Abstract
We describe two new Kukri snakes of the genus Oligodon from the Nakhon Si Thammarat Mountain Range, southern peninsular Thailand. Oligodon phangan sp. nov., endemic to Pha-Ngan Island, Surat Thani Province, is characterized by a maximal known SVL of 369.1 mm; 12 maxillary teeth, the posterior three enlarged; 17-17-15 dorsal scale rows; 163–166 ventrals; 33–42 divided subcaudals; a single anal; dorsal color brown with a pair of discreet paravertebral and lateral stripes; no dorsal or supracaudal bands, blotches or crossbars; background color of belly pinkish-orange; underside of tail immaculate. Oligodon promsombuti sp. nov., whose type-locality is Khao Phanom Wang, Surat Thani Province, is also found in Trang Province, and is characterized by a maximal known SVL of 552.7 mm; 12 maxillary teeth, the posterior three enlarged; 17-17-15 dorsal scale rows; 177 ventrals; 40 divided subcaudals; a single anal; deeply forked hemipenes lacking spines; dorsal color blackish brown with nearly indistinct paravertebral stripes; no dorsal or supracaudal blotches or crossbars; background color of belly ivory, heavily speckled with subrectangular blackish blotches. We tentatively allocate both new species to the informal Oligodon-cyclurus-group. They are the 5th and 6th Oligodon species endemic to Thailand. We add Oligodon ocellatus, so far known only from Cambodia, southern Laos and southern Vietnam, to the Thai fauna, based on a specimen from Chong Mek, Ubon Ratchathani Province.
References
Angel, F. (1927) Liste des reptiles et des batraciens rapportés d’Indo-Chine par M. P. Chevey. Description d’une variété nouvelle de Simotes violaceus Cantor. Bulletin du Muséum National d’Histoire Naturelle de Paris, 33, 496–498.
Blyth, E. (1854) Notices and descriptions of various reptiles, new or little known. Journal of the Asiatic Society of Bengal, 23 (3), 287–302.
Boulenger, G.A. (1888) An account of the Reptilia obtained in Burma, North of Tenasserim, by M. L. Fea, of the Genoa Civic Museum. Annali del Museo Civico di Storia Naturale Giacomo Doria, Genova, 2 (6), 593–604.
Boulenger, G.A. (1890) The Fauna of British India, Including Ceylon and Burma. Reptilia and Batrachia. Taylor & Francis, London, xviii + 541 pp.
https://doi.org/10.5962/bhl.title.57017
Boulenger, G.A. (1914) Descriptions of new reptiles from Siam. Journal of the Natural History Society of Siam, 1 (2), 67–70.
Bourret, R. (1934a) Notes herpétologiques sur l’Indochine française. III. Ophidiens d’Annam et du Moyen Laos. Bulletin général de l’Instruction Publique, 13 (May), 167–176.
Bourret, R. (1934b) Notes herpétologiques sur l’Indochine française. IV. Sur une collection d’ophidiens de Cochinchine et du Cambodge. V. Sur Liopeltis major et ses alliés. Bulletin général de l’Instruction Publique, 13 (September), 13–30.
Campden-Main, S.M. (1970) The identity of Oligodon cyclurus (Cantor, 1839) and revalidation of Oligodon brevicauda (Steindachner, 1867) (Serpentes: Colubridae). Proceedings of the Biological Society of Washington, 82 (58), 763–765.
Cox, M.J., Hoover, M.F., Chanhome, L. & Thirakhupt, K. (2012) The snakes of Thailand, Chulalongkorn University Museum of Natural History, Bangkok, xx + 845 pp.
Cox, M.J., van Dijk, P.P., Nabhitabhata, J. & Thirakhupt, K. (1998) A photographic guide to snakes and other reptiles of Peninsular Malaysia, Singapore and Thailand. Asia Books, Bangkok, 144 pp.
