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Margarella expansa
''Margarella expansa'' is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.〔Bouchet, P.; Rosenberg, G. (2012). ''Margarella expansa''. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=533026 on 2012-12-07〕〔Zelaya D.G. (2004) The genus Margarella Thiele, 1893 (Gastropoda: Trochidae) in the southwestern Atlantic Ocean. The Nautilus 118(3): 112-120.〕〔Intergovernmental Oceanographic Commission (IOC) of UNESCO. The Ocean Biogeographic Information System (OBIS)〕
==Description==
The shell grows to a height of 14.1 mm. The thin, imperforate shell has a depressed-conoidal shape. It is shining, of a light olivaceous tint or somewhat tinged with pink. Its surface is smooth. The acute spire is conoidal. The sutures are slightly impressed. The shell contains about 42 rapidly widening whorls. The large body whorl is rounded at the periphery and a little impressed or margined below the suture. The large aperture is rounded and angular above, green and iridescent inside. The columellar margin is a little straightened. The umbilico-columellar tract is slightly excavated.〔(Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) (described as ''Photinula expansa'')〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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