Abstract
Despite being recognized as ecologically and biogeographically important, the biodiversity of the Hengduan Mountain Region, particularly along the upper Mekong River, remains poorly understood. Here we describe a new species of Mountain Dragon of the genus Japalura sensu lato Gray, 1853 from the headwater region of the Mekong River in Chamdo, Tibet Autonomous Region, China. The species is recognized as a member of the Japalura flaviceps Barbour & Dunn 1919 complex, and it can be distinguished readily from all congeners by a suite of morphological characteristics, including its dwarf appearance (small body size and disproportionally short tails and short hind limbs), smooth or weakly keeled ventral scales, feebly developed vertebral crests in males, and by the absence of distinct gular spots in males and females. In addition to the description of the new species, we also report morphological variations and range extensions of two recently described congeners along the same river, namely J. iadina and J. vela. We discuss the distribution patterns of the genus in the Hengduan Mountain Region and the urgent conservation priorities for protecting Japalura species along the Mekong River. According to our best available data, we provided IUCN assessments of the three species and propos to list them as nationally protected under the Chinese Wildlife Protection Act.
References
Barbour, T. & Dunn, E.R. (1919) Two new Chinese Japaluras. Proceeding of the New England Zoological Club, 7, 15–19.
https://doi.org/10.5962/bhl.part.12089
Cai, B., Wang, Y., Chen, Y. & Li, J. (2015) A revised taxonomy for Chinese reptiles. Biodiversity Science, 23 (3), 365–382. [in Chinese]
https://doi.org/10.17520/biods.2015037
Che, J., Zhou, W., Hu, J., Yan, F., Papenfuss, T.J., Wake, D.B. & Zhang, Y. (2010) Spiny frogs (Paini) illuminate the history of the Himalayan region and Southeast Asia. Proceedings of the National Academy of Sciences, 107 (31), 13765–13770.
https://doi.org/10.1073/pnas.1008415107
Fu, J., Weadick, C.J., Zeng, X., Wang, Y., Liu, Z., Zheng, Y., Li, C. & Hu, Y. (2005) Phylogeographic analysis of the Bufo gargarizans species complex: a revisit. Molecular Phylogenetics and Evolution, 37 (1), 202–213.
https://doi.org/10.1016/j.ympev.2005.03.023
Gao, Z.F. & Hou, M. (2002) Description of a new Japalura species from western Sichuan Province, China. Sichuan Journal of Zoology, 21 (1), 3–5. [in Chinese]
Gray, J.E. (1853) Descriptions of some undescribed species of reptiles collected by Dr. Joseph Hooker in the Khassia Mountains, East Bengal, and Sikkim Himalaya. The Annals and Magazine of Natural History, 12 (2), 386–392.
https://doi.org/10.1080/03745485709495063
Gu, L., Yang, F., Sun, S. & Qi, R. (2016) Overview of the ecological system of the Lancang River. Shanshui Conservation Center, Beijing, 128 pp. Available from: http://lancang.shanshui.org (accessed 2 October 2016)
Hu, S., Zhao, E., Jiang, Y., Fei, L., Ye, C., Hu, Q., Huang, Q., Huang, Y. & Tian, W. (1987) Amphibia-Reptilia of Xizang. Science Press, Beijing, 153 pp. [in Chinese]
Lei, F., Qu, Y., Song, G., Alström, P. & Fjeldså, J. (2015) The potential drivers in forming avian biodiversity hotspots in the East Himalaya Mountains of Southwest China. Integrative Zoology, 10 (2), 171–181.
https://doi.org/10.1111/1749-4877.12121
Li, C., Deng, Q. X., Wu, Y. & Wang, Y. (2001) A new species of Japalura from Sichuan (Agamidae Gray. Japalura). Journal of Sichuan Teachers College, Natural Sciences, 22 (4), 329–331. [in Chinese]
Li, P., Zhao, E. & Dong, B. (2010) Amphibians and Reptiles of Tibet. Science Press, Beijing, 251 pp. [in Chinese]
López‐Pujol, J., Zhang, F., Sun, H., Ying, T. & Ge, S. (2011) Centers of plant endemism in China: places for survival or for speciation? Journal of Biogeography, 38 (7), 1267–1280.
