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''Chaetoceros'' is probably the largest genus of marine planktonic diatoms with approximately 400 species described, although a large number of these descriptions are no longer valid. It is often very difficult to distinguish between different ''Chaetoceros'' species.〔C.H. von Quillfeldt., (2001). ''Identification of Some Easily Confused Common Diatom Species in Arctic Spring Blooms.'' Botanica Marina Vol. 44: 375–389〕 Several attempts have been made to restructure this large genus into subgenera and this work is still in progress.〔Tomas, C. R., Hasle G. R., Syvertsen, E. E., Steidinger, K. A., Tangen, K., Throndsen, J., Heimdal, B. R., (1997). ''Identifying Marine Phytoplankton'', Academic Press.〕〔Rines J. E. B., Theriot E. C., (2003). ''Systematics of Chaetocerotaceae (Bacillariophyceae). I. A phylogenetic analysis of the family'', Phycological research 51: 83-98.〕 However, most of the effort to describe species has been focused in boreal areas, and the genus is cosmopolitan, so there are probably many tropical species still undescribed.〔J.E.B. Rines, P. Boonruang and E.C. Theriot., (2000).'' Chaetoceros phuketensis sp. nov. (Bacillariophyceae): a new species from the Andaman Sea''. Phycological Research 48 (3): 161–168.〕 ==Description== The genus ''Chaetoceros'' were first described by Ehrenberg in 1844. Cells are more or less rectangular in girdle view. Cells are usually elliptical in valve view. Opposite setae of adjacent cells touch near their origin. 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「Chaetoceros」の詳細全文を読む スポンサード リンク
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