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Alphaproteobacteria is a class of bacteria in the phylum Pseudomonadota (formerly "Proteobacteria"). The Magnetococcales and Mariprofundales are considered basal or sister to the Alphaproteobacteria. The Alphaproteobacteria are highly diverse and possess
The phylum Pseudomonadota encompasses classes Acidithiobacilia, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Hydrogenophilia, and Zetaproteobacteria. The phylum includes a wide variety of pathogenic genera, such as Escherichia , Salmonella , Vibrio , Yersinia , Legionella , and many others. [15]
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Is Alphaproteobacteria a phylum?
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The Pelagibacterales are an order in the Alphaproteobacteria composed of free-living marine bacteria that make up roughly one in three cells at the ocean's surface. [2] [3] [4] Overall, members of the Pelagibacterales are estimated to make up between a quarter and a half of all prokaryotic cells in the ocean. [5]
The Rickettsiales, informally called rickettsias, are an order of small Alphaproteobacteria. They are obligate intracellular parasites, and some are notable pathogens, including Rickettsia, which causes a variety of diseases in humans, and Ehrlichia, which causes diseases in livestock.
Alphaproteobacteria were formerly thought to be the free-living organisms most closely related to mitochondria. Later research indicates that mitochondria are most closely related to Pelagibacterales bacteria, in particular, those in the SAR11 clade.
References. Pelagibacteraceae. The Pelagibacteraceae are a family in the Alphaproteobacteria composed of free-living marine bacteria. [3] Alphaproteobacteria is a type of proteobacteria, and it can be divided into several different orders, including Rhodobacterales, Rhodospirillales, and Caulobacterales.
Rhodobacter group. Roseobacter group. alpha-3 proteobacteria. The Rhodobacteraceae are a family of Pseudomonadota in the order Rhodobacterales within the alpha subgroup. [1] Like all Pseudomonadota, they are gram-negative. It contains chemoorganotrophs and photoheterotrophs bacteria. Many occur in aquatic habitats.
