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Pyramidula umbilicata : ウィキペディア英語版 | Pyramidula umbilicata
''Pyramidula umbilicata'' is a species of very small air-breathing land snail, a terrestrial pulmonate gastropod mollusk or micromollusc in the family Pyramidulidae. == Shell description == The width of the shell is up to 2.9 mm, the height is up to 1.7 mm.〔Gittenberger E. & Bank R. A. (1996). "A new start in ''Pyramidula'' (Gastropoda Pulmonata: Pyramidulidae)". ''Basteria'' 60: 71-78.〕 The shell is low conical (much broader than high) and tightly coiled and has very fine growth lines. The colour is red brown becoming more grey with age. The umbilicus is c. 1/3 of the shell diameter.
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「Pyramidula umbilicata」の詳細全文を読む
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