Proteobacteria is a major phylum of Gram-negative bacteria. They include a wide variety of pathogenic genera, such as Escherichia, Salmonella, Vibrio, Helicobacter, Yersinia, Legionellales, and many others. Others are free-living (nonparasitic) and include many of the bacteria responsible for nitrogen fixation.
The Campylobacterales are an order of Proteobacteria which make up the epsilon subdivision, together with the small family Nautiliaceae. Like all Proteobacteria, they are Gram-negative. Most of the species are microaerophilic.
The Rhodocyclaceae are a family of gram-negative bacteria. They are given their own order in the beta subgroup of Proteobacteria, and include many genera previously assigned to the family Pseudomonadaceae.
The Comamonadaceae are a family of the Betaproteobacteria. Like all Proteobacteria, they are Gram-negative. They are aerobic and most of the species are motile via flagella. The cells are curved rod-shaped.
Desulfovibrionales are a taxonomic order of bacteria belonging to the Phylum of Proteobacteria, with four families. Like all Proteobacteria, they are Gram-negative. The majority are sulfate-reducing, with the exception of Lawsonia and Bilophila. All members of this order are obligately anaerobic. Most species are mesophilic, but some are moderate thermophiles.
The Syntrophobacterales are an order of Proteobacteria, with two families. All genera are strictly anaerobic. Many of the family Syntrophobacteraceae are sulfate-reducing. Some species are motile by using one polar flagellum.
The Aeromonadales are an order of Proteobacteria, with 10 genera in two families. The species are anaerobic. The cells are rod-shaped. Some species of this order are motile by a single polar flagellum; others are not motile.
The Neisseriaceae are a family of Proteobacteria, within the Neisseriales order. While many organisms in the family are mammalian commensals or part of the normal flora, the genus Neisseria includes two important human pathogens, specifically those responsible for gonorrhea and many cases of meningitis. As a group, the Neisseriaceae are strictly aerobic and Gram-negative, occur mainly in pairs (diplococci), and typically do not have flagella.
The Cardiobacteriaceae are a family of Proteobacteria, given their own order. They are Gram-negative and rod-shaped, with diameters around 0.5 to 1.7 μm and lengths from 1–6 μm.
The Alteromonadales are an order of Proteobacteria. Although they have been treated as a single family, the Alteromonadaceae, they were divided into eight by Ivanova et al. in 2004. The cells are straight or curved rods. They are motile by the use of a single flagellum. Most of the species are marine.
Oceanospirillaceae is a family of Proteobacteria. Most genera in this family live in environments with high concentrations of salt; they are halotolerant or halophilic. They are marine, except Balneatrix which is found in fresh water.
The Alteromonadaceae are a family of Proteobacteria. They are now one of several families in the order Alteromonadales, including Alteromonas and its closest relatives. Species of this family are mostly rod-like shaped and motile by using one polar flagellum.
The Desulfobacteraceae are a family of Proteobacteria. They reduce sulfates to sulfides to obtain energy and are strictly anaerobic. They have a respiratory and fermentative type of metabolism. Some species are chemolithotrophic and use inorganic materials to obtain energy and use hydrogen as their electron donor.
Betaproteobacteria are a class of Gram-negative bacteria, and one of the eight classes of the phylum Proteobacteria.
Achromobacter is a genus of bacteria, included in the family Alcaligenaceae in the order Burkholderiales. The cells are Gram-negative straight rods and are motile by using one to 20 peritrichous flagella. They are strictly aerobic and are found in water and soils. They have also been identified as a contaminant in laboratory cell cultures. They have been identified as opportunistic human pathogens in people with certain immunosuppressive conditions such as cystic fibrosis, cancer and kidney failure.
Oxalobacter is a genus of bacteria in the Oxalobacteraceae family. The species are chemoorganotrophs and strictly anaerobic. They are found in rumens of animals such as cattle and in feces of other animals and humans. Some are marine and some have been isolated from fresh water.
Duganella zoogloeoides is a bacterium of the genus Duganella in the Oxalobacteraceae family. In a phylogenetic analysis of Zoogloea ramigera, it has been shown to belong to the beta subclass of the class Proteobacteria which means Z. ramigera should be reclassified as a new taxon name, Duganella zoogloeoides.
The Marinilabiliaceae are a family of bacteria.
Aequorivita is a Gram-negative and strictly aerobic bacterial genus from the family of Flavobacteriaceae.
Actimicrobium is a Gram-negative, strictly aerobic and non-motile genus of bacteria in the family of Oxalobacteraceae with one known species.
