Name: Actinomycetota Goodfellow 2021

Category: Phylum

Proposed as: phyl. nov.

Etymology: Ac.ti.no.my.ce.to’ta. N.L. masc. n. Actinomyces, type genus of the phylum; L. neut. pl. n. suff. -ota, ending to denote a phylum; N.L. neut. pl. n. Actinomycetota, the Actinomyces phylum

Pronunciation (Latin), gender: ak-ti-no-my-ke-TO-ta, neuter

Type genus: Actinomyces Harz 1877 (Approved Lists 1980)

Valid publication: Oren A, Garrity GM. Valid publication of the names of forty-two phyla of prokaryotes. Int J Syst Evol Microbiol 2021; 71:5056. 🇮🇱

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 71, part 10 of the IJSEM. Int J Syst Evol Microbiol 2022; 72:5165.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Synonyms:

  • Name	Kind
    "Actinobacteria" (ex Margulis 1974) Cavalier-Smith 2020	homotypic synonym, not validly published
    "Actinobacteriota" Whitman et al. 2018	homotypic synonym, not validly published
    "Actinobacteria" Goodfellow 2012	homotypic synonym, not validly published
    "Actinobacteraeota" Oren et al. 2015	homotypic synonym, not validly published

• Notes:
  • 🧕 Göker and Oren (2024) assigned this phylum to the domain Bacteria Woese et al. 2024. Publication: Goker M, Oren A. Valid publication of names of two domains and seven kingdoms of prokaryotes. Int J Syst Evol Microbiol 2024; 74:6242. 🇩🇪
  • 🧕 Oren and Garrity (2021) assigned this phylum to the domain "Bacteria" Woese et al. 1990. Publication: Oren A, Garrity GM. Valid publication of the names of forty-two phyla of prokaryotes. Int J Syst Evol Microbiol 2021; 71:5056. 🇮🇱
  • 🧒 Kästle-Silva et al. (2025) assigned the family Bifidobacteriaceae Stackebrandt et al. 1997 to this phylum. Publication: Silva JK, Herve V, Mies US, Platt K, Brune A. A Novel Lineage of Endosymbiotic Actinomycetales: Genome Reduction and Acquisition of New Functions in Bifidobacteriaceae Associated With Termite Gut Flagellates. Environ Microbiol 2025; 27:e70010. 🇩🇪
  • 🧒 Oren and Garrity (2021) assigned the class Actinobacteria Stackebrandt et al. 1997 to this phylum. Publication: Oren A, Garrity GM. Valid publication of the names of forty-two phyla of prokaryotes. Int J Syst Evol Microbiol 2021; 71:5056. 🇮🇱
  • 🧒 Oren and Garrity (2021) assigned the genus Actinomyces Harz 1877 (Approved Lists 1980) to this phylum. Publication: Oren A, Garrity GM. Valid publication of the names of forty-two phyla of prokaryotes. Int J Syst Evol Microbiol 2021; 71:5056. 🇮🇱
  • 🧒 Oren and Garrity (2021) assigned the order "Candidatus Hakubanellales" Merino et al. 2020 to this phylum. Publication: Oren A, Garrity GM. Valid publication of the names of forty-two phyla of prokaryotes. Int J Syst Evol Microbiol 2021; 71:5056. 🇮🇱
  • 🧒 Swiecimska et al. (2023) assigned the family Streptomycetaceae Waksman and Henrici 1943 (Approved Lists 1980) to this phylum. Publication: Swiecimska M, Golinska P, Sangal V, Wachnowicz B, Goodfellow M. Streptantibioticus silvisoli sp. nov., acidotolerant actinomycetes from pine litter, reclassification of Streptomyces cocklensis, Streptomyces ferralitis, Streptomyces parmotrematis and Streptomyces rubrisoli as Actinacidiphila cocklensis comb. nov., Streptantibioticus ferralitis comb. nov., Streptantibioticus parmotrematis comb. nov. and Streptantibioticus rubrisoli comb. nov., and emended descriptions of the genus Streptantibioticus, the family Streptomycetaceae and Streptomyces iconiensis. Int J Syst Evol Microbiol 2023; 73:5978. 🇵🇱
  • 🚃 The type genus of this phylum has alternatively been placed in the phylum "Actinobacteria" Goodfellow 2012. Publication: Cavalier-Smith T, Chao EE. Multidomain ribosomal protein trees and the planctobacterial origin of neomura (eukaryotes, archaebacteria). Protoplasma 2020; 257:621-753. 🇬🇧
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Actinobiota".
  • ✏ The authority of the taxon name (Goodfellow) deliberately differs from the authors of the publication (Oren and Garrity).
  • 🎰 The BRCs most frequently used for deposits in this group are: DSM: 5226; JCM: 4337; NBRC: 2856; ATCC: 2364; NRRL: 2224; IFO: 1793; KCTC: 1561; CGMCC: 1216; VKM: 1195; CIP: 1080.

Subdivision:

Number of child taxa with a validly published and correct name: 6
Number of child taxa with a validly published name, including synonyms: 10
Total number of child taxa: 14

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Acidimicrobiia Norris 2013	validly published under the ICNP	correct name
    Actinobacteria Stackebrandt et al. 1997	validly published under the ICNP, illegitimate name	synonym
    Actinomycetes Krassilnikov 1949 (Approved Lists 1980)	validly published under the ICNP	correct name
    Actinomycetia Salam et al. 2020	validly published under the ICNP, illegitimate name	synonym
    [Actinomycetota, not assigned to class]	artificial parent node of taxa incertae sedis
    "Candidatus Aquicultoria" Jiao et al. 2021	not validly published	preferred name
    Arabobacteria Cavalier-Smith 2002	validly published under the ICNP, rejected name	synonym
    Arthrobacteria Cavalier-Smith 2002	validly published under the ICNP, rejected name	synonym
    Coriobacteriia König 2013	validly published under the ICNP	correct name
    "Candidatus Geothermincolia" Jiao et al. 2021	not validly published	preferred name
    "Candidatus Humimicrobiia" Jiao et al. 2021	not validly published	preferred name
    Nitriliruptoria Ludwig et al. 2013	validly published under the ICNP	correct name
    Rubrobacteria Suzuki 2013	validly published under the ICNP	correct name
    Thermoleophilia Suzuki and Whitman 2013	validly published under the ICNP	correct name

Parent taxon: Bacillati (Gibbons and Murray 1978) Oren and Göker 2024

Assigned by: Goker M, Oren A. Valid publication of names of two domains and seven kingdoms of prokaryotes. Int J Syst Evol Microbiol 2024; 74:6242. 🇩🇪

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Record number: 51272