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・ Umbogrella
・ Umboi Island
・ Umboi tube-nosed fruit bat
・ Umbonella
・ Umbonella sismondae
・ Umbonia crassicornis
・ Umbonia spinosa
・ Umbonium
・ Umbonium callosum
・ Umbonium conicum
・ Umbonium costatum
・ Umbonium elegans
・ Umbonium eloiseae
・ Umbonium giganteum
・ Umbonium moniliferum
Umbonium sagittatum
・ Umbonium suturale
・ Umbonium thomasi
・ Umbonium vestiarium
・ Umbopilio
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Umbonium sagittatum : ウィキペディア英語版
Umbonium sagittatum

''Umbonium sagittatum'' is a species of very small sea snail, a marine gastropod mollusk or micromollusk in the family Trochidae, the top snails. 〔 (H. Pilsbry (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) 〕
==Description==
The height of the shell attains 4 mm, its diameter 6 mm. The shell is smaller and more depressed than is the case in ''Umbonium vestiarium''. The color is fawn or flesh-colored, with a row of arrow-shaped dark spots at the periphery, and another row a short distance below the suture. The shell has about 4¼ whorls, which widen rapidly. The body whorl is depressed. The spire is lower than in ''Umbonium vestiarium''. The basal callus is convex, circular, and smaller than in ''Umbonium vestiarium'' and it is either white or slate-colored. The surface of the shell is perfectly smooth and polished. 〔

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「Umbonium sagittatum」の詳細全文を読む



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