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Calliostoma gualterianum : ウィキペディア英語版 | Calliostoma gualterianum
''Calliostoma gualterianum'', common name Gualtieri's top shell, is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae. ==Description== The size of the shell varies between 10 mm and 17 mm. The imperforate, polished, solid shell has a conical-elevated shape with 9 whorls. It is yellowish-brown or olive, clouded with brown, the earlier 4 whorls dark bluish or greenish. The shell is spirally sulcate, the 2d whorl somewhat granulate. The rest of the whorls are smooth, flat, and with a narrow supra-sutural fasciole, which on the body whorl is not developed. The periphery is rounded angular. The base of the shell is smooth except for about 4 fine riblets around the axis. The aperture is smooth within. The nacreous columella is a trifle swollen at its base, and either purple or whitish inside.〔(Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia )〕
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