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Volvulina
In taxonomy, ''Volvulina'' is a genus of colonial green algae, specifically of the Volvocaceae.〔See the NCBI (webpage on Volvulina ). Data extracted from the (【引用サイトリンク】 title=NCBI taxonomy resources )〕 The colony (coenobium) is broadly ellipsoidal or spherical and consists of a fixed number of cells, usually 16 in mature individuals (rarely 4, 8 or 32). The cells are located at perphery of the coenobium and separated from each other by being embedded in a swollen sack. The cell body is lens-shaped or half spherical when mature with two flagella. The chloroplast is dish- or bowl-shaped. Pyrenoids may be present or absent, the stigma large. The nucleus is centrally located and there may be 4 to 8 contractile vacuoles. Sexual reproduction is by isogamy.〔(Protist Images: ''Volvulina''. )〕 ==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「Volvulina」の詳細全文を読む
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