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This article lists the orders of the Bacteria. The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI) and the phylogeny is based on 16S rRNA-based LTP release 132 by The All-Species Living Tree Project.

Phylogeny

National Center for Biotechnology Information (NCBI) taxonomy was initially used to decorate the genome tree via tax2tree. The 16S rRNA-based Greengenes taxonomy is used to supplement the taxonomy particularly in regions of the tree with no cultured representatives. List of Prokaryotic names with Standing in Nomenclature (LPSN) is used as the primary taxonomic authority for establishing naming priorities. Taxonomic ranks are normalised using phylorank and the taxonomy manually curated to remove polyphyletic groups.

Cladogram was taken from GTDB release 09-RS220 (24 April 2024).

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Kingdom Bacillati

Phylum Chloroflexota

• Class "Bathosphaeria" Mehrshad et al. 2018
  • ?"Bathosphaerales" Mehrshad et al. 2018
• Class "Martimicrobia" Williams et al. 2024
  • ?"Martimicrobiales" Williams et al. 2024
• Class ?"Poriflexia" Kogawa et al. 2022
• Class "Spiritibacteria" Williams et al. 2024
  • ?"Spiritibacterales" Williams et al. 2024
• Class "Tarhunnaeia" Williams et al. 2024
  • ?"Tarhunnaeales" Williams et al. 2024
• Class "Uliximicrobia" Williams et al. 2024
  • ?"Uliximicrobiales" Williams et al. 2024
• Class "Umbricyclopia" Mehrshad et al. 2018
  • ?"Umbricyclopales" Mehrshad et al. 2018 (TK10)
• Class "Dormiibacteria" (sic) Montgomery et al. 2021 (AD3)
  • ?"Aeolococcales" Montgomery et al. 2021
  • "Dormibacterales" (sic) Montgomery et al. 2021
• Class "Limnocylindria" Mehrshad et al. 2018
  • "Limnocylindrales" Mehrshad et al. 2018 (SL56)
• Class Ktedobacteria corrig. Cavaletti et al. 2007
  • Ktedobacterales corrig. Cavaletti et al. 2007 (Thermogemmatisporales)
• Class Dehalococcoidia Löffler et al. 2013
  • "Australimonadales" Prabhu et al. 2024
  • Dehalococcoidales Löffler et al. 2013
  • "Lucifugimonadales" Lim et al. 2023
  • "Monstramariales" Landry et al. 2017
  • Tepidiformales Kochetkova et al. 2020
• Class "Caldilineia" Oren, Parte & Garrity 2016 ex Cavalier-Smith 2020
  • Aggregatilineales Nakahara et al. 2019 ("Phototrophicales")
  • Anaerolineales Yamada et al. 2006
  • Ardenticatenales Kawaichi et al. 2013
  • Caldilineales Yamada et al. 2006
  • "Epilineales" Petriglieri et al. 2023
  • "Roseilineaceae" Ward et al. 2021 {J036}
  • "Promineifilales" corrig. Chuvochina et al. 2023
  • Thermoflexales Dodsworth et al. 2014
• Class Chloroflexia Gupta et al. 2013
  • Chloroflexales Gupta et al. 2013 (Herpetosiphonales, Kallotenuales)
  • "Thermobaculales" Chuvochina et al. 2023
  • Thermomicrobiales Garrity & Holt 2002 (Sphaerobacterales)

Phylum "Sysuimicrobiota"

• Class "Sysuimicrobiia" Liu et al. 2024
  • "Sysuimicrobiales" Liu et al. 2024

Phylum Armatimonadota

• Class "Heboniibacteriia" corrig. Carlton et al. 2023 (CAIYQO01)
  • "Heboniibacterales" corrig. Carlton et al. 2023
• Class "Zipacnadia" Carlton et al. 2023 (UBA5377)
  • "Zipacnadales" Carlton et al. 2023
• Class Abditibacteriia Tahon et al. 2018 (FBP)
  • Abditibacteriales Tahon et al. 2018
• Class HRBIN17
  • "Candidatus Fervidibacter" Rinke et al. 2013 {HRBIN17: HRBIN17} (OctSpa1-106)
• Class UBA5829
  • "Candidatus Hippobium" Gilroy et al. 2022 {UBA5829: UBA5829}
• Class Fimbriimonadia Im et al. 2012
  • Fimbriimonadales Im et al. 2012
• Class Chthonomonadia Oren, Parte & Garrity 2016
  • Chthonomonadales Lee et al. 2011
• Class Armatimonadia Tamaki et al. 2011 (OP10)
  • Armatimonadales Tamaki et al. 2011 (Capsulimonadales)

Phylum Vulcanimicrobiota

• Class "Eudoremicrobiia" Paoli et al. 2022
  • ?"Eudoremicrobiales" Paoli et al. 2022
• Class "Xenobia" Ji et al. 2021 (UBP9)
  • "Xenobiales" Ji et al. 2021
• Class "Eremiobacteriia" corrig. Ward, Cardona & Holland-Moritz 2019 (WPS2)
  • "Eremiobacterales" Ward, Cardona & Holland-Moritz 2019
  • "Vulcanimicrobiales Yabe et al. 2024 ("Baltobacterales"; "Palusbacterales"; "Rubrimentiphilales")