https://doi.org/10.1111/j.1365-2699.2011.02504.x
Macey, J.R., Schulte, J.A., Larson, A., Ananjeva, N.B., Wang, Y., Pethiyagoda, R., Rastegar-Pouyani, N. & Papenfuss, J. (2000) Evaluating trans-tethys migration: an example using acrodont lizard phylogenetics. Systematic Biology, 49, 233–256.
https://doi.org/10.1093/sysbio/49.2.233
Myers, N., Mittermeier, R.A., Mittermeier, C.G., Da Fonseca, G.A. & Kent, J. (2000) Biodiversity hotspots for conservation priorities. Nature, 403 (6772), 853–858.
https://doi.org/10.1038/35002501
Manthey U. (2010) Agamid Lizards of Southern Asia—Draconinae 2, Leiolepidinae. Chimaira, Frankfurt, 168 pp.
Manthey, U., Wolfgang, D., Hou, M. & Wang, X. (2012) Discovered in historical collections: two new Japalura species (Squamata: Sauria: Agamidae) from Yulong Snow Mountains, Lijiang Prefecture, Yunnan, PR China. Zootaxa, 30 (1664), 27–48.
Sabaj Perez, M.H. (2015) Standard symbolic codes for institutional resource collections in herpetology and ichthyology: an online reference. Version 5.0. Washington, D.C. Available from: http: //www.asih.org/ (accessed 28 September 2017)
Gu, L., Yang, F., Sun, S. & Qi, R. (2016) Overview of the ecological system of the Lancang River. Shanshui Conservation Center, 128 pp. Available from: http://lancang.shanshui.org (accessed 28 September 2017)
Köhler, G. 2012. Color catalogue for field biologists. Herpeton, Offnbach, 1–49.
Song, M. (1987) Survey of the reptiles of southern Shaanxi. Acta Herpetologica Sinica, 6 (1), 59–64. [in Chinese]
Wang, K., Jiang, K., Pan, G., Hou, M., Siler, C.D. & Che, J. (2015) A new species of Japalura (Squamata: Sauria: Agamidae) from Eastern Tibet, PR China. Asian Hepetological Research, 6 (3), 159–168.
https://doi.org/10.16373/j.cnki.ahr.140042
Wang, K., Jiang, K., Zou, D., Yan, F., Siler, C.D. & Che, J. (2016) Two new species of Japalura from the Hengduan Mountain Range, China. Zoological Research, 37 (1), 41–56.
https://doi.org/10.13918/j.issn.2095-8137.2016.1.41
Wang, K., Ren, J., Jiang, K., Yuan, Z., Che, J. & Siler, C.D. (2017) Rediscovery of the enigmatic Mountain Dragon, Japalura yulongensis (Reptilia: Saurian: Agamidae), with notes on its natural history and conservation. Zootaxa, 4318 (2), 351–363. https://doi.org/10.11646/zootaxa.4318.2.8
Yang, D. & Rao, D. (2008) Amphibians and Reptiles of Yunnan. Yunnan Science and Technology Press, Kunming, 409 pp. [in Chinese]
Yang, Y., Li, B., Yin, Z. & Zhang, Q. (1982) The formation and evolution of landforms in the Xizang Plateau. Acta Geographica Sinica, 37 (1), 76–87.
https://doi.org/10.11821/xb198201009Yang, Y., Li, B., Yin, Z., Zhang, Q., Wang, F., Jing, K. & Chen, Z. (1983) Geomorphology of Xizang (Tibet). Science Press, Beijing, 238 pp. [in Chinese]
Zhao, E & Yang, D. (1997) Amphibians and Reptiles of the Hengduan Mountain Region. Science Press, Beijing, 303 pp. [in Chinese]
Zhao, E., Zhao, K. & Zhou, K. (1999) Fauna Sinica, Reptilia. Vol. 2. Squamata, Lacertilia. Science Press, Beijing, 394 pp. [in Chinese]
Zhang, R. (1999) Zoogeography of China. Science Press, Beijing, 502 pp. [in Chinese]