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Biology LibreTexts

Halorhodospira halophila

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Halorhodospira halophila (formerly Ectothiorhodospira halophila) is an extremely halophilic purple bacterium that was formally a member of the Ectothiorhodospira genus until recently reclassified. Phylogenetically, Halorhodospira halophila is associated within the gamma subdivision of the phylum Proteobacteria and is known to be phototrophic and Gram-negative. It is considered to be “one of the most halophilic eubacteria known.” Its halophilic nature allows for it to be present in conditions that often have been thought to be too harsh for bacteria, and it is found proliferating in saturated salts such as crystallizer ponds (a hypersaline environment where sodium chloride precipitates) that have a salinity of 25% or higher. This importantly shows that harsh environments once thought to be exclusive to archaea actually contain bacteria as well.


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