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''Biomphalaria straminea'' is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails. This snail is a medically important pest,〔 because an intermediate host for the parasite ''Schistosoma mansoni'' and a vector of schistosomiasis.〔Borda C. E. & Rea M. J. F. (March 2007) "''Biomphalaria tenagophila'' potencial vector of ''Schistosoma mansoni'' in the Paraná River basin (Argentina and Paraguay)". ''Memórias do Instituto Oswaldo Cruz'' 102(2): 191-195. (PDF ).〕 The history of these discoveries was summarized by Paraense (2001).〔Paraense W. L. (2001) "The Schistosome Vectors in the Americas". ''Memórias do Instituto Oswaldo Cruz'' 96(Supplement): 7-16. (text ), (PDF )〕 The shell of this species, like all planorbids is sinistral in coiling, but is carried upside down and thus appears to be dextral. == Distribution == ''Biomphalaria glabrata'' is a Neotropical〔 species. It occurs in: * Caribbean: Saint Lucia - reported since 1993〔Pointier J. P. (1993) "The introduction of ''Melanoides tuberculata'' (Mollusca: Thiaridae) to the island of Saint Lucia (West Indies) and its role in the decline of ''Biomphalaria glabrata'', the snail intermediate host of ''Schistosoma mansoni''". ''Acta Tropica'' 54(1):13-18. (abstract ).〕 * northeast of Brazil This species has recently expanded its native range.〔.〕 As an introduced species, it occurs in: * Hong Kong - firstly collected in 1973〔 (PDF ).〕 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「Biomphalaria straminea」の詳細全文を読む スポンサード リンク
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