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''Leptothyra'' is a genus of sea snails, marine gastropod mollusks in the family Colloniidae. This genus was previously placed in the family Turbinidae. The name ''Leptothyra'' is generally attributed to Pease (1869), and the name "Lepttothyra Pease, 1869" is usually treated as a valid name for small colloniines. Although Leptothyra is a junior objective synonym of ''Homalopoma'', the species usually treated as valid in that genus are provisionally listed in WoRMS under "Leptothyra sensu Pease, 1869", pending a taxonomic/nomenclatural reappraisal.〔 ''Leptothyra'' J. G. Cooper, 1867 is now considered a synonym of the genus ''Homalopoma'' Carpenter, 1864 〔Bouchet, P. (2014). Leptothyra J. G. Cooper, 1867. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=751372 on 2014-06-12〕 ==Description== The small, solid shell has a turbinate or globose shape. The operculum is multispiral with a subcentral nucleus and concave in the centre outside. The main character distinguishing ''Collonia'' from ''Leptothyra'' seems to be the peculiar peristome of the former.〔(G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Leptothyra」の詳細全文を読む スポンサード リンク
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