Clade Firmicutes

Firmicutes incertae sedis

• Class Desulfitisporia Sorokin & Merkel 2023
  • Desulfitisporales Sorokin & Merkel 2023
• Class Fermentithermobacillia Kadnikov et al. 2023
  • Fermentithermobacillales Kadnikov et al. 2023
• Class Thermolithobacteria Sokolova et al. 2007
  • Thermolithobacterales Sokolova et al. 2007

Phylum Bacillota G

• Class Limnochordia Watanabe, Kojima & Fukui 2015
  • Limnochordales Watanabe, Kojima & Fukui 2015
• Class "Hydrogenisporia" Pallen, Rodriguez-R & Alikhan 2022
  • "Capillibacteriales" Pallen, Rodriguez-R & Alikhan 2022
  • "Hydrogenisporales" Pallen, Rodriguez-R & Alikhan 2022

Phylum Bacillota E

• Class UBA3575
  • "Candidatus Acetocimmeria" Smith et al. 2021 {UBA3575: UBA3575}
• Class Thermaerobacteria Chuvochina et al. 2024
  • Thermaerobacterales Chuvochina et al. 2024
• Class Symbiobacteriia Chuvochina et al. 2024
  • Symbiobacteriales Chuvochina et al. 2024
• Class Sulfobacillia Chuvochina et al. 2024
  • Sulfobacillales Chuvochina et al. 2024

Phylum "Selenobacteria"

• Class Selenomonadia Oren, Parte & Garrity 2016
  • Acidaminococcales Campbell, Adeolu & Gupta 2015
  • Anaeromusales Chuvochina et al. 2024
  • "Dendrosporobacterales" Pallen, Rodriguez-R & Alikhan 2022
  • "Pelosinaceae" {DSM-13327}
  • Propionisporales Chuvochina et al. 2024
  • Selenomonadales Marchandin et al. 2010
  • "Acetonemaceae" {Sporomusales_A}
  • "Sporomusales"_C
  • "Sporomusales" Cavalier-Smith 2006
  • "Pelorhabdus" {UMGS1260: UMGS1260}
  • Lucifera Sanchez-Andrea et al. 2018 {UPPP01: UPPP01}
  • Veillonellales Campbell, Adeolu & Gupta 2015

Phylum "Desulfotomaculota"

• Class Peptococcia Chuvochina et al. 2024
  • Peptococcales Chuvochina et al. 2024
  • "Thermanaerosceptrales" Pallen, Rodriguez-R & Alikhan 2022
• Class "Dehalobacteriia"
  • "Avidehalobacterales" Pallen, Rodriguez-R & Alikhan 2022
  • "Cryptoclostridiales" Pallen, Rodriguez-R & Alikhan 2022
  • "Dehalobacteriales"
• Class Desulfitobacteriia Chuvochina et al. 2024
  • Desulfitobacteriales Chuvochina et al. 2024
  • "Heliobacteriales" Kinman 1994 ex Cavalier-Smith 2020
• Class "Moorellia"
  • Calderihabitantales Chuvochina et al. 2024
  • Desulfitibacterales Chuvochina et al. 2024
  • Zhaonellaceae Lv et al. 2020 {DULZ01}
  • Moorellales Lv et al. 2020
• Class DSM-12270
  • Thermacetogeniales Chuvochina et al. 2024
• Class Syntrophomonadia Chuvochina et al. 2024
  • Syntrophomonadales Chuvochina et al. 2024
• Class "Carboxydocellia" Pallen, Rodriguez-R & Alikhan 2022
  • "Carboxydocellales Chuvochina et al. 2024
• Class Thermincolia Chuvochina et al. 2024
  • "Thermincolales Chuvochina et al. 2024
• Class "Carboxydothermia" Pallen, Rodriguez-R & Alikhan 2022
  • Carboxydothermales Chuvochina et al. 2024
• Class Desulfotomaculia Chuvochina et al. 2024
  • Ammonificales corrig. Chuvochina et al. 2024
  • Desulfotomaculales Chuvochina et al. 2024

Phylum Bacillota D

• Class "Proteinivoracia"
  • "Proteinivoracales"
• Class "Dethiobacteria" Sorokin & Merkel 2022
  • "Candidatus Contubernalis" corrig. Zhilina et al. 2005 {SKNC01: SKNC01}
  • "Dethiobacterales" Sorokin & Merkel 2022
• Class Natranaerobiia Chuvochina et al. 2024
  • Natranaerobiales Mesbah et al. 2007

Phylum "Halanaerobiaeota"

• Class "Halanaerobiia" Cavalier-Smith 2020
  • "Anoxybacterales" Pallen, Rodriguez-R & Alikhan 2022 {DY22613}
  • Halanaerobiales corrig. Rainey & Zhilina 1995
  • Halobacteroidales Chuvochina et al. 2024

