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Microtis (gastropod) : ウィキペディア英語版 | Microtis (gastropod)
''Microtis'' is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails.〔Bouchet, P. (2012). ''Microtis'' H. Adams & A. Adams, 1850. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=512300 on 2012-11-23〕 ==Description== The spiral shell is suborbicular and depressed. It has two tuberculated ridges. The spire is slightly projecting. The aperture is very large, and wider than long. Its interior is pearly within. The columellar margin is spiral and visible as far as the apex of the spire. There is no operculum.〔(G.W. Tryon (continued by Pilsbry) (1890) Manual of Conchology XII Stomatellidae, Scissurellidae, Pleurotomariidae, Haliotidae, Scutellinidae, Addisoniidae, Cocculinidae, Fissurellidae )〕
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