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Pseudomonadota (synonym "Proteobacteria") is a major phylum of Gram-negative bacteria. [10] Currently, they are considered the predominant phylum within the realm of bacteria. [ 11 ] They are naturally found as pathogenic and free-living (non- parasitic ) genera. [ 11 ]
Gammaproteobacteria is a class of bacteria in the phylum Pseudomonadota (synonym Proteobacteria). It contains about 250 genera, which makes it the most genus-rich taxon of the Prokaryotes. [1] Several medically, ecologically, and scientifically important groups of bacteria belong to this class. All members of this class are Gram-negative.
Alphaproteobacteria or α-proteobacteria, also called α-Purple bacteria in earlier literature, is a class of bacteria in the phylum Pseudomonadota (formerly "Proteobacteria"). [4] The Magnetococcales and Mariprofundales are considered basal or sister to the Alphaproteobacteria .
The Betaproteobacteria comprise over 75 genera and 400 species. [2] Together, they represent a broad variety of metabolic strategies and occupy diverse environments, ranging from obligate pathogens living within host organisms to oligotrophic groundwater ecosystems.
This phylum was established as Proteobacteria by Carl Woese in 1987 calling it "purple bacteria and their relatives". [3] Purple bacteria are distributed between 3 classes: Alphaproteobacteria , Betaproteobacteria , Gammaproteobacteria [ 4 ] each characterized by a photosynthetic phenotype .
Campylobacterota are a phylum of Gram-negative bacteria. [3] Until the 2021 revision of bacterial taxonomy by the ICSP, [4] the entire phylum was classified within the Proteobacteria (synonym Pseudomonadota) as the Epsilonproteobacteria and the Desulfurellales. [5]
The Aeromonadaceae are Gram-negative bacteria. [2] The species are facultative anaerobic organisms. [3] The cells are rod-shaped. They are mostly found in estuarine waters and fresh water, also in soil and sewage.
Pseudomonas is a genus of Gram-negative bacteria belonging to the family Pseudomonadaceae in the class Gammaproteobacteria.The 348 members of the genus [2] [3] demonstrate a great deal of metabolic diversity and consequently are able to colonize a wide range of niches and hosts.