Phylum Bacillota A

• Class Thermosediminibacteria Chuvochina et al. 2024
  • Koleobacterales Sakamoto et al. 2021
  • Thermosediminibacterales Zhang et al. 2019 ("Thermovenabulales")
• Class "Thermoanaerobacteria"
  • Caldicellulosiruptorales Chuvochina et al. 2024
  • Thermoanaerobacterales Wiegel 2010
• Class "Clostridiia" Oren, Parte & Garrity 2016
  • "Thermoclostridiaceae" Pallen, Rodriguez-R & Alikhan 2022 {"Acetivibrionales" A}
  • Acetivibrionales Chuvochina et al. 2024
  • "Avimonoglobales" Pallen, Rodriguez-R & Alikhan 2022
  • Caldicoprobacterales Chuvochina et al. 2024
  • Christensenellales Parks et al. 2018 ex Chuvochina et al. 2024 ("Borkfalkiales"; "Comantemales")
  • Clostridiales Prevot 1953 s.s. ("Plectridiales")
  • ?"Darwinibacteriales" Puchol-Royo et al. 2023
  • "Egerieisomatales" Pallen, Rodriguez-R & Alikhan 2022
  • Eubacteriales Buchanan 1917
  • Lachnospirales Chuvochina et al. 2024
  • Lutisporales Chuvochina et al. 2024
  • Mahellales Chuvochina et al. 2024
  • "Merdicolales" Pallen, Rodriguez-R & Alikhan 2022
  • Monoglobales Chuvochina et al. 2024
  • "Oscillospirales" Glendinning et al. 2020
  • "Petroclostridiales" Pallen, Rodriguez-R & Alikhan 2022
  • Peptostreptococcales Chuvochina et al. 2024
  • "Saccharofermentanales" corrig. Parks et al. 2018
  • Tissierellales Alauzet et al. 2020

Phylum "Bacillota"

• Class "Bacillia" Cavalier-Smith 2020
  • Alicyclobacillales Chuvochina et al. 2024
  • Aneurinibacillales Chuvochina et al. 2024
  • "Bacillidae" Cavalier-Smith 2020 non Enderlein 1917
    • Bacillales_B
    • Bacillales_C
    • Bacillales_D
    • Bacillales_E
    • Bacillales_G
    • Bacillales_H
    • Bacillus marinisedimentorum Guo et al. 2018 {Bacillales_I:Bacillaceae_O}
    • Sporolactobacillaceae Ludwig et al. 2010 {Bacillales_K}
    • Bacillales Prevot 1953 s.s. (Caryophanales, "Caldibacillales")
    • Aureibacillaceae Li et al. 2024 {DSM-28697}
  • Planococcaceae {Bacillales_A}
  • "Bacillus thermozeamaize" Mak 2003 {Bacillales_F: Bacillaceae_M}
  • Brevibacillales Chuvochina et al. 2024
  • "Brockiales" Pallen, Rodriguez-R & Alikhan 2022
  • Caldalkalibacillales Chuvochina et al. 2024
  • Calditerricolales Chuvochina et al. 2024
  • Microaerobacter Khelifi et al. 2011 {DSM-22679: DSM-22679}
  • Desulfuribacillales Sorokin et al. 2021
  • "Erysipelotrichidae" corrig. Cavalier-Smith 2020
    • Acholeplasmatales Freundt et al. 1984 (Anaeroplasmatales)
    • "Aphodocolales" Pallen, Rodriguez-R & Alikhan 2022
    • "Bathyoplasmales" corrig. Zhu, Lian & He 2020
    • Culicoidibacterales Neupane et al. 2020
    • Erysipelotrichales Ludwig et al. 2010
    • Haloplasmatales Rainey et al. 2008 non Zhou et al. 2022
    • "Izemoplasmatales" corrig. Zheng et al. 2021
    • Mycoplasmatales Freundt 1955 ("Borrelomycetales"; "Anulomycetales"; "Paramycetales"; "Mollicutales"; "Pleuropneumoniales"; Entomoplasmatales, Mycoplasmoidales)
    • RFN20
    • Turicibacteraceae Verbarg et al. 2020 {MOL361}
  • Exiguobacteriales Chuvochina et al. 2024
  • "Harrysmithimonadales" Pallen, Rodriguez-R & Alikhan 2022
  • Kyrpidiales Chuvochina et al. 2024
  • Lactobacillales Ludwig, Schleifer & Whitman 2010 ("Plocamobacteriales"; "Coccales")
  • Paenibacillales Chuvochina et al. 2024
  • "Pasteuriales" Pallen, Rodriguez-R & Alikhan 2022
  • "Rubeoparvulales"
  • Staphylococcales Chuvochina et al. 2024
  • Tepidibacillales Chuvochina et al. 2024
  • Thermicanales Chuvochina et al. 2024
  • Thermoactinomycetales Chuvochina et al. 2024
  • Tumebacillales Chuvochina et al. 2024

