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Aeromonas hydrophila.jpg
Aeromonas hydrophila
Scientific classification
Domain: Bacteria
Phylum: Proteobacteria
Class: Gammaproteobacteria


The Aeromonadales are an order of Proteobacteria, with 10 genera in two families. [1] The species are anaerobic. [2] The cells are rod-shaped. Some species of this order are motile by a single polar flagellum; others are not motile.

Proteobacteria phylum of Gram-negative bacteria

Proteobacteria is a major phylum of gram-negative bacteria. They include a wide variety of pathogens, such as Escherichia, Salmonella, Vibrio, Helicobacter, Yersinia, Legionellales and many other notable genera. Others are free-living (non-parasitic) and include many of the bacteria responsible for nitrogen fixation.

An anaerobic organism or anaerobe is any organism that does not require oxygen for growth. It may react negatively or even die if free oxygen is present.

Related Research Articles

Campylobacterales order of bacteria

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.

Burkholderiales order of bacteria

The Burkholderiales are an order of Proteobacteria. Like all Proteobacteria, they are Gram-negative. They include several pathogenic bacteria, including species of Burkholderia, Bordetella, and Ralstonia. They also include Oxalobacter and related genera, which are unusual in using oxalic acid as their source of carbon.. Other well-studied genera include Alcaligenes, Cupriavidus, Achromobacter, Comamonas, Delftia, Massilia, Duganella, Janthinobacterium, Polynucleobacter, non-pathogenic Paraburkholderia, Caballeronia, Polaromonas, Thiomonas, Collimonas, Hydrogenophaga, Sphaerotilus, Variovorax, Acidovorax, Rubrivivax and Rhodoferax, and Herbaspirillum.

Parvularcula bermudensis is a marine bacterium which was identified in 2003 in the western Sargasso Sea in the Atlantic Ocean. It forms a deep branch in the Alpha Proteobacteria, distinct from the other orders.

Comamonadaceae family of bacteria

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 order of bacteria

Desulfovibrionales belong 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.

Alteromonadales order of bacteria

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.

The Piscirickettsiaceae are a family of Proteobacteria. All species are aerobes found in water. The species Piscirickettsia salmonis is a fish pathogen and causes piscirickettsiosis in salmonid fishes. It lives in cells of infected hosts and cannot be cultured on artificial media. Piscirickettsia salmonis is nonmotile, whereas the other five genera are motile by using a single flagellum.

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 Colwelliaceae are a family of Proteobacteria. This family consists of facultative anaerobes and has non-motile and motile members.

Acidithiobacillus is a genus of the Acidithiobacillia in the "Proteobacteria". Like all "Proteobacteria", Acidithiobacillus spp. are Gram-negative. Some members of this genus were classified as Thiobacillus spp., before they were reclassified in 2000.

Betaproteobacteria class of bacteria

Betaproteobacteria are a class of gram-negative bacteria, and one of the eight classes of the phylum Proteobacteria.

Marinobacterium is a genus of Proteobacteria found in sea water. The cells are rod-shaped and are motile by using one polar flagellum.

Comamonas is a genus of Proteobacteria . Like all Proteobacteria, they are Gram-negative bacteria. Comamonas species are aerobic organisms and motile using bipolar or polar tufts of one to five flagella.

The Oceanimonas are a genus of marine Proteobacteria. They are, like all Proteobacteria, gram-negative. The rod-shaped, motile organisms are aerobic and chemoorganotroph.

Caballeronia glathei is a Gram-negative soil bacterium. It is motile by using one polar flagellum. The bacterium is a pathogen for Asian rice.

Thauera is a genus of Gram-negative bacteria in the family Zoogloeaceae of the order Rhodocyclales of the Betaproteobacteria. The genus is named for the German microbiologist Rudolf Thauer. Most species of this genus are motile by flagella and are mostly rod-shaped. The species occur in wet soil and polluted freshwater.

Conserved signature inserts and deletions (CSIs) in protein sequences provide an important category of molecular markers for understanding phylogenetic relationships. CSIs, brought about by rare genetic changes, provide useful phylogenetic markers that are generally of defined size and they are flanked on both sides by conserved regions to ensure their reliability. While indels can be arbitrary inserts or deletions, CSIs are defined as only those protein indels that are present within conserved regions of the protein.

The species of the genus Aquabacterium are motile, rod-shaped, Gram-negative, oxidase-positive, catalase-negative bacteria which were isolated from drinking water biofilms in Berlin. Identified species include Aquabacterium citratiphilum, Aquabacterium parvum, and Aquabacterium commune. Three bacterial strains isolated from biofilms of the Berlin drinking water system were characterized with respect to their morphological and physiological properties and their taxonomic position. Phenotypically, the bacteria investigated were motile, Gram-negative rods, oxidase-positive and catalase-negative, and contained polyalkanoates and polyphosphate as storage polymers. They displayed a microaerophilic growth behaviour and used oxygen and nitrate as electron acceptors, but not nitrite, chlorate, sulfate, or ferric iron. The substrates metabolized included a broad range of organic acids, but no carbohydrates at all. The three species can be distinguished from each other by their substrate use, ability to hydrolyse urea and casein, cellular protein patterns, and growth on nutrient-rich media, as well as their temperature, pH, and NaCl tolerances. Phylogenetic analysis, based on 16S rRNA gene sequence comparison, revealed that the isolates are affiliated to the beta 1-subclass of Proteobacteria. The isolates constitute three new species with internal levels of DNA relatedness ranging from 44.9 to 51.3%. It is proposed that a new genus, Aquabacterium gen. nov., should be created, including Aquabacterium citratiphilum sp. nov., Aquabacterium parvum sp. nov., and Aquabacterium commune sp. nov. The type species of the new genus is Aquabacterium commune.


  1. Aeromonadales Archived April 22, 2012, at the Wayback Machine . - List of Prokaryotic names with Standing in Nomenclature
  2. George M. Garrity: Bergey's Manual of Systematic Bacteriology . 2. Auflage. Springer, New York, 2005, Volume 2: The Proteobacteria, Part B: The Gammaproteobacteria.