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Marstonia
''Marstonia'' is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae. ==Distribution == Species in the genus ''Marstonia'' are distributed in springs, streams and lakes in eastern North America.〔 Most of these species have extremely narrow geographic ranges and consequently have become a focus of conservation activities; two are federally listed as endangered and others are variously listed by state wildlife agencies.〔
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「Marstonia」の詳細全文を読む
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