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Umbonella sismondae : ウィキペディア英語版 | Umbonella sismondae
''Umbonella sismondae'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. ==Description== The height of the shell attains 4 mm, its diameter also 4 mm. The small, imperforate, greenish shell has a conoid shape. It contains minute, transverse striae. The apex is obtuse. The 4½ whorls increase slowly in size. They are slightly convex and have a distinct suture. The body whorl takes up half of the total length. Its base is angulated and shows on its lower parts four concentric ribs. The oblique aperture is subcircular. 〔 (Issel A. (1869), Malacologia del Mar Rosso : ricerche zoologiche e paleontologiche / di Arturo Issel ; memoria letta al congresso dei Naturalisti Italiani in Vicenza nel 1868 ) 〕
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「Umbonella sismondae」の詳細全文を読む
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