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Charisma compacta : ウィキペディア英語版 | Charisma compacta
''Charisma compacta'' is a species of extremely small sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔Marshall, B. (2013). Charisma compacta Hedley, 1915. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=718885 on 2014-03-10〕 ==Description== The height of the shell attains 1.9 mm, its diameter 2 mm. The shell is solid and has a turbinate shape. Its colour is pale cream. The four whorls are rather loosely coiled and separated by channelled sutures. The spire-whorls are smooth. The body whorl is sculptured with about twenty regularly spaced, sharp, spiral grooves. The umbilicus measures about one-eighth of the shell's diameter; its margin is smooth and rounded. The aperture-side of the umbilicus shows an obscure funicle. The circular aperture of the shell is descending. The inner lip is slightly expanded. The outer lip is simple. 〔 ( Hedley C. (1915), Studies on Australian Mollusca. Part XII; Proceedings of the Linnean Society of New South Wales v. 39 ) 〕
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