Phylum Actinomycetota

• Class ?"Syntrophaliphaticia" corrig. Liu et al. 2020
• Class "Geothermincolia" Jiao et al. 2021
  • "Geohydrothermomicrobiales" Pallen, Rodriguez-R & Alikhan 2022
  • "Geothermincolales" Jiao et al. 2021
• Class "Humimicrobiia" Jiao et al. 2021
  • "Hakubellales" corrig. Merino et al. 2020
  • "Humimicrobiales" Jiao et al. 2021
• Class "Aquicultoria" Jiao et al. 2021
  • "Aquicultorales" Jiao et al. 2021
  • "Geothermocultorales" Jiao et al. 2021
  • "Oleimmundimicrobiales" Pallen, Rodriguez-R & Alikhan 2022
  • "Subteraquimicrobiales" Jiao et al. 2021
• Class Coriobacteriia König 2013
  • Anaerosomatales Khomyakova et al. 2023
  • Coriobacteriales Stackebrandt et al. 1997 (Eggerthellales)
• Class Rubrobacteria Suzuki 2013
  • Rubrobacterales Rainey et al. 1997
• Class Thermoleophilia Suzuki & Whitman 2013
  • Gaiellales Albuquerque et al. 2012
  • Miltoncostaeales Li et al. 2021
  • Thermoleophilales Reddy & Garcia-Pichel 2009 (Solirubrobacterales)
• Class Acidimicrobiia Norris 2013
  • Acidimicrobiales Stackebrandt, Rainey & Ward-Rainey 1997
  • "Actinomarinales" Ghai et al. 2013
  • "Spongiisociales" corrig. Nguyen 2022
• Class Nitriliruptoria Ludwig et al. 2013
  • Euzebyales Kurahashi et al. 2010 (Egibacterales)
  • Nitriliruptorales Sorokin et al. 2009 (Egicoccales, Salsipaludibacterales)
• Class Actinomycetia Salam et al. 2020
  • Acidothermales Sen et al. 2014
  • Actinomycetales Buchanan 1917 (Aquipuribacterales; Beutenbergiales; Bifidobacteriales; Bogoriellales; Brevibacteriales; Cellulomonadales; Demequinales; Dermabacterales; Dermatophilales; Microbacteriales; Micrococcales; Kineosporiales; Ruaniales)
  • Jiangellales Tang et al. 2015
  • Motilibacterales Salam et al. 2020
  • Mycobacteriales Janke 1924 (Corynebacteriales; Actinocatenisporales; Actinoplanetales; Actinopolysporales; Antricoccales; Cryptosporangiales; Frankiales; Geodermatophilales; Glycomycetales; Jatrophihabitantales; Micromonosporales; Nakamurellales; Phytomonosporales; Pseudonocardiales)
  • "Nanopelagicales" Neuenschwander et al. 2018
  • Propionibacteriales Patrick & McDowell 2015
  • Sporichthyales Nouioui et al. 2018
  • Streptomycetales Kampfer 2015 (Catenulisporales, Kitasatosporales)
  • Streptosporangiales Goodfellow 2015

Clade Cyanoprokaryota

Phylum "Margulisiibacteriota"

• Class "Saganbacteria" Carnevali et al. 2018 (WOR1)
• Class "Marinamargulisbacteria" Carnevali et al. 2019
• Class "Riflemargulisbacteria" Carnevali et al. 2019 (GWF2_35_9)
• Class "Termititenacia" Utami et al. 2019
  • "Termititenacales" Utami et al. 2019

Phylum "Cyanobacteriota"

• Class "Sericytochromatia" Soo et al. 2017
  • S15B-MN24
  • UBA7694
• Class Vampirovibrionia Chuvochina et al. 2024
  • "Caenarcaniphilales" Soo et al. 2014
  • "Gastranaerophilales" Di Rienzi et al. 2013
  • "Obscuribacterales" Soo et al. 2014
  • Vampirovibrionales Chuvochina et al. 2024
• Class Gloeobacteria Cavalier-Smith 2002
  • Gloeobacterales Cavalier-Smith 2002
• Class Phycobacteria Cavalier-Smith 2002
  • Acaryochloridales Miyashita et al. 2003 ex Strunecký & Mareš 2022 ("Thermosynechococcales")
  • ?Aegeococcales Strunecký & Mareš 2022
  • Trichothermofontia Daroch et al. 2023 {B231}
  • Cyanobacteriales Rippka & Cohen-Bazire 1983 (Chamaesiphonales, Chroococcales, Chroococcidiopsidales, Coleofasciculales, Desertifilales, Nostocales, Oscillatoriales, Pleurocapsales, Spirulinales, Stigonematales)
  • ?"Eurycoccales"
  • ?Geitlerinematales Strunecký & Mareš 2022
  • Gloeoemargaritales Moreira et al. 2016
  • Leptolyngbyales Strunecký & Mareš 2022
  • "Limnotrichales"
  • Neosynechococcales Chuvochina et al. 2024
  • Nodosilineales Strunecký & Mareš 2022 (Phormidesmidales)
  • Oculatellales Strunecký & Mareš 2022 (Elainellales)
  • Prochlorococcaceae Komárek & Strunecky 2020 {"PCC-6307"}
  • Prochlorotrichales Strunecký & Mareš 2022
  • Pseudanabenales Hoffmann, Komárek & Kastovsky 2005
  • Synechococcales Hoffmann, Komárek & Kastovsky 2005
  • Thermostichales Komárek & Strunecký 2020

Kingdom Thermotogati

Phylum Atribacterota

• Class Atribacteria Katayama et al. 2021 (OP9)
  • Atribacterales Katayama et al. 2021 ("Caldatribacteriales")
• Class "Phoenicimicrobiia" Jiao et al. 2024 (JS1)
  • "Phoenicimicrobiales" Jiao et al. 2024 (SB-45)

Phylum Synergistota

• Class Synergistia Jumas-Bilak et al. 2009
  • Synergistales Jumas-Bilak et al. 2009

Phylum "Zhurongbacterota"

Phylum Dictyoglomota

• Class Dictyoglomeria corrig. Patel 2012
  • Dictyoglomerales corrig. Patel 2012

Phylum "Thermodesulfobiota"

