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''Dreissena'' is a genus of small freshwater mussels in the family Dreissenidae. The exact taxonomy of the species within the genus ''Dreissena'' is, however, uncertain. As Kantor et al commented, "...the Russian specialists on freshwater molluscs appeared to be “splitters” comparing with their western colleagues. This sometimes leads to extreme differences in opinion on species number and taxonomy of some groups. For example, Graf () recently analyzed the number of species of Unionoidea of Palearctic recognised by Russian malacologists (156 species in 34 genera) and western specialists (45 species in 16 genera). Most of the groups are still awaiting the critical re-assessment." ==Species== Possible list of species within the genus ''Dreissena'':〔〔(【引用サイトリンク】 url=http://www.zin.ru/projects/caspdiv/caspian_molluscs.html )〕〔(【引用サイトリンク】 title=Taxon Details: ''Dreissena'' Van Beneden 1835 )〕〔The IUCN Red List of Threatened Species. Version 2014.2. * ''Dreissena blanci'' * ''Dreissena bugensis'', the quagga mussel (sometimes considered a subspecies of ''D. rostriformis'') * ''Dreissena caspia * * ''Dreissena caspia caspia'' * * ''Dreissena caspia pallasi'' * ''Dreissena elata elata'' * ''Dreissena obtusecarinata'' * ''Dreissena polymorpha'', the zebra mussel * * ''Dreissena polymorpha polymorpha'' * * ''Dreissena polymorpha andrusovi'' * ''Dreissena presbensis'' * ''Dreissena rostiformis'' * * ''Dreissena rostriformis compressa'' * * ''Dreissena rostriformis distincta'' * * ''Dreissena rostriformis grimmi'' * * ''Dreissena rostriformis pontocaspica'' * ''Dreissena stankovici'' 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「Dreissena」の詳細全文を読む スポンサード リンク
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