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Volvocales
In taxonomy, the Volvocales, also known as Chlamydomonadales, are an order of flagellate or pseudociliate green algae, specifically of the Chlorophyceae.〔See the NCBI (webpage on Chlamydomonadales ). Data extracted from the (【引用サイトリンク】 title=NCBI taxonomy resources )〕 Volvocales can form planar or spherical colonies. These vary from ''Gonium'' (4 to 32 cells) up to ''Volvox'' (500 cells or more). Each cell has two flagella, and is similar in appearance to ''Chlamydomonas'', with the flagella throughout the colony moving in coordination.
Both asexual and sexual reproduction occur. In the former, cells divide until they form new colonies, which are then released. In the smaller forms typically all cells are involved, but larger forms have anterior vegetative and posterior reproductive cells. Sexual reproduction varies from isogamy (both genders produce flagellate gametes of equal size) to oogamy (one gender produces a much larger, non-motile gamete).
The classification of the Volvocales varies. Very often they are taken to include the orders Chlamydomonadales and Dunallielales, which contain closely related unicellular flagellates, as suborders.
==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「Volvocales」の詳細全文を読む
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