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Calliostoma jucundum : ウィキペディア英語版 | Calliostoma jucundum
''Calliostoma jucundum'' is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.〔Rosenberg, G. (2012). ''Calliostoma jucundum'' (Gould, 1849). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532526 on 2012-12-07〕 ==Description== (Original description by Gould) The size of the shell varies between 9.5 mm and 23 mm. The small, solid shell has a low conical shape. It is composed of about six conical whorls, with a slight vertical portion at base. The whorls are girdled with fine, uniform, beaded lines, the alternate ones being generally smaller, sometimes even not beaded, and the two basal ones surrounding the vertical portion being larger. The base of the shell is a little convex, similarly sculptured with about twelve concentric lines, gradually diminishing from the center to the circumference. The umbilical region is colorless, not perforated, and with a groove-like impression beside the columella. The aperture has a rhomboidal-orbiculate shape. The arcuate columella is smooth. The lip is simple. The colors are arranged in radiating flammules, alternately white, strawberry-red, and pale flesh-color, gradually shaded into each other. On the base the dark or light-red are distributed along the granules in a somewhat articulated manner. The shell is nacreous beneath.〔(Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia )〕
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「Calliostoma jucundum」の詳細全文を読む
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