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''Neoplanorbis tantillus'' is a species of very small air-breathing freshwater snail, an aquatic gastropod mollusk in the family Planorbidae, the ram's horn snails. This species is endemic to the United States. In 2012, it has been declared extinct by the IUCN Red List of Threatened Species.〔 The shells of this species appear to be dextral in coiling, but as is the case in all planorbids, the shell is actually sinistral. The shell is carried upside down with the aperture on the right, and this makes it appear to be dextral. == Original description == Species ''Neoplanorbis tantillus'' was originally described by Henry Augustus Pilsbry in 1906.〔 Type locality is Coosa River near or in Wetumpka, Alabama. Pilsbry's original text (the type description) reads as follows: Note: "preceding species" in the description means ''Amphigyra alabamensis'', because these two species were newly described in the same work. 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「Neoplanorbis tantillus」の詳細全文を読む スポンサード リンク
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