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Diloma zelandica
''Diloma zelandica'' is a species of sea snail, a marine gastropod mollusc in the family Trochidae, the top snails or top shells.〔 Bouchet, P. (2010). Diloma zelandica (Quoy & Gaimard, 1834). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=546852 on 2011-07-03 〕
==Description==
The height of the shell attains 20 mm, its diameter 25 mm. The imperforate shell is depressed and has an orbiculate-conoidal shape. The six whorls are separated by impressed sutures. The whorls are slightly convex, greenish-black and shining. They are spirally sulcate, the sulci about 5 on the penultimate whorl. The body whorl is much dilated, slightly depressed above, rounded in the middle, very obliquely striate, obsoletely transversely sulcate, slightly convex beneath. The aperture is subrhomboidal and lirate within. The acute lip is green. The basal margin is thickened within. The white columella is compressed and arcuate. The columellar callus is broadly expanded, subdepressed at the place of the umbilicus.〔 (Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) (described as ''Monodonta atrovirens'')〕
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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