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Cirsonella extrema : ウィキペディア英語版 | Cirsonella extrema
''Cirsonella extrema'' is a species of sea snail, a marine gastropod mollusk in the family Skeneidae. ==Description== The height of the yellowish white shell attains 2.7 mm, its diameter 2.9 mm. The spire contains 3½ whorls. The round aperture is somewhat oblique. The peristome has a thickened callus, expanded on the left side. Its top is attached to the penultimate whorl. it covers mostly the umbilicus. The brownish operculum is rather thick and consists of polygyrous spirals.〔(J. Thiele, Die antarktischen Schnecken und Muscheln p.191-192; Deutsche Südpolar-Expedition 1912 )〕
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「Cirsonella extrema」の詳細全文を読む
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