David, P., Das, I. & Vogel, G. (2011) On some taxonomic and nomenclatural problems in Indian species of the genus Oligodon Fitzinger, 1826 (Squamata: Colubridae). Zootaxa, 2799 (1), 1–14.
https://doi.org/10.11646/zootaxa.2799.1.1
David, P., Nguyen, T.Q., Nguyen, T.T., Jiang, K., Chen, T., Teynié, A. & Ziegler, T. (2012) A new species of the genus Oligodon Fitzinger, 1826 (Squamata: Colubridae) from northern Vietnam, southern China and central Laos. Zootaxa, 3498 (1), 45–62.
https://doi.org/10.11646/zootaxa.3498.1.3
David, P. & Vogel, G. (2012) A new species of the genus Oligodon Fitzinger, 1826 (Squamata: Colubridae) from Pulau Nias, Indonesia. Zootaxa, 3201 (1), 58–68.
https://doi.org/10.11646/zootaxa.3201.1.4
David, P., Vogel, G. & Pauwels, O.S.G. (2008a) A new species of the genus Oligodon Fitzinger, 1826 (Squamata: Colubridae) from southern Vietnam and Cambodia. Zootaxa, 1939 (1), 19–37.
https://doi.org/10.11646/zootaxa.1939.1.3
David, P., Vogel, G. & van Rooijen, J. (2008b) A revision of the Oligodon taeniatus (Günther, 1861) group (Squamata: Colubridae), with the description of three new species from the Indochinese Region. Zootaxa, 1965 (1), 1–49.
https://doi.org/10.11646/zootaxa.1965.1.1
Dowling, H.G. (1951a) A proposed standard system of counting ventrals in snakes. British Journal of Herpetology, 1 (5), 97–99.
Dowling, H.G. (1951b) A proposed method of expressing scale reductions in snakes. Copeia, 2, 131–134.
https://doi.org/10.2307/1437542
Dowling, H.G. & Jenner, J.V. (1989) The snakes of Burma. II. Rediscovery of the type specimen of Oligodon mcdougalli with a discussion of its relationships. The Journal of the Bombay Natural History Society, 86, 46–49.
Green, M.D. (2010) Molecular phylogeny of the snake genus Oligodon (Serpentes: Colubridae), with an annotated checklist and key. Master of Science Thesis, University of Toronto, viii + 161 pp.
Green, M.D., Orlov, N.L. & Murphy, R.W. (2010) Toward a phylogeny of the kukri snakes, genus Oligodon. Asian Herpetological Research, 1 (1), 1–21.
Grismer, L.L., Wood, P.L., Quah, E.S.H., Anuar, S., Muin, M.A., Sumontha, M., Ahmad, N., Bauer, A.M., Wangkulangkul, S., Grismer, J.L. & Pauwels, O.S.G. (2012) A phylogeny and taxonomy of the Thai-Malay Peninsula Bent-toed Geckos of the Cyrtodactylus pulchellus complex (Squamata: Gekkonidae): combined morphological and molecular analyses with descriptions of seven new species. Zootaxa, 3520 (1), 1–55.
https://doi.org/10.11646/zootaxa.3520.1.1
Grossmann, W. (1992) Beitrag zur Biologie der Kukri-Natter Oligodon cyclurus smithi (Werner, 1925). Sauria, 14 (2), 3–10.
Günther, A. (1864) The reptiles of British India. Ray Society, London, xxvii + 452 pp., pls. 1–26.
Günther, A. (1865) Fourth account of new species of snakes in the collection of the British Museum. Annals and Magazine of Natural History, Series 3, 15, 89–98, pls. 2–3.
https://doi.org/10.1080/00222936508681770
Günther, A. (1868) Sixth account of new species of snakes in the collection of the British Museum. Annals and Magazine of Natural History, Series 4, 1, 413–429, pls. 17–19.
https://doi.org/10.1080/00222936808695725
Gyldenstolpe, N. (1916) Zoological results of the Swedish zoological expeditions to Siam 1911–1912 & 1914–1915. I. Snakes. Kungl. Svenska Vetenskapsakademiens Handlingar, 55 (3), 1–28.
Jiang, K., Chen, T., David, P., Vogel, G., Hou, M., Yuan, Z., Meng, Y. & Che, J. (2012) On the occurrence of Oligodon joynsoni (Smith, 1917) in China (Squamata: Colubridae). Asian Herpetological Research, 3 (4), 316–321.
https://doi.org/10.3724/SP.J.1245.2012.00316
Leong, T.M. & Grismer, L.L. (2004) A new species of kukri snake, Oligodon (Colubridae), from Pulau Tioman, West Malaysia. Asiatic Herpetological Research, 10, 12–16.
