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Gibbula nivosa : ウィキペディア英語版 | Gibbula nivosa
''Gibbula nivosa'', common name the Maltese top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. ==Description== The size of the shell varies between 6 mm and 9 mm. The umbilicate shell has an orbiculate-conoidal shape. It is gray with almost round spots. It is sulcatei in a crosswise direction and longitudinally substriate. The aperture is almost round. The columella is flexuous. The base of the shell is rounded. 〔 (Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) 〕
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