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)^[1] and National Center for Biotechnology Information (NCBI)^[2] and the phylogeny is based on 16S rRNA-based LTP release 132 by The All-Species Living Tree Project.^[3]

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.^{[4][5][6][7][8]}

Cladogram was taken from GTDB release 08-RS214 (28 April 2023).^[9][10][11]

Clade Terrabacteria

Phylum Chloroflexota

• Class "Bathosphaeria" Mehrshad et al. 2018
  • ?"Bathosphaerales" Mehrshad et al. 2018 [DTDB tag: JG30-KF-CM66]
• Class ?"Poriflexia" Kogawa et al. 2022
• Class "Umbricyclopia" Mehrshad et al. 2018
  • ?"Umbricyclopales" Mehrshad et al. 2018 (TK10)
• 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
  • Dehalococcoidales Löffler et al. 2013
  • 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
  • "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)
• Class "Spiritibacteria" Williams et al. 2024
  • "Spiritibacterales" Williams et al. 2024
• Class "Martimicrobia" Williams et al. 2024
  • "