966) Three new species of reptiles from Szechwan. Acta Zootaxon, Sinica, Peking, 3 (2), 158−164. [in Chinese with English abstract]
Karsen, S.J., Lau, M.W. & Bogadek, A. (1986) Hong Kong amphibians and reptiles. Urban Council, Hongkong, 136 pp.
Koshikawa, A. (1982) Three new species of reptiles from Hainan Island, Guangdong Province. Smithsonian Herpetological Information Service, 53, 1–10.
https://doi.org/10.5479/si.23317515.53.1
Lyu, Z.T., Wu, J., Wang, J., Sung, Y.H., Liu, Z.Y., Zeng, Z.C., Wang, X., Li, Y.Y. & Wang, Y.Y. (2018) A new species of Amolops (Anura: Ranidae) from western Guangdong, China. Zootaxa, 4418 (6), 562–576.
https://doi.org/10.11646/zootaxa.4418.6.4
Meyer, C.P., Geller, J.B. & Paulay, G. (2005) Fine scale endemism on coral reefs: archipelagic differentiation in turbinid gastropods. Evolution, 59 (1), 113–125.
https://doi.org/10.1111/j.0014-3820.2005.tb00899.x
Ota, H. & Toyama, M. (1989) Taxonomic re-definition of Achalinus formosanus Boulenger (Xenoderminae: Colubridae: Ophidia), with description of a new subspecies. Copeia, 1989 (3), 597−602.
https://doi.org/10.2307/1445485
Ronquist, F., Teslenko, M., Van Der Mark, P., Ayres, D.L., Darling, A., Höhna, S., Larget, B., Liu, L., Suchard, M.A. & Huelsenbeck, J.P. (2012) MrBayes 3.2: efficient Bayesian phylogenetic inference and model choice across a large model space. Society of Systematic Biologists, 61, 539–542.
https://doi.org/10.1093/sysbio/sys029
Silvestro, D. & Michalak, I. (2012) raxmlGUI: a graphical front-end for RAxML. Organisms Diversity & Evolution, 12, 335–337.
https://doi.org/10.1007/s13127-011-0056-0
Smith, M.A. (1943) The fauna of British India, including Ceylon and Burma. Reptilia and Amphibia. Vol. III. Serpentes. Taylor & Francis Ltd., London, 583 pp.
Tamura, K., Stecher, G., Peterson, D., Filipski, A. & Kumar, S. (2013) MEGA6: Molecular Evolutionary Genetics Analysis version 6.0. Molecular Biology and Evolution, 30, 2725–2729.
https://doi.org/10.1093/molbev/mst197
Thompson, J.D., Gibson, T.J., Plewniak, F., Jeanmougin, F. & Higgins, D.G. (1997) The Clustal x windows interface: flexible strategies for multiple sequence alignment aided by quality analysis tools. Nucleic Acids Research, 25, 4876−4882.
https://doi.org/10.1093/nar/25.24.4876
Van Denburgh, J. (1912) Concerning certain species of reptiles and amphibians from China, Japan, the Loo Choo Islands, and Formosa. Proceedings of The California Academy of Sciences, 3, 187−258.
Wang, J., Zeng, Z.C., Lyu, Z.T., Liu, Z.Y. & Wang, Y.Y. (2018a) Description of a new species of Gracixalus (Amphibia: Anura: Rhacophoridae) from Guangdong Province, southeastern China. Zootaxa, 4420 (2), 251–269.
https://doi.org/10.11646/zootaxa.4420.2.7
Wang, J., Yang, J.H., Li, Y., Lyu, Z.T., Zeng, Z.C., Liu, Z.Y., Ye, Y.H. & Wang, Y.Y. (2018b) Morphology and molecular genetics reveal two new Leptobrachella species in southern China (Anura, Megophryidae). Zookeys, 776, 105–137.
https://doi.org/10.3897/zookeys.776.22925
Wang, Y.Y., Chen, C.Q., Zhao, J., Wu, Y., Lyu, Z.T., Yang, J.H., Yu, W.H., Lin, J.S., Liu, Z.Y., Wang, J., Du, Q., Zhang, Z., Song, Y.Z., Wang, Z.R. & He, G.Q. (2017) Color Atlers of Terrestrial Vertebrates of the Jinggangshan Region in China. Science Press, Beijing, 298 pp.
Ziegler, T. (2002) Die Amphibien und Reptilien eines Tieflandfeuchtwald-Schutzgebietes in Vietnam. Natur & Tier Verlag, Münster, 342 pp.
Ziegler, T., Nguyen, T.Q., Pham, C.T., Nguyen, T.T., Pham, A.V., Schingen, V.S., Nguyen, T.T. & Le, M.D. (2019) Three new species of the snake genus Achalinus from Vietnam (Squamata: Xenodermatidae). Zootaxa, 4590 (2), 249−269.
https://doi.org/10.11646/zootaxa.4590.2.3
Zong, Y. & Ma, J. (1983) A new species of the genus Achalinopsis from Jiangxi and the restoration of this genus. Acta Herpetologica Sinica, 2 (2), 61−63. [in Chinese]
Zhao, E.M. (2006) Snakes of China. Anhui Science and Technology Publishing House, Hefei, 372 (texts) + 279 pp. (photos). [in Chinese]
Zhao, E.M., Huang, M.H. & Zong, Y. (1998) Fauna Sinica: Reptilia. Vol. 3. Squamata, Serpentes. Science Press, Beijing, 522 pp. [in Chinese]