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Aplexa
''Aplexa'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. ==Shell description== These small snails are quite distinctive, because they have shells that are sinistral, which means that if you hold the shell such that the spire is pointing up, then the aperture is on the left-hand side. The shells of ''Aplexa'' species have a long and large aperture, a relatively high and pointed spire, and no operculum. The shells are thin and corneous and rather transparent.
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「Aplexa」の詳細全文を読む
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