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Research Articles NAT Research articles NAT. HIST. BULL. SIAM. SOC. 60(1): 9–22. 2014 A NEW SPECIES OF TYLOTOTRITON (AMPHIBIA: URODELA: SALAMANDRIDAE) FROM CENTRAL MYANMAR Kanto Nishikawa1,*, Masafumi Matsui1 and Dingqi Rao2 ABSTRACT We describe a new species of Tylototriton from Taunggyi, Shan State, central Myanmar, based on molecular and morphological evidence. The new species, Tylototriton shanorum, is classified as a member of the subgenus Tylototriton. The species differs morphologically from all known congeners by having the combination of dull-colored markings, weakly protruding dorsolateral bony ridges on head, narrow and weakly segmented vertebral ridge, and narrow vomerine tooth series. The taxonomic relationship between T. verrucosus and T. shanjing is briefly discussed based on the molecular phylogeny obtained in this study. Key words: Tylototriton, morphology, new species, Myanmar INTRODUCTION The salamandrid genus Tylototriton is widely distributed from eastern Himalaya, Indochina, to central and southern China, and currently includes a total of 19 species/ subspecies: T. asperrimus, T. broadoridgus, T. daweishanensis, T. hainanensis, T. kweichowensis, T. lizhengchangi, T. notialis, T. panhai, T. pseudoverrucosus, T. shanjing, T. taliangensis, T. uyenoi, T. vietnamensis, T. verrucosus pulcherrima, T. verrucosus verrucosus, T. wenxianensis dabienicus, T. wenxianensis wenxianensis, T. yangi, and T. ziegleri (after NISHIKAWA ET AL., 2013a). The species of Tylototriton are divided into two subgenera, Tylototriton DUBOIS & RAFFAËLLI, 2009 (= the T. verrucosus group [FEI ET AL., 2005]) and Yaotriton DUBOIS & RAFFAËLLI, 2009 (= the T. asperrimus group [FEI ET AL., 2005]). The subgenus Tylototriton includes T. daweishanensis, T. kweichowensis, T. pseudove,rrucosus, T. shanjing, T. taliangensis, T. uyenoi, T. verrucosus (also v. pulcherrima), and T. yangi, while Yaotriton includes T. asperrimus, T. broadoridgus, T. hainanensis, T. lizhenchangi, T. notialis, T. panhai, T. vietnamensis, T. wenxianensis (also w. dabienicus), and T. ziegleri (after NISHIKAWA ET AL., 2013a). Recently, NISHIKAWA ET AL. (2013a) described two new species from Thailand: one from the subgenus Tylototriton and the other from the subgenus Yaotriton. In that paper, they noted the presence of two more lineages in the subgenus Tylototriton based on results of molecular phylogenetic analyses. These two lineages, one from central Myanmar and the 1 Graduate School of Human and Environmental Studies, Kyoto University, Yoshida Nihonmatsu-cho, Sakyo-ku, Kyoto 606–8501, Japan 2 Kunming Institute of Zoology, The Chinese Academy of Sciences, 32 Jiaochang Donglu, Kunming, Yunnan 650223, China * Corresponding author. E-mail: [email protected] Received 17 February 2014; accepted 8 May 2014. 9 10 KANTO NISHIKAWA, MASAFUMI MATSUI AND DINGQI RAO other from Nepal, were tentatively identified asT. verrucosus and their taxonomic status has been undetermined. In the present paper, we examined morphology and molecular characteristics of one of them, the lineage from central Myanmar, and describe it as a new species. MATERIALS AND METHODS DNA Sequence We obtained sequence data of NADH dehydrogenase subunit 2 region (ND2) of mitochondrial DNA (mtDNA) from tissue samples preserved in 99 % ethanol. The present ND2 region of mtDNA has been proven to be useful for delineating species in the genus Tylototriton (NISHIKAWA ET AL., 2013a, b). Methods for DNA extraction and amplification and sequencing of the DNA fragment are the same as those reported by NISHIKAWA ET AL. (2013a, b). We constructed phylogenetic trees using our own new sequences of six specimens of Tylototriton from Shan, Myanmar, and Yunnan, China. For comparisons, 12 DNA sequences of Tylototriton and one sequence each of Echinotriton andersoni, Pleurodeles waltl, and Notophthalmus viridescens were obtained from GenBank (Table 1, Fig. 1). The optimum substitution models were selected by Kakusan 4 (TANABE, 2011). We then constructed phylogenetic trees by Bayesian inference (BI) and maximum likelihood (ML) methods using MrBayes v3.1.2 (HUELSENBECK & RONQUIST, 2001) and TREEFINDER ver. Mar. 2011 (JOBB, 2011), respectively. The criterion used for model selection was AIC. The best substitution models for BI and ML were the general time reversible model (GTR: TAVARÉ, 1986) + G, and the J3 (JOBB, 2011) with gamma shape parameter (G), respectively. Two independent runs of four Markov chains were conducted for ten million generations. We sampled one tree every 100 generations and calculated a consensus topology for 70,000 trees after discarding the first 30,001 trees (burn-in = 3,000,000). For the Bayesian analysis, we considered posterior probabilities (bpp) 95 % or greater as significant support( LEACHÉ & REEDER, 