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Colpidium colpoda
''Colpidium colpoda'' are free-living ciliate protozoa commonly found in many freshwater environments including streams, rivers, lakes and ponds across the world. ''Colpidium colpoda'' is also frequently found inhabiting wastewater treatment plants. This species is used as an indicator of water quality and waste treatment plant performance.
==History and physical characteristics==
The first record of ''Colpidium colpoda'' was in 1829 by Losana. It was more thoroughly described by Christian Gottfried Ehrenberg in his two volume publication ''Die Infusionsthierchen als vollkommene Organismen'' (which roughly translates to “The Infusoria as Perfect Organisms”) in 1838. The species was described in detail by Ganner and Foissner in 1989. ''C. colpoda'' is considered an intermediate sized ciliate, typically between 16 and 30 μm long and are dorso-ventrally flattened with several rows of cilia running along the length of the cell.〔(【引用サイトリンク】url=http://eol.org/pages/485190/overview )〕 Like many ciliates, it is a heterotrophic bacterivore that ingests bacteria through an oral groove. ''C. colpoda'' reproduces asexually every 4–6 hours, with variation in division rates arising from environmental conditions and the identity of the available bacterial food source.
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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