| Actinomycetia | |
|---|---|
 | |
| Scanning electron micrograph of Actinomyces israelii . | |
Scientific classification  | |
| Domain: | Bacteria |
| Phylum: | Actinomycetota |
| Class: | Actinomycetia (Stackebrandt et al. 1997) Salam et al. 2020 [1] |
| Type genus | |
| Actinomyces Harz 1877 (Approved Lists 1980) | |
| Orders | |
See text | |
| Synonyms | |
| |
The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) [3] and National Center for Biotechnology Information (NCBI). [4]
The Actinomycetota are a phylum of all gram-positive bacteria. They can be terrestrial or aquatic. They are of great economic importance to humans because agriculture and forests depend on their contributions to soil systems. In soil they help to decompose the organic matter of dead organisms so the molecules can be taken up anew by plants. While this role is also played by fungi, Actinomycetota are much smaller and likely do not occupy the same ecological niche. In this role the colonies often grow extensive mycelia, like a fungus would, and the name of an important order of the phylum, Actinomycetales, reflects that they were long believed to be fungi. Some soil actinomycetota live symbiotically with the plants whose roots pervade the soil, fixing nitrogen for the plants in exchange for access to some of the plant's saccharides. Other species, such as many members of the genus Mycobacterium, are important pathogens.
The family Micrococcaceae includes bacterial genera of Gram positive cocci that inhabit the air and skin, such as Micrococcus luteus.
The Acidimicrobiaceae are a family of Actinomycetota.
The Bifidobacteriaceae are the only family of bacteria in the order Bifidobacteriales. According to the 16S rRNA-based LTP release 106 published by 'The All-Species Living Tree' Project, the order Bifidobacteriales is a clade nested within the suborder Micrococcineae, also the genus Bifidobacterium is paraphyletic to the other genera within the family, i.e. the other genera are nested within Bifidobacterium.
The Coriobacteriales are an order of Actinomycetota.
Rubrobacter is a genus of Actinomycetota. It is radiotolerant and may rival Deinococcus radiodurans in this regard.
The Halanaerobiales are an order of bacteria placed within the class Clostridia, and encompassing two families, the Halanaerobiaceae and the Halobacteroidaceae. Originally placed within the highly polyphyletic class Clostridia, according to the NCBI and LPSN, it is now thought to lie outside the Bacillota. Halanaerobiales are halophilic obligate anaerobes with a fermentative or homoacetogenic metabolism.
The Pseudonocardiaceae are a family of bacteria in the order Actinomycetales and the only member of the suborder Pseudonocardineae.
The Glycomycetaceae are a family of bacteria.
The Cryptosporangiaceae are the only family of the order Cryptosporangiales, which is a part of the phylum Actinomycetota.
Promicromonosporaceae is an Actinomycete family.
Dermabacteraceae is an Actinomycetota family.
Rubrobacteria is a class of Actinomycetota.
The Thermoleophilia are a class of Actinomycetota.
The Acidimicrobiia are a class of Actinomycetota, in which three families, eight genera, and nine species have been described, Acidimicrobium ferrooxidans is the type species of the order.
The Coprobacillaceae are a family of Bacillota.
Orenia is a genus of bacteria from the family of Halobacteroidaceae. Orenia bacteria occurs in saline environments.
The Sporichthyaceae are the only family of the order Sporichthyales, which is a part of the phylum Actinomycetota.
Planctomycetaceae is a family of bacteria.
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