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Tylomelania
''Tylomelania'' is a genus of freshwater snails which have an operculum, aquatic gastropod mollusks in the family Pachychilidae.
A sister group (the closest relative) of ''Tylomelania'' is genus ''Pseudopotamis'' (2 species living on the Torres Strait Islands).〔von Rintelen T., Stelbrink B. Marwoto R. M. & Glaubrecht M. (2014). "A Snail Perspective on the Biogeography of Sulawesi, Indonesia: Origin and Intra-Island Dispersal of the Viviparous Freshwater Gastropod ''Tylomelania''". ''PLoS ONE'' 9(6): e98917. .〕 ''Tylomelania'' and ''Pseudopotamis'' split in the Middle Miocene c. 19.5 Mya.〔
== Distribution ==
These freshwater snails are endemic to Sulawesi in Indonesia,〔 with the vast majority restricted to Lake Poso and the Malili Lake system (consisting of Matano and Towuti, and the smaller Lontoa (Wawantoa), Mahalona, Masapi).〔von Rintelen T., von Rintelen K. & Glaubrecht M. (2010). "The species flock of the viviparous freshwater gastropod ''Tylomelania'' (Mollusca: Cerithioidea: Pachychilidae) in the ancient lakes of Sulawesi, Indonesia: the role of geography, trophic morphology and colour as driving forces in adaptive radiation." pp. 485-512 in: Glaubrecht, M. & Schneider H. eds. (2010). ''Evolution in Action: Adaptive Radiations and the Origins of Biodiversity''. Springer Verlag, Heidelberg, Germany.〕
They probably cannot live at an altitude above about 700 m.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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