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Columella aspera
''Columella aspera'' is a species of very small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the vertigo snails.
==Description==
The 2.0-2.5 x 1.3-1.4 mm. shell has 4-5 whorls and the spire tapers towards the apex. The aperture is simple without teeth . The colour is dark grey brown or horny brown.The surface is not shiny and finely and regularly striated.It is more coarsely sculptured than the very similar ''Columella edentula''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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