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''Oncomelania'' is a genus of very small tropical freshwater snails, aquatic gastropod mollusks in the family Pomatiopsidae. These ''Oncomelania'' snails are distantly related to the marine periwinkle, and more closely related to the small marine snails of the family Rissoidae. ==Species== There are two〔Kameda Y. & Kato M. (2011). "Terrestrial invasion of pomatiopsid gastropods in the heavy-snow region of the Japanese Archipelago". ''BMC Evolutionary Biology'' 11: 118. .〕 species in the genus ''Oncomelania'': * ''Oncomelania hupensis'' Gredler, 1881〔 - type species,〔 this polytypic species has a number of subspecies * ''Oncomelania minima'' P. Bartsch, 1936〔 Woodruff et al. (1999) recognized also the following species: * ''Oncomelania lindoensis'' Davis & Carney, 1973 - from Lake Lindu, Sulawesi〔Woodruff D. S., Carpenter M. P., Upatham E. S. & Viyanant V. (1999). "Molecular Phylogeography of ''Oncomelania lindoensis'' (Gastropoda: Pomatiopsidae), the Intermediate Host of ''Schistosoma Japonicum'' in Sulawesi". ''Journal of Molluscan Studies 65(1): 21-31. .〕 Japanese Red List Data Book (2006) recognizes also the following additional species: * ''Oncomelania shini'' - as Vulnerable species in Japan〔 ("ヨナクニカタヤマガイ" ). 日本のレッドデータ検索システム (Red List Data Book ), accessed 17 July 2011.〕 * ''Oncomelania sakuyamai'' - with no conservation status evaluated in Japan〔 ("サクヤマカワツボ" ). 日本のレッドデータ検索システム (Red List Data Book ), accessed 17 July 2011.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oncomelania」の詳細全文を読む スポンサード リンク
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