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Paulinella
''Paulinella'' is a genus of about nine〔(【引用サイトリンク】 accessdate = 2008-01-28 )〕 species of freshwater amoeboids. Its most famous member is the photosynthetic ''P. chromatophora'' which has recently (evolutionarily speaking) taken on a cyanobacterium as an endosymbiont. This is striking because the chloroplasts of all other known photosynthetic eukaryotes derive ultimately from a single cyanobacterium endosymbiont which was taken in probably over a billion years ago in an ancestral archaeplastidan (and subsequently adopted into other eukaryote groups, by further endosymbiosis events). The ''P. chromatophora'' symbiont was related to the ''Prochlorococcus'' and ''Synechococcus'' cyanobacteria (sister to the group consisting of the living members of those two genera).〔 Other than the symbiont, ''P. chromatophora'' is closely related to the heterotrophic ''P. ovalis''. == References ==
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「Paulinella」の詳細全文を読む
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