Terrabacteria
A Terrabacteria is a bacteria that ...
- See: Glidobacteria, Scanning Electron Micrograph, Actinomyces Israelii, Actinobacteria, Abditibacteriota, Armatimonadetes, Chloroflexi (Phylum), Cyanobacteria-Melainabacteria Group, Cyanobacteria, Candidatus Margulisbacteria, Candidatus Melainabacteria, Candidatus Saganbacteria.
References
2021
- (Wikipedia, 2021) ⇒ https://en.wikipedia.org/wiki/Terrabacteria Retrieved:2021-12-25.
- Terrabacteria is a taxon containing approximately two-thirds (6,157 sp.) of prokaryote species, including those in the gram positive phyla (Actinobacteria and Firmicutes) as well as the phyla Cyanobacteria, Chloroflexi, and Deinococcus-Thermus.
It derives its name (terra = "land") from the evolutionary pressures of life on land. Terrabacteria possess important adaptations such as resistance to environmental hazards (e.g., desiccation, ultraviolet radiation, and high salinity) and oxygenic photosynthesis. Also, the unique properties of the cell wall in gram-positive taxa, which likely evolved in response to terrestrial conditions, have contributed toward pathogenicity in many species. These results now leave open the possibility that terrestrial adaptations may have played a larger role in prokaryote evolution than currently understood.
Terrabacteria was proposed in 2004 for Actinobacteria, Cyanobacteria, and Deinococccus-Thermus and was expanded later to include Firmicutes and Chloroflexi. Other phylogenetic analyses have supported the close relationships of these phyla. Most species of prokaryotes not placed in Terrabacteria were assigned to the taxon Hydrobacteria (3,203 sp.), in reference to the moist environment inferred for the common ancestor of those species. Terrabacteria and Hydrobacteria were inferred to have diverged approximately 3 billion years ago, suggesting that land (continents) had been colonized by prokaryotes at that time. Together, Terrabacteria and Hydrobacteria form a large group containing 99% (9,360 sp.) of all Eubacteria known by 2009, and placed in the taxon Selabacteria, in allusion to their phototrophic abilities (selas = light)[1] (though some recent analyses disproved the non-Selabacteria to be outside it, making it the total bacterial domain).
Terrabacteria should not be confused with the recently described taxon “Glidobacteria", which includes only some members of Terrabacteria but excludes Firmicutes and Actinobacteria, and is not supported by molecular phylogenetic data.
- Terrabacteria is a taxon containing approximately two-thirds (6,157 sp.) of prokaryote species, including those in the gram positive phyla (Actinobacteria and Firmicutes) as well as the phyla Cyanobacteria, Chloroflexi, and Deinococcus-Thermus.
- ↑ Battistuzzi, F. U., Hedges, S. B. 2009. Eubacteria. Pp. 106-115 in The Timetree of Life, S. B. Hedges and S. Kumar, Eds. (Oxford University Press, New York, 2009). http://www.timetree.org/book.php.