• Class "Thermodesulfobiia" Frolov et al. 2022
  • "Thermodesulfobiales" Cavalier-Smith 2020

Phylum Coprothermobacterota

• Class Coprothermobacteria Pavan et al. 2018
  • Coprothermobacterales Pavan et al. 2018

Phylum "Lithacetigenota"

• Class "HKB111"
  • "HKB111"

Phylum "Caldisericota"

• Class Caldisericia Mori et al. 2009 (OP5)
  • Caldisericales Mori et al. 2009
  • "Cryosericales" Martinez et al. 2019

Phylum Thermotogota

• Class "Thermotogia" Oren, Parte & Garrity 2016 ex Cavalier-Smith 2020
  • Mesoaciditogales Itoh et al. 2016
  • Petrotogales Bhandari & Gupta 2014 (Kosmotogales)
  • Thermotogales Reysenbach 2002 emend. Bhandari & Gupta 2014

Clade Candidate Phyla Radiation

Phylum "Elulota"

• Class "Elulimicrobiia" Rodriguez-R et al. 2020
  • ?"Elulimicrobiales" Rodriguez-R et al. 2020

Phylum "Patescibacteria"

• Class "Wirthbacteria"
• Class "Dojkabacteria" (WS6)
• Class "Katanobacteria" (WWE3)
• Class "Microgenomatia"
  • Clade GWA2-44-7
  • "Chazhemtobacteriales" Pallen, Rodriguez-R & Alikhan 2022
  • "Curtissbacterales"
  • "Daviesbacterales"
  • "Gottesmanbacterales"
  • "Levybacterales"
  • "Roizmanbacterales"
  • "Shapirobacterales"
  • "Woykebacterales" (RIF34)
• Class "Absconditabacteria"
  • "Absconditabacterales" (sic)Yakimov et al. 2022 (SR1)
  • "Candidatus Altimarinus" Rinke et al. 2013 {BD1-5: UBA6164} (GN02)
• Class "Gracilibacteria"
  • "Abawacabacterales" (RIF46)
  • "Fertabacterales" (DOLZORAL124_38_8; "Fallacibacteriota")
  • "Peregrinibacterales" (PER)
  • "Peribacterales" Anantharaman et al. 2016
• Class "Berkelbacteria" (ACD58)
• Class "Kazanbacteria" (Kazan)
• Class "Howlettbacteria" (CPR2)
• Class "Saccharimonadia" corrig. Lemos et al. 2019 (TM7)
  • "Saccharimonadales" corrig. Lemos et al. 2019 ex Chuvochina et al. 2023
• Class "Andersenbacteria" (RIF9)
• Class "Doudnabacteria" (SM2F11)
• Class "Torokbacteria" (GCA-2792135)
• Class "ABY1"
  • ?"Brownbacterales"
  • "Buchananbacterales" (RIF37)
  • "Falkowbacterales"
  • "Jacksonbacterales" (RIF38)
  • "Kerfeldbacterales" (RIF4)
  • "Komeilibacterales" (RIF6)
  • "Kuenenbacterales"
  • "Magasanikbacterales"
  • "Moisslbacterales"
  • "Uhrbacterales"
  • "Veblenbacterales" (RIF39)
• Class "Paceibacteria" Chuvochina et al. 2023
  • "Azambacterales"
  • Clade UBA6257
  • "Giovannonibacterales" (UBA11713)
  • ?"Montesolbacterales"
  • "Moranbacterales" (OD1-i)
  • "Niyogibacterales" (RIF11; HO2-45-28)
  • "Paceibacterales" Chuvochina et al. 2023
  • "Parcunitrobacterales" Castelle et al. 2017
  • "Portnoybacterales" (RIF22)
  • "Ryanbacterales" (RIF10)
  • "Spechtbacterales" (RIF19)
  • "Sungbacterales" (RIF17)
  • "Tagabacterales" (RIF12)
  • "Terrybacterales" (RIF13)
  • "Yanofskybacterales" (2-02-FULL-40-12)

Clade

Clade "Fusobacterida"

Phylum "Muiribacteriota"

• Class "Muiribacteriia" corrig. Chuvochina et al. 2023
  • "Muiribacteriales" corrig. Chuvochina et al. 2023

Phylum "Rifleibacteriota"

• Class "Ozemibacteria" corrig. Kadnikov et al. 2018 (RIF32/ACD39)
  • "Ozemibacterales" corrig. Kadnikov et al. 2018

Phylum "Macinerneyibacteriota"

• Class "Macinerneyibacteriia" corrig. Yadav et al. 2020
  • "Macinerneyibacteriales" corrig. Yadav et al. 2020

Phylum Fusobacteriota

• Class Fusobacteriia corrig. Staley & Whitman 2012
  • Fusobacterales Staley & Whitman 2012 ("Bactepneumoniales")

Clade

Phylum "Bipolaricaulota"

• Class "Bipolaricaulia" Chuvochina et al. 2023
  • "Bipolaricaulales" Chuvochina et al. 2023 (KB1 group, OP1)
  • "Fraserbacterales"

Phylum Deinococcota

• "Deinococcia" Cavalier-Smith 2020
  • Deinococcales Rainey et al. 1997 (Thermales; Trueperales) (radio-resistant micrococci)

Kingdom Pseudomonadati

Clade

Phylum "Goldiibacteriota"

