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Chrysostoma
''Chrysostoma'' is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails.〔Bouchet, P. (2012). ''Chrysostoma'' Swainson, 1840. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=225491 on 2012-11-23〕〔Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). ISBN 0-915826-22-4. XII, 195 pp.〕 ==Description== The solid, thick shell has a globose shape. The spire is very short . The aperture is rounded. The parietal wall bears a heavy callus which wholly or almost covers the narrow umbilicus.〔(Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia )〕
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