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''Truncatella'' is a genus of very small land snails with an operculum, terrestrial gastropod mollusks in the family Truncatellidae. These small and minute snails live on land, very close to seawater. They walk with a strange looping action, and the adults have truncated shells. Many of the species are small enough to be considered micromollusks. ''Truncatella'' is the type genus of the family Truncatellidae. ==Distribution and habitat== This genus occurs in tropical and subtropical areas. The various species of ''Truncatella'' are pantropical in distribution, with a few exceptions such as ''Truncatella truncatula'' and ''Truncatella subcylindrica''. Most of the species in this genus live in a habitat that is neither fully terrestrial nor fully marine: they live under plant debris near high tide level, where they are occasionally wetted with seawater by waves. A small minority of the species are fully terrestrial. These small snails are typically found associated with drifts of plant material, where their eggs are deposited.〔Ross, Landon T. (1969). Notes on the life history of ''Truncatella caribaeensis'' Reeve. American Malacological Union Ann. Rept. 1969:35-36.〕 The adaptations of these land snails to the terrestrial environment are not so perfect as they are in the more usual pulmonate land snails, and their terrestrial adaptations may in fact be comparatively recent.〔Rosenberg, Gary (1996). Independent evolution of terrestriality in Atlantic truncatellid gastropods. Evolution 50(2): 682-693.〕 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「Truncatella (gastropod)」の詳細全文を読む スポンサード リンク
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