• "Candidatus Cellulosimonas" Doud et al. 2020

Phylum Elusimicrobiota

• Class "Elusimicrobiia" Oren, Parte & Garrity 2016 ex Cavalier-Smith 2020 (TG1)
  • Elusimicrobiales Geissinger et al. 2010
  • "Obscuribacteriales" Uzun et al. 2023
• Class "Endomicrobiia" Stingl et al. 2018
  • "Endomicrobiales" Zheng et al. 2018

Phylum "Aerophobota"

• Class "Aerophobia" Chuvochina et al. 2023 (CD12)
  • "Aerophobales" Chuvochina et al. 2023

Phylum "Auribacterota"

• Class "Ancaeobacteria" Williams et al. 2022
  • "Ancaeobacterales" Williams et al. 2022
• Class "Auribacteria" Williams et al. 2022
  • "Auribacterales" Williams et al. 2022
• Class "Erginobacteria" Williams et al. 2022
  • "Erginobacterales" Williams et al. 2022
• Class JACPWU01
  • "Theseobacterales" Williams et al. 2022
• Class "Tritonobacteria" Williams et al. 2022
  • "Tritonobacterales" Williams et al. 2022

Phylum "Omnitrophota"

• Class "Omnitrophia" (OP3)
  • "Omnitrophales"
• Class "Velamenicoccia" Pallen, Rodriguez-R & Alikhan 2022
  • "Aquitaenarimonadales" Seymour et al. 2022
  • "Aquiviventales" Seymour et al. 2022
  • "Duberdicusellales" Seymour et al. 2022
  • "Ghiorseimicrobiales" Seymour et al. 2022
  • "Gorgyraeales" Seymour et al. 2023
  • "Gygaeellales" Seymour et al. 2023
  • "Candidatus Orphnella" Williams et al. 2021 {JABMRG01: JABMRG01}
  • "Kaelpiales" Seymour et al. 2022
  • "Kappaeales" Seymour et al. 2022
  • "Pluralincolimonadales" Seymour et al. 2022
  • "Taenaricolales" Seymour et al. 2022
  • "Tantalellales" Seymour et al. 2022
  • "Velamenicoccales" Pallen, Rodriguez-R & Alikhan 2022
  • "Velesiimonadales" Seymour et al. 2022
  • "Zapsychrales" Seymour et al. 2022

Clade Spirochaetobacteriobiontes

Phylum "Babelota"

• Class "Babeliae" (sic) Yeoh et al. 2016 (TM6)
  • "Babelales" corrig. Yeoh et al. 2016

Phylum Spirochaetota

• Class Leptospiria Chuvochina et al. 2024
  • Leptospirales corrig. Gupta et al. 2014
  • Turneriellales Chuvochina et al. 2024
• Class Brevinematia Chuvochina et al. 2024
  • Brevinematales Gupta et al. 2014
• Class Brachyspiria Chuvochina et al. 2024
  • Brachyspirales corrig. Gupta et al. 2014
• Class "Exilispiria" Pallen, Rodriguez-R & Alikhan 2022
  • "Exilispirales" Pallen, Rodriguez-R & Alikhan 2022
• Class Spirochaetia Paster 2020
  • ?Spirochaetales Buchanan 1917
  • Borreliales Chuvochina et al. 2024
  • Spirochaeta cellobiosiphila Breznak & Warnecke 2008 {DSM-17781: DSM-17781}
  • "Entomospirales" Pallen, Rodriguez-R & Alikhan 2022
  • "Marispirochaetales" Pallen, Rodriguez-R & Alikhan 2022
  • "Salinispirales" Pallen, Rodriguez-R & Alikhan 2022
  • "Sediminispirochaetales" Pallen, Rodriguez-R & Alikhan 2022
  • Sphaerochaetales Chuvochina et al. 2024
  • Spirochaeta thermophila Aksenova et al. 1992 {Spirochaetales_A}
  • Spirochaetales_E
  • Treponematales Chuvochina et al. 2024

Clade Planctobacteria

Phylum Planctomycetota

• Class "Uabimicrobiia" Lodha, Narvekar & Karodi 2021
  • "Uabimicrobiales" Lodha, Narvekar & Karodi 2021
• Class "Brocadiia" JLodha, Narvekar & Karodi 2021
  • "Brocadiales" Jetten et al. 2010
  • "Hypogeohydatales" Wu et al. 2023
  • "Wukongales" Wu et al. 2023
• Class Phycisphaeria Oren, Parte & Garrity 2016
  • Phycisphaerales Fukunaga et al. 2010
  • Sedimentisphaerales Spring et al. 2018
  • Tepidisphaerales Kovaleva et al. 2015
• Class Planctomycetia Ward 2020
  • Gemmatales Dedysh et al. 2020
  • Isosphaerales Dedysh et al. 2020
  • Pirellulales Dedysh et al. 2020
  • Planctomycetales Schlesner & Stackebrandt 1987 em. Ward 2011

Phylum Chlamydiota

• Class Chlamydiia Horn 2011
  • "Similichlamydiales" Pallen, Rodriguez-R & Alikhan 2022
  • Chlamydiales Storz & Page 1971 em. Everett et al. 1999 (Parachlamydiales, "Anoxychlamydiales", "Simkaniales")

