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Littorina
''Littorina'' is a genus of small sea snails, marine gastropod molluscs in the family Littorinidae, the winkles or periwinkles. 〔 WoRMS (2011). Littorina Férussac, 1822. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138135 on 2011-04-15 〕
These small snails live in the tidal zone of rocky shores.
==Overview==
In Europe there are about nine species in this genus, one of which is the rough periwinkle, ''Littorina saxatilis'' (Olivi, 1792). Another closely related (supposed) species ''Littorina tenebrosa'' (Montagu 1802) was thought to be distinct because of its different ecological requirements, but current studies have shown that it is not at all clear whether the two are indeed separate species or whether ''L. tenebrosa'' is perhaps merely an ecotype (an ecological form) of ''L. saxatilis''.〔Gosling, E.M. (2002). ''The periwinkle as a model in biodiversity studies: a geneticist's view.'' in Marine Biodiversity in Ireland and Adjacent Waters. Ulster Museum. publication no. 8〕
''Littorina'' has given its name to the Littorina Sea, the geologic precursor of the Baltic Sea.
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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