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''Biomphalaria tenagophila'' is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails. This species is medically important pest,〔 because of transferring the disease intestinal schistosomiasis. (Intestinal schistosomiasis is the most widespread of all types of schistosomiasis). The parasite ''Schistosoma mansoni'', which ''Biomphalaria'' snails carry, infects about 83.31 million people worldwide. The shell of this species, like all planorbids is sinistral in coiling, but is carried upside down and thus appears to be dextral. == Taxonomy == ''Biomphalaria tenagophila'' was originally discovered and described under the name ''Planorbis tenagophilus'' by the French naturalist Alcide d'Orbigny in 1835.〔15px d’Orbigny A. (1835) Synopsis terrestrium et fluviatilium molluscoum, in suo per Americam meridionalem itinere collectorum. ''Magasin de zoologie'' 5(62): 1-44. (Page 26 ).〕 Orbigny (1835) referred its distribution to Corrientes Province, Argentina and to Santa Cruz Department, Bolivia (referred as "Santa-Cruz et Chiquitos"). But Orbigny himself later limited its distribution to Ensenada, Buenos Aires Province, Argentina in 1837.〔 Subspecies recognized in this species include: * ''Biomphalaria tenagophila tenagophila'' (d’Orbigny, 1835) * ''Biomphalaria tenagophila guaibensis'' Paraense, 1984 - ''Biomphalaria tenagophila guaibensis'' can be distinguished from the nominal subspecies according to the details on the reproductive system only.〔 There are also three "old-style" proposals of subspecies, based on shell characteristics:〔 * ''Planorbis tenagophilus chemnitziana'' Beck, 1837 - this name is based on the catalog for the shell in Museum of Copenhagen, but without description.〔 * ''Planorbis tenagophilus orbignyana'' Beck, 1837 - the same situation as in ''P. t. chemnitziana''〔 * ''Australorbis bahiensis megas'' Pilsbry, 1951〔Pilsbry H. A. (1951) "Notes on some Brazilian Planorbidae". ''Nautilus'' 65(1): 3-6.〕 History of discoveries summarized Paraense (2001).〔Paraense W. L. (2001) "The Schistosome Vectors in the Americas". ''Memórias do Instituto Oswaldo Cruz'' 96(Supplement): 7-16. (text ), (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 tenagophila」の詳細全文を読む スポンサード リンク
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