Phylum Verrucomicrobiota

• Class Lentisphaeria Cho et al. 2004
  • Lentisphaerales Cho et al. 2004
  • Oligosphaerales Qiu et al. 2013
  • Victivallales Cho et al. 2004
• Class Kiritimatiellae Spring et al. 2017
  • Kiritimatiellales Spring et al. 2017
  • "Spyradenecales" Pallen, Rodriguez-R & Alikhan 2022
• Class Verrucomicrobiia corrig. Hedlund, Gosink & Staley 1998
  • Limisphaerales Podosokorskaya et al. 2023
  • "Methylacidiphilales" Op den Camp 2009
  • Opitutales Choo et al. 2007 (Puniceicoccales)
  • Terrimicrobiales García-López et al. 2020 ("Chthoniobacterales")
  • Verrucomicrobiales Ward-Rainey et al. 1996 em. Yoon et al. 2008

Clade

Phylum "Saltatorellota"

• Class "Saltatorellae" Wiegand et al. 2019
  • ?"Saltatorellales" Wiegand et al. 2019

Phylum "Hinthialibacterota"

• Class "Hinthialibacteria" Williams et al. 2022
  • "Hinthialibacterales" Williams et al. 2022

Phylum "Sumerlaeota"

• Class "Sumerlaeia" Kadnikov et al. 2018
  • "Sumerlaeales" Kadnikov et al. 2018

Phylum "Poribacteriota"

• Class ?"Entoporibacteria" Podell et al. 2019
• Class ?"Pelagiporibacteria" Podell et al. 2019

Phylum "Hydrogenedentota"

• Class "Hydrogenedentia" Chuvochina et al. 2023 (NKB19)
  • "Hydrogenedentales" corrig. Chuvochina et al. 2023

Clade FCB group

Phylum "Heilongiota"

• Class "Heilongiia" corrig. Zhang et al. 2022
  • ?"Heilongiales" Zhang et al. 2022

Phylum "Fidelibacterota"

• ?"Candidatus Neomarinimicrobium" Rinke et al. 2013 corrig. Oren et al. 2020 (Candidate phylum SAR406; candidate phylum Marine Group A)
• Class Fidelibacteria Katayama et al. 2024
  • ?Fidelibacterales Katayama et al. 2024

Phylum "Tianyaibacteriota"

• ?"Candidatus Tianyaibacterium" corrig. Cui et al. 2021

Phylum "Fermentibacterota"

• Class "Fermentibacteria" Kirkegaard 2016 ("Aegiribacteria")
  • "Fermentibacterales" Kirkegaard 2016 (Hyd24-12)

Phylum "Latescibacterota"

• Class "Handelsmanbacteria" (RIF27)
• Class "Latescibacteria" Chuvochina et al. 2023
  • "Latescibacterales" Chuvochina et al. 2023 (WS3)

Phylum "Krumholzibacteriota"

• Class "Krumholzibacteriia" corrig. Youssef et al. 2019
  • "Delphibacterales" (DOLZORAL124_64_63; LZORAL124-64-63)
  • "Krumholzibacteriales" Youssef et al. 2019 (UBP1)

Phylum Gemmatimonadota

• Class "Glassbacteria" (RIF5)
• Class Gemmatimonadetes Zhang et al. 2003
  • Gemmatimonadales Zhang et al. 2003
  • Longimicrobiales Pascual et al. 2016
  • "Palaucibacterales" Aldeguer-Riquelme, Antón & Santos 2022

Phylum "Hydrothermota"

• Class "Stahliibacteriia" (UBA3073)
• Class "Hydrothermia" Chuvochina et al. 2019 ex Chuvochina et al. 2023
  • "Hydrothermales" Chuvochina et al. 2019 ex Chuvochina et al. 2023 (EM3)
  • "Caldipriscales" Pallen, Rodriguez-R & Alikhan 2022

Phylum "Cloacimonadota"

• Class "Cloacimonadia" Williams et al. 2021 ex Chuvochina et al. 2023
  • "Candidatus Celaenobacter" Williams et al. 2021 {JGIOTU-2: JGIOTU-2}
  • "Cloacimonadales" Williams et al. 2021 ex Chuvochina et al. 2023 (WWE1)

Phylum Fibrobacterota

• Class "Raymondbacteria" (RIF7; OXYB2-FULL-49-7)
• Class Chitinivibrionia Sorokin et al. 2014
  • Chitinivibrionales Sorokin et al. 2014
• Class Fibrobacteria Spain et al. 2012
  • Fibrobacterales Spain et al. 2012

Phylum "Electryoneota"

• Class "Electryoneia" Williams et al. 2022
  • Electryoneales Williams et al. 2022
• Class AABM5-125-24
  • Hatepunaeales Williams et al. 2022
• Class "Tariuqbacteria" Vigneron, Vincent & Lovejoy 2023
  • ?Tariuqbacterales Vigneron, Vincent & Lovejoy 2023

Phylum "Marinisomatota"

• Class "Marinisomatia"
  • "Marinisomatales" (SAR406)

Phylum "Cosmopoliota"

• Class "Cosmopolitia" (sic) Zhang et al. 2023
  • "Cosmopoliales" Zhang et al. 2023 (SAR406)

Phylum Calditrichota

• Class Calditrichia Kublanov et al. 2022
  • Calditrichales Kublanov et al. 2020

