The Alteromonadales are an order of

Pseudomonadota Pseudomonadota (synonym Proteobacteria) is a major phylum of Gram-negative bacteria. The renaming of phyla in 2021 remains controversial among microbiologists, many of whom continue to use the earlier names of long standing in the literature. The ...

. Although they have been treated as a single family, the

Alteromonadaceae The Alteromonadaceae are a family of Pseudomonadota.George M. Garrity: '' Bergey's Manual of Systematic Bacteriology''. 2. Auflage. Springer, New York, 2005, Volume 2: ''The Proteobacteria, Part B: The Gammaproteobacteria'' They are now one of ...

, 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 A flagellum (; ) is a hairlike appendage that protrudes from certain plant and animal sperm cells, and from a wide range of microorganisms to provide motility. Many protists with flagella are termed as flagellates. A microorganism may have f ...

. Most of the species are marine.

References

* George M. Garrity: ''Bergey's Manual of Systematic Bacteriology''. 2. Auflage. Springer, New York, 2005, Volume 2: ''The Proteobacteria, Part B: The Gammaproteobacteria'' * Elena P. Ivanova, Sebastien Flavier, and Richard Christen. (2004). Phylogenetic relationships among marine ''Alteromonas''-like proteobacteria: emended description of the family Alteromonadaceae and proposal of Pseudoalteromonadaceae ''fam. nov.'', Colwelliaceae'' fam. nov., ''Shewanellaceae'' fam. nov., ''Moritellaceae'' fam. nov., ''Ferrimonadaceae'' fam. nov., ''Idiomarinaceae'' fam. nov.'' and Psychromonadaceae'' fam. nov. '', ''International Journal of Systematic and Evolutionary Microbiology'' 54: 1773–1788. Gammaproteobacteria {{Alteromonadales-stub