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Navicula
''Navicula'' is a genus of boat-shaped algae — primarily aquatic, eukaryotic, photosynthetic organisms, ranging in size from a single cell.
''Navicula'' is a diatom. The ''Navicula'' genus of diatoms comprises over 1,200 species.〔(【引用サイトリンク】url=http://www.algaebase.org/search/genus/detail/?genus_id=pdae871a111622f14&sk=0 )〕 ''Navicula'' is Latin for "small ship", and also a term in English for a boat-shaped incense-holder.〔Oxford English Dictionary, "Navicula. 3"〕
Navicula play an important role in global ecology, producing about a quarter of all the oxygen within Earth's biosphere and serving as keystone species in the food chain of many environments where they provide a staple for the diets of many aquatic species.
==Mobility==
Navicula diatoms are known for their ability to creep about on each other and on hard surfaces such as microscope slides.〔() Youtube video〕 〔() Folia Microbiol (Praha). 2007;52(2):127-34. ''Survival and motility of diatoms Navicula grimmei and Nitzschia palea affected by some physical and chemical factors.'' Gupta S1, Agrawal SC.〕 〔J Microbiol Methods. 2013 Mar;92(3):349-54. doi: 10.1016/j.mimet.2013.01.006. Epub 2013 Jan 18. ''Semi-circular microgrooves to observe active movements of individual Navicula pavillardii cells.'' Umemura K1, Haneda T, Tanabe M, Suzuki A, Kumashiro Y, Itoga K, Okano T, Mayama S.〕 〔() M.A. Harper & J.F. Harper (1967) ''Measurements of diatom adhesion and their relationship with movement'', (British Phycological Bulletin ), 3:2, 195-207, DOI: 10.1080/00071616700650051〕 It is thought that around the outside of the navicula's shell is a girdle of protoplasm that can flow and thus act as a tank track.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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