| Bacillales | |
|---|---|
Scientific classification  | |
| Domain: | Bacteria |
| Phylum: | Bacillota |
| Class: | Bacilli |
| Order: | Bacillales Prévot 1953 |
| Type genus | |
| Bacillus | |
| Families | |
| Synonyms | |
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The Bacillales are an order of Gram-positive bacteria, placed within the Bacillota. [1] The Bacillales are the most productive order of the phylum Firmicutes . [2] Representative genera include Bacillus , Listeria and Staphylococcus . [3] [4]
Pseudomonadota is a major phylum of Gram-negative bacteria. The renaming of several prokaryote phyla in 2021, including Pseudomonadota, remains controversial among microbiologists, many of whom continue to use the earlier name Proteobacteria, of long standing in the literature. The phylum Proteobacteria includes a wide variety of pathogenic genera, such as Escherichia, Salmonella, Vibrio, Yersinia, Legionella, and many others. Others are free-living (non-parasitic) and include many of the bacteria responsible for nitrogen fixation.
The Bacillota are a phylum of bacteria, most of which have gram-positive cell wall structure. The renaming of phyla such as Firmicutes in 2021 remains controversial among microbiologists, many of whom continue to use the earlier names of long standing in the literature.
Deinococcota is a phylum of bacteria with a single class, Deinococci, that are highly resistant to environmental hazards, also known as extremophiles. These bacteria have thick cell walls that give them gram-positive stains, but they include a second membrane and so are closer in structure to those of gram-negative bacteria.
Chrysiogenaceae is a family of bacteria.
Mollicutes is a class of bacteria distinguished by the absence of a cell wall. The word "Mollicutes" is derived from the Latin mollis, and cutis. Individuals are very small, typically only 0.2–0.3 μm in size and have a very small genome size. They vary in form, although most have sterols that make the cell membrane somewhat more rigid. Many are able to move about through gliding, but members of the genus Spiroplasma are helical and move by twisting. The best-known genus in the Mollicutes is Mycoplasma. Colonies show the typical "fried-egg" appearance.
The Listeriaceae are a family of Gram-positive bacteria that includes two genera: Listeria and Brochothrix. They are short, rod-shaped bacteria that are aerobic or facultatively anaerobic. Spores are not formed, but under stress these bacteria can form filaments. Some species, namely Listeria monocytogenes, can cause human and animal listeriosis. While not all bacteria in the Listeriaceae family are considered a danger to humans, some are strongly associated with food borne illness or microbial spoilage, so they remain a topic of interest in agricultural industries.
The Bacillaceae are a family of gram-positive, heterotrophic, rod-shaped bacteria that may produce endospores. Motile members of this family are characterized by peritrichous flagella. Some Bacillaceae are aerobic, while others are facultative or strict anaerobes. Most are not pathogenic, but Bacillus species are known to cause disease in humans.
The Paenibacillaceae are a family of Gram-positive bacteria.
The Enterococcaceae are a family of Gram-positive bacteria placed in the order Lactobacillales. Representative genera include Enterococcus, Melissococcus, Pilibacter, Tetragenococcus, and Vagococcus. In this family are some important lactic acid bacteria which produce lactic acid as the major metabolic end product.
Mycoplasmatota is a phylum of bacteria that contains the class Mollicutes. The phylum was originally named "Tenericutes". Notable genera include Mycoplasma, Spiroplasma, Ureaplasma, and Candidatus Phytoplasma.
Bergey's Manual of Systematic Bacteriology is the main resource for determining the identity of prokaryotic organisms, emphasizing bacterial species, using every characterizing aspect.
Bacterial taxonomy is subfield of taxonomy devoted to the classification of bacteria specimens into taxonomic ranks.
The Negativicutes are a class of bacteria in the phylum Bacillota, whose members have a peculiar cell wall with a lipopolysaccharide outer membrane which stains gram-negative, unlike most other members of the Bacillota. Although several neighbouring Clostridia species also stain gram-negative, the proteins responsible for the unusual diderm structure of the Negativicutes may have actually been laterally acquired from Pseudomonadota. Additional research is required to confirm the origin of the diderm cell envelope in the Negativicutes.
'The All-Species Living Tree' Project is a collaboration between various academic groups/institutes, such as ARB, SILVA rRNA database project, and LPSN, with the aim of assembling a database of 16S rRNA sequences of all validly published species of Bacteria and Archaea. At one stage, 23S sequences were also collected, but this has since stopped.
Negativicoccus is a Gram-negative and anaerobic genus of bacteria from the family of Veillonellaceae.
Aminobacterium is a Gram-negative genus of bacteria from the family of Synergistaceae.
Halobacteroides is a Gram-negative strictly anaerobic, chemoorganotrophic genus of bacteria from the family of Halobacteroidaceae.
Trichococcus is a mesophilic and psychrotolerant genus of bacteria from the family of Carnobacteriaceae. Trichococcus bacteria have the ability to utilize sugars, sugar alcohols and polysaccharides. Some species of Trichococcus species where transferred from the genera Lactosphaera and Ruminococcus.
Orenia is a genus of bacteria from the family of Halobacteroidaceae. Orenia bacteria occurs in saline environments.
Halocella is a Gram-negative, non-spore-forming, obligately anaerobic and moderately halophilic genus of bacteria from the family of Halanaerobiaceae with one known species. Halocella cellulosilytica has been isolated from the hypersaline lagoon of the Lake Syvash on the Crimea.
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