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''Ringicella'' is a genus of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Odontostomidae. Adult snails of this genus have an extremely unusual shell morphology, very similar to that found in the genus ''Anostoma'' Fischer von Waldheim, 1807, of which this genus was previously considered to be merely a subgenus. The adult snails in this genus carry their shells upside down, with the spire or apex at the bottom, and the umbilicus at the top.〔 == Shell description == The shell of ''Ringicella'' is very similar to that of ''Anostoma''. Shells of the genus ''Ringicella'' have an additional feature: the angular lamella and upper suprapalatal fold are concrescent, forming a perforation in the lip at its upper end.〔 In addition, the apertural rim incorporates a small tube, which communicates with the interior of the shell.〔http://content.lib.washington.edu/cgi-bin/viewer.exe?CISOROOT=/fishimages&CISOPTR=48529&CISORESTMP=&CISOVIEWTMP=&CISOMODE=thumb〕 The width of adult shells varies from 18 to 25 mm.〔 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「Ringicella」の詳細全文を読む スポンサード リンク
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