Phylum Bacteroidota

• Class "Kapaibacteriia" corrig. Chuvochina et al. 2023 (OPB56)
  • "Kapaibacteriales" corrig. Chuvochina et al. 2023
• Class "Kryptonia"
  • "Kryptoniales"
• Class "Ignavibacteriia" Oren, Parte & Garrity 2016 ex Cavalier-Smith 2022
  • Ignavibacteriales Iino et al. 2010
• Class Chlorobiia Oren, Parte & Garrity 2016 ex Cavalier-Smith 2020
  • Chlorobiales Gibbons & Murray 1978
• Class Rhodothermia Munoz, Rossello-Mora & Amann 2017
  • Balneolales Munoz, Rossello-Mora & Amann 2017
  • Rhodothermales Munoz, Rossello-Mora & Amann 2017
• Class Bacteroidia Krieg 2012
  • Bacteroidales Krieg 2012
  • Chitinophagales Munoz, Rossello-Mora & Amann 2017
  • Cytophagales Leadbetter 1974
  • "Amoebophilaceae" Santos-Garcia et al. 2014 {Cytophagales_A}
  • Flavobacteriales Bernardet 2012
  • Blattabacteriaceae Kambhampati 2012 {Flavobacteriales_B}
  • Sphingobacteriales Kämpfer 2012

Clade Proteobacteria

Phylum "Canglongiota"

• Class "Canglongiliia" Zhang et al. 2022
  • ?"Canglongiales" Zhang et al. 2022

Phylum Acidobacteriota

• Class "Fischerbacteria" (RIF25; HRBIN11)
• Class "Guanabaribacteriia" corrig. Tschoeke et al. 2020
  • "Guanabaribacteriales" corrig. Tschoeke et al. 2020
• Class "Aminicenantia" Chuvochina et al. 2023
  • "Aminicenantales" Kadnikov et al. 2019 ex Chuvochina et al. 2023 (OP8)
• Class Thermoanaerobaculia Dedysh & Yilmaz 2018
  • "Multivorales" Nguyen 2022
  • Thermoanaerobaculales Dedysh & Yilmaz 2018
• Class "Holophagia" Oren, Parte & Garrity 2016
  • Acanthopleuribacterales Fukunaga et al. 2008
  • Holophagales Fukunaga et al. 2008
  • Thermotomaculales Dedysh & Yilmaz 2018
• Class "Polarisedimenticolia" Flieder et al. 2021
  • "Polarisedimenticolales" Flieder et al. 2021
• Class Vicinamibacteria Dedysh & Yilmaz 2018
  • "Marinacidobacterales" Nguyen 2022
  • Vicinamibacterales Dedysh & Yilmaz 2018
• Class Blastocatellia Pascual et al. 2016
  • ?"Frugalibacteriales" Ruhl et al. 2022
  • Blastocatellales Pascual et al. 2016
  • "Chloracidobacteriales"
• Class Acidobacteriia Thrash & Coates 2010
  • Acidobacteriales Cavalier-Smith 2002
  • "Acidoferrales" Epihov et al. 2021
  • Bryobacterales Dedysh & Yilmaz 2018
  • "Versatilivorales" Nguyen 2022

Phylum SAR324

• Class Lambdaproteobacteria Anantharaman et al. 2016 (RIF24)

Phylum Bdellovibrionota

• Class Oligoflexia Nakai et al. 2014
  • Oligoflexales Nakai et al. 2014
  • Silvanigrellales Hahn et al. 2017
• Class Bdellovibrionia Waite et al. 2020
  • Bdellovibrionales Garrity, Bell & Lilburn 2006
• Class Bacteriovoracia Waite et al. 2020
  • Bacteriovoracales Hahn et al. 2017

Phylum "Lernaellota"

• Class "Lernaellia" Williams et al. 2022
  • "Alcyoniellaceae" Williams et al. 2022 {JAVCCG01}
  • "Lernaellales" Williams et al. 2022

Phylum "Binatota"

• Class "Binatia" Chuvochina et al. 2019 ex Chuvochina et al. 2023
  • "Binatales" Chuvochina et al. 2019 ex Chuvochina et al. 2023

Phylum Myxococcota

• Class "Kuafubacteriia" corrig. Li et al. 2023
  • "Kuafubacteriales" Li et al. 2023
• Class Myxococcia Waite et al. 2020
  • Myxococcales Tchan, Pochon & Prévot 1948 (fruiting gliding bacteria)
• Class Bradymonadia corrig. Chuvochina et al. 2024
  • Bradymonadales Wang et al. 2015
• Class Polyangiia corrig. Waite et al. 2020
  • Haliangiales Waite et al. 2020
  • Nannocystales (Reichenbach 2007) Waite et al. 2020
  • Polyangiales Tchan, Pochon & Prevot 1948

Phylum "Deferrisomatota"

• Class Deferrisomatia Waite et al. 2020
  • Deferrisomatales Waite et al. 2020

Phylum "Moduliflexota"

• Class "Moduliflexia" Sekiguchi et al. 2015 (KSB3)
  • "Moduliflexales" Sekiguchi et al. 2015

Phylum "Methylomirabilaeota"

• Class "Methylomirabilia" Chuvochina et al. 2023
  • "Methylomirabilales" Cabrol et al. 2020 ex Chuvochina et al. 2023
  • "Rokubacteriales" (CSP1-6)