The Actinomycetaceae (often called actinomycetes or mycelial bacteria) are a family of bacteria in the order

Actinomycetales The Actinomycetales is an order of Actinomycetota. A member of the order is often called an actinomycete. Actinomycetales are generally gram-positive and anaerobic and have mycelia in a filamentous and branching growth pattern. Some actinomycete ...

that contains the medically important genus ''

Actinomyces ''Actinomyces'' is a genus of the Actinomycetia class of bacteria. They all are gram-positive. ''Actinomyces'' species are facultatively anaerobic and they grow best under anaerobic conditions. ''Actinomyces'' species may form endospores, and ...

''. These organisms are closely related to the mycobacteria, but were originally classified as fungi because they were thought to be transitional forms between

bacteria Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among ...

and

fungi A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from ...

Genera

The family ''Actinomycetaceae'' comprises the following genera: * '' Actinobaculum'' Lawson et al. 1997 * "'' Actinomonospora''" Castellani et al. 1959 * ''

'' Harz 1877 (Approved Lists 1980) * '' Actinotignum'' Yassin et al. 2015 * "'' Ancrocorticia''" Xu et al. 2019 * ''

Arcanobacterium ''Arcanobacterium'' () is a genus of bacteria. They are gram-positive, non– acid fast, nonmotile, facultatively anaerobic, and non–endospore forming. They are widely distributed in nature in the microbiota of animals (including the human mic ...

'' Collins et al. 1983 * '' Boudabousia'' Nouioui et al. 2018 * '' Bowdeniella'' corrig. Nouioui et al. 2018 * '' Buchananella'' Nouioui et al. 2018 * '' Flaviflexus'' Du et al. 2013 * '' Fudania'' Zhu et al. 2019 * '' Gleimia'' Nouioui et al. 2018 * ''

Mobiluncus ''Mobiluncus'' is a genus of Gram-positive, anaerobic, rod-shaped bacteria. These bacteria may be stained either Gram-negative or Gram-variable. However, they are classified as Gram-positive rods due to the fact that they possess a Gram-positive ...

'' Spiegel and Roberts 1984 * "'' Neoactinobaculum''" Belkacemi et al. 2019 * '' Pauljensenia'' Nouioui et al. 2018 * '' Peptidiphaga'' Beall et al. 2021 * '' Schaalia'' Nouioui et al. 2018 * "'' Scrofimicrobium''" Wylensek et al. 2020 * '' Trueperella'' Yassin et al. 2011 * '' Varibaculum'' Hall et al. 2003 * '' Winkia'' Nouioui et al. 2018

Phylogeny

The currently accepted taxonomy is based on the

List of Prokaryotic names with Standing in Nomenclature List of Prokaryotic names with Standing in Nomenclature (LPSN) is an online database that maintains information on the naming and taxonomy of prokaryotes, following the taxonomy requirements and rulings of the International Code of Nomenclature ...

(LPSN). The phylogeny is based on whole-genome analysis.

Notes

References

External links

*https://web.archive.org/web/20070929122155/http://sn2000.taxonomy.nl/Main/Classification/111575.htm * Actinomycetales Bacteria families {{actinobacteria-stub