Title Diversity and Evolution of Tree Snails of the Genus Amphidromus In

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Title Diversity and Evolution of Tree Snails of the Genus Amphidromus In

Diversity and evolution of tree snails of the genus Title Amphidromus in Thailand and adjecent regions Author(s) Panha, Somsak 琉球大学21世紀COEプログラム第1回国際シンポジウム「 Citation サンゴ礁島嶼系の生物多様性：アジア太平洋地域との連携を目指して」: 14 Issue Date 2005-03-11 URL http://hdl.handle.net/20.500.12000/2183 Rights Tropical Biodiversity Okinawa 2005 Session 2: Biodiversity in molecular scales Diversity and evolution of tree snails of the genus Amphidromus in Thailand and adjacent regions Somsak Panha Faculty of Science, Chulalongkorn University, Bangkok, Thailand The genus Amphidromus Albers, 1850 is one of the most prominent tree snails in Tropical Asia, and characterizes the terrestrial molluscan fauna for this region, just like the genus Liguus for the Caribbean Islands and Florida, Achatinella for Hawaii, and Patula for the southern Pacific islands. Our observations of specimens of Amphidromus from a broad area of Southeast Asia (Thailand, Malaysia, Borneo, Singapore, and Indonesia) showed remarkable intrageneric variations in various phenotypic characters, such as col oration and direction of coiling of shells, anatomy of genitalia, and radula morphology. These variations, while raising a number of interesting questions regarding the evolution of Amphidromus, lead to serious dif ficulties in delimiting species within the genus appropriately. Indeed, species taxonomy of Amphidromus, chiefly or exclusively depending on shell coloration, has long been suffering serious confusions. Thus, I attempted a much more comprehensive approach to the apparent diversity of Amphidromus by combining analysis of the mitochondrial 16S ribosomal RNA gene sequence data and cladistic analysis of morphologi cal characters. The major purpose of this study was to test some previous hypotheses on the taxonomy and phylogeny of certain morphologically defined forms of the genus. The results, while supporting monophyly of Amphidromus, yielded a number of new insights regarding the process of diversification, taxonomic and evolutionary significances of differential shell coilings, and the adequacy of the currently prevailing sub- generic classification. Okinawa, Japan.

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