2002). The robustness of the ML tree was tested using bootstrap analysis (FELSENSTEIN, 1985) with 1000 replicates. We regarded tree topologies with bootstrap values (bs) of 70 % or greater as sufficiently supported (HUELSENBECK & HILLIS, 1993). Pairwise comparisons of uncorrected sequence divergences (p-distance) were calculated using MEGA5 (TAMURA ET AL., 2011). Morphological Comparisons We compared morphometric characters of the Myanmar species with those of topotypes of T. v. verrucosus and the type series of T. uyenoi. The Myanmar species has been identified as the former species (STUArt ET AL., 2010; NISHIKAWA ET AL., 2013a). Further, only the latter species has dull-colored markings in the subgenus Tylototriton. The remaining taxa of the subgenus have more brightly-colored markings on head, body, and/or tail, except for T. daweishanensis [blackish body like T. v. verrucosus]: see below and NISHIKAWA ET AL. [2013a]). We also used specimens of the other congeners (16 species/subspecies; see Appendix 1) deposited in the California Academy of Sciences (CAS), Chengdu Institute of Biology, Chinese Academy of Sciences (CIB), Graduate School of Human and Environmental Studies, Kyoto University Table 1. Samples of Tylototriton species and related species used for molecular analyses. CAS = California Academy of Sciences; CIB = Chengdu Institute of Biology; KUHE = Graduate School of Human and Environmental Studies, Kyoto University; MVZ = Museum of Vertebrate Zoology, University of California, Berkeley; NMNS = National Museum of Natural Science, Taiwan. Sample Species or subspecies Voucher Locality GenBank Source no. accession no. A NEW SPECIESOF NEW A Ingroup 1 Tylototriton asperrimus CIB 200807055 Jinxiu, Guangxi, China KC147815 SHEN ET AL. (2012) 2 T. kweichowensis MVZ 230371 Daguan, Yunnan, China DQ517851 WEISROCK ET AL. (2006) 3 T. panhai - Phu Hin Rong Kla NP, Phitsanulok, Thailand AB830735 NISHIKAWA ET AL. (2013b) T. shanjing ISHIKAWA ET AL. 4 NMNS 3682 Jingdong, Yunnan, China AB830721 N (2013b) TYLOTOTRITON 5 T. shanjing KUHE 42348 Myanmar (Pet trade) AB769544 NISHIKAWA ET AL. (2013a) 6 T. shanjing KUHE 42842 Myanmar (Pet trade) AB830722 NISHIKAWA ET AL. (2013b) 7 T. taliangensis KUHE 43361 Unknown (Pet trade) AB769543 NISHIKAWA ET AL. (2013a) T. uyenoi NISHIKAWA ET AL. (2013b) 8 KUHE 19147 Doi Suthep, Chiang Mai, Thailand AB830733 9 T. verrucosus pulcherrima KUHE 46406 Yunnan, China (Pet trade) AB830738 NISHIKAWA ET AL. (2013b) MYANMAR FROM CENTRAL 10 T. verrucosus verrucosus KIZ 201306055 Husa, Yunnan, China AB922818 This study 11 T. verrucosus verrucosus KIZ 201306056 Husa, Yunnan, China AB922819 This study 12 T. verrucosus verrucosus KIZ 201306058 Husa, Yunnan, China AB922820 This study 13 T. verrucosus verrucosus KIZ 201306059 Husa, Yunnan, China AB922821 This study 14 T. verrucosus verrucosus CAS 230899 Taunggyi, Shan, Myanmar HM770087 STUArt ET AL. (2010) 15 T. verrucosus verrucosus CAS 230933 Taunggyi, Shan, Myanmar AB922822 This study 16 T. verrucosus verrucosus CAS 230940 Taunggyi, Shan, Myanmar AB922823 This study 17 T. verrucosus verrucosus MVZ no number Nepal DQ517854 WEISROCK ET AL. (2006) 18 T. yangi KUHE 42282 China (Pet trade) AB769546 NISHIKAWA ET AL. (2013a) Outgroup Echinotriton andersoni AB769545 NISHIKAWA ET AL. (2013a) 19 KUHE no number Nago, Okinawa, Japan 11 20 Pleurodeles waltl MVZ 162384 Rabat, Morocco DQ517813 WEISROCK ET AL. (2006) 21 Notophthalmus viridescens MVZ 230959 St. Charles, Missouri, USA DQ517795 WEISROCK ET AL. (2006) NP: National Park 12 KANTO NISHIKAWA, MASAFUMI MATSUI AND DINGQI RAO Figure 1. A map showing localities of the samples of Tylototriton. For sample number, refer to Table 1. Samples of 5–7, 9, and 18 obtained from pet traders are not shown. (KUHE), Herpetological collection of the National Museum of Nature and Science, Tokyo (NSMT-H), National Museum of Natural Science, Taiwan (NMNS), Thailand Natural History Museum (THNHM), and Vietnam National Museum of Nature (VNMN) for comparisons (Appendix 1). The following 13 measurements were taken for morphometric comparisons (character definitions not mentioned below are given in NISHIKAWA ET AL. [2011]): SVL (snout-vent length) from tip of snout to anterior tip of vent; HL (head length); HW (head width); MXHW (maximum head width); IND (internarial distance); AGD (axilla-groin distance); TRL (trunk length); TAL (tail length) from anterior tip of vent to tail tip; VL (vent length); FLL (forelimb length); HLL (hindlimb length); VTW (vomerine tooth series width): the greatest width of vomerine tooth series; VTL (vomerine tooth series length): the greatest length of vomerine tooth series. All measurements were taken to the nearest 0.1 mm with a dial caliper. We used a stereoscopic binocular microscope when necessary. The
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