Leviton, A.E. (1953) A new snake of the genus Oligodon from Annam. Journal of the Washington Academy of Science, 43 (12), 422–424.
Leviton, A.E. (1960) Notes on the second specimen of the snake Oligodon annamensis Leviton. The Wasmann Journal of Biology, 18 (2), 305–307.
Neang, T., Grismer, L.L. & Daltry, J.C. (2012) A new species of kukri snake (Colubridae: Oligodon Fitzinger, 1826) from the Phnom Samkos Wildlife Sanctuary, Cardamom Mountains, southwest Cambodia. Zootaxa, 3388 (1), 41–55.
https://doi.org/10.11646/zootaxa.3388.1.4
Neang, T. & Hun, S. (2013) First record of Oligodon annamensis Leviton, 1953 (Squamata: Colubridae) from the Cardamom Mountains of southwest Cambodia. Herpetology Notes, 6, 271–273.
Nguyen, H.N., Tran, B.V., Nguyen, L.H., Neang, T., Yushchenko, P.V. & Poyarkov, N.A. (2020) A new species of Oligodon Fitzinger, 1826 from the Langbian Plateau, southern Vietnam, with additional information on Oligodon annamensis Leviton, 1953 (Squamata: Colubridae). PeerJ, 8, e8332.
http://doi.org/10.7717/peerj.8332
Nguyen, S.N., Nguyen, L.T., Nguyen, V.D.H., Phan, H.T., Jiang, K. & Murphy, R.W. (2017) A new species of the genus Oligodon Fitzinger, 1826 (Squamata: Colubridae) from Cu Lao Cham Islands, central Vietnam. Zootaxa, 4286 (3), 333–346.
https://doi.org/10.11646/zootaxa.4286.3.2
Nguyen, S.N., Nguyen, V.D.H., Le, S.H. & Murphy, R.W. (2016) A new species of kukri snake (Squamata: Colubridae: Oligodon Fitzinger, 1826) from Con Dao Islands, southern Vietnam. Zootaxa, 4139 (2), 261–273.
https://doi.org/10.11646/zootaza.4139.2.9
Pauwels, O.S.G., Kunya, K. & Vogel, G. (2008) Über ein Albinoexemplar von Oligodon fasciolatus (Serpentes: Colubridae) aus Thailand. Elaphe, 16 (2), 54–56.
Pauwels, O.S.G., Larsen, H., Suthanthangjai, W., David, P. & Sumontha, M. (2017) A new kukri snake (Colubridae: Oligodon) from Hua Hin District, and the first record of O. deuvei from Thailand. Zootaxa, 4291 (3), 531–548.
https://doi.org/10.11646/zootaza.4291.3.6
Pauwels, O.S.G., Wallach, V., David, P. & Chanhome, L. (2002) A new species of Oligodon Fitzinger, 1826 (Serpentes, Colubridae) from southern peninsular Thailand. Natural History Journal of Chulalongkorn University, 2 (2), 7–18.
Pellegrin, J. (1910) Description d’une variété nouvelle de l’Oligodon herberti Boulenger, provenant du Tonkin. Bulletin de la Société Zoologique de France, 35, 30–32.
https://doi.org/10.5962/bhl.part.16418
Rendahl, H. (1937) Beiträge zur Herpetologie von Birma. Arkiv för Zoologi, 29 A (10), 1–29.
Sah, A.K., Gautam, B. & Bhattarai, S. (2020) On the distribution of Cantor’s Kukri snake Oligodon cyclurus (Cantor, 1839) (Squamata: Colubridae) from Nepal. Journal of Animal Diversity, 2 (2), 1–7.
https://doi.org/10.29252/JAD.2020.2.2.1
Smith, M.A. (1916) Descriptions of three new lizards and a new snake from Siam. Journal of the Natural History Society of Siam, 2, 44–47.
Smith, M.A. (1917) Descriptions of a new snake and a new frog from Siam. Journal of the Natural History Society of Siam, 2, 276–278.
Smith, M.A. (1943) The Fauna of British India, Ceylon and Burma, including the whole of the Indo-chinese subregion. Reptilia and Amphibia. Vol. III. Serpentes. Taylor & Francis, London, xii + 583 pp.
Sumontha, M., Kunya, K., Dangsri, S. & Pauwels, O.S.G. (2017) Oligodon saiyok, a new limestone-dwelling kukri snake (Serpentes: Colubridae) from Kanchanaburi Province, western Thailand. Zootaxa, 4294 (3), 316–328.
https://doi.org/10.11646/zootaza.4294.3.2
Sutradhar, S. & Nath, A. (2013) An account on poorly known Corral red snake Oligodon kheriensis Acharji et Ray, 1936 from Assam, India. Russian Journal of Herpetology, 20 (4), 247–252.
Taylor, E.H. (1965) The serpents of Thailand and adjacent waters. The University of Kansas Science Bulletin, 45 (9), 609–1096.
Taylor, E.H. & Elbel, R.E. (1958) Contribution to the herpetology of Thailand. The University of Kansas Science Bulletin, 38 (13), 1033–1189.
https://doi.org/10.5962/bhl.part.10972
Teynié, A. & David, P. (2010) Voyages naturalistes au Laos. Les reptiles. Éditions Revoir, Nohanent, 315 pp.
Tillack, F. & Günther, R. (2009) Revision of the species of Oligodon from Sumatra and adjacent islands, with comments on the taxonomic status of Oligodon subcarinatus (Günther, 1872) and Oligodon annulifer (Boulenger, 1893) from Borneo (Reptilia, Squamata, Colubridae). Russian Journal of Herpetology, 16 (4), 265–294.
Uetz, P., Freed, P. & Hošek, J. (Eds.) (2020) The Reptile Database. Available from: http://www.reptile-database.org (accessed 11 July 2020)
van Rooijen, J., Wood, P.L., Grismer, J.L., Grismer, L.L. & Grossmann, W. (2011) Color pattern dimorphism in the colubrid snake Oligodon purpurascens (Schlegel, 1837) (Reptilia: Squamata). Russian Journal of Herpetology, 18 (3), 215–220.
Vassilieva, A.B. (2015) A new species of the genus Oligodon Fitzinger, 1826 (Squamata: Colubridae) from coastal southern Vietnam. Zootaxa, 4058 (2), 211–226.
https://doi.org/10.11646/zootaxa.4058.2.4
Vassilieva, A.B., Geissler, P., Galoyan, E.A., Poyarkov, N.A., Wayne Van Devender, R. & Böhme, W. (2013) A new species of kukri snake (Oligodon Fitzinger, 1826; Squamata: Colubridae) from the Cat Tien National Park, southern Vietnam. Zootaxa, 3702 (3), 233–246.
https://doi.org/10.11646/zootaxa.3702.3.2
Wagner, F.W. (1975) A revision of the Asian colubrid snakes Oligodon cinereus (Günther), Oligodon joynsoni (Smith), and Oligodon cyclurus (Cantor). Unpublished MS thesis, Louisiana State University, Baton Rouge, Louisiana, 97 pp.
Wall, F. (1905) Description of a new snake from Burma. Oligodon McDougalli. Journal of the Bombay Natural History Society, 16, 251–252.
Wall, F. (1914) Are not the snakes Simotes theobaldi (Günther) and Simotes beddomii (Boulenger) one and the same species? Journal of the Bombay Natural History Society, 23, 170–171.
Wall, F. & Evans, G.H. (1900) Notes on Ophidia collected in Burma from May to December, 1899. Journal of the Bombay Natural History Society, 13, 343–354.
Wall, F. & Evans, G.H. (1901) Burmese snakes. Notes on specimens including 45 species of ophidian fauna collected in Burma from 1st January to 30th June, 1900. Journal of the Bombay Natural History Society, 13, 611–620.
Werner, F. (1925) Neue oder wenig bekannte Schlangen aus dem Wiener naturhistorischen Straatsmuseum (2.) Teil. Sitzungsberichte der Wissenschaften Akademie in Wien, Mathematisch-naturwissenschaftliche Klasse, 134, 45–66.
Wüster, W. & Cox, M.J. (2002) Defensive hemipenis display in the kukri snake Oligodon cyclurus. Journal of Herpetology, 26 (2), 238–241.
https://doi.org/10.2307/1564874
Zhang, J., Jang, K., Li, P.-P., Hou, M. & Rao, D.-Q. (2011) Taxonomic revisions on genus Oligodon of China (Serpentes, Colubridae). Acta Zootaxonomica Sinica, 36 (2), 423–430.