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''Borysthenia'' is a genus of small freshwater snails with an operculum, aquatic gastropod mollusks in the family Valvatidae, the valve snails. The aperture of ''Borysthenia'' is not circular.〔("Genus summary for ''Borysthenia''" ). AnimalBase, last modified 28 February 2009, accessed 22 May 2011.〕 Animals are ovoviviparous.〔 ==Species== The genus ''Borysthenia'' contains the following species: * † ''Borysthenia goldfussiana'' (Wüst, 1901) * † ''Borysthenia intermedia'' Kondrashov, 2007 - from the Middle Pleistocene of Oka-Don Plain〔Kondrashov P. E. (2007). "New gastropod species from the Pleistocene of the Upper Don basin". ''Paleontological Journal'' 41(5): 513-519. .〕 * ''Borysthenia menkeana'' (Jelski, 1863) * ''Borysthenia naticina'' (Menke, 1845) - type species as ''Valvata jelskii'' Crosse, 1863〔 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「Borysthenia」の詳細全文を読む スポンサード リンク
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