. Bulletin of the Natural History Museum Zoology. 108 SANDERS Fig. 1 Geographic origin of specimens used in multivariate analysis. S = Trimeresurus sumatranus; H = Trimeresurus hageni; U = unidentified specimens. Shading represents the known distribution of T. hageni and/or T. sumatranus. Table 1 List of OTUs and sample size for each sex. OTU Sample Size Males Females Thailand, West Malaysia, Singapore North Sumatra 1 (Medan) North Sumatra 2 (Medan) Central Sumatra 1 (Padang) Central Sumatra 2 (Padang) South Sumatra 1 (Palembang) Nias Siberut East Malaysia Betong (south Thailand) T


. Bulletin of the Natural History Museum Zoology. 108 SANDERS Fig. 1 Geographic origin of specimens used in multivariate analysis. S = Trimeresurus sumatranus; H = Trimeresurus hageni; U = unidentified specimens. Shading represents the known distribution of T. hageni and/or T. sumatranus. Table 1 List of OTUs and sample size for each sex. OTU Sample Size Males Females Thailand, West Malaysia, Singapore North Sumatra 1 (Medan) North Sumatra 2 (Medan) Central Sumatra 1 (Padang) Central Sumatra 2 (Padang) South Sumatra 1 (Palembang) Nias Siberut East Malaysia Betong (south Thailand) Total 6 15 1 1 0 1 1 1 0 1 0 1 1 10 3 3 4 18 1 0 7 51 Museum Acronyms BMNH The Natural History Museum, London, formerly the British Museum (Natural History), London FMNH Field Museum of Natural History, Chicago IMR Institute of Medical Research, Kuala Lumpur KSP Sabah Park Zoological Museum, Mount Kinabalu National Park, Sabah MCZ Museum of Comparative Zoology, Harvard MHNG Museum d'Histoire Naturelle de Geneva, Switzerland NMBA Naturhistorisches Museum Basel, Switzerland NMW Naturhistorisches Museum Vienna, Austria QSMI Queen Saovabha Memorial Institute, Bangkok PH Perhelitan, Kuala Lumpur ZRC Raffles Museum of Biodiversity Research, National University of Singapore, Singapore West Malaysia and Singapore and those normally assigned to T. sumatranus from East Malaysia. The Siberut OTU and the single specimens from Nias and northern Sumatra are closest to the main- land T. hageni population. The specimens from Betong, Thailand and central Sumatra are closest to the Borneo OTU, but are well differentiated on CV2. Analysis of females also shows strong differentiation between the Thailand, West Malaysia and Singapore OTU and the Borneo OTU. The Siberut and Nias specimens are phenotypically close to T. hageni from Thailand, West Malaysia and Singapore. Specimens from north and south Sumatra are also closely affiliated to this mainland population. The specimens from central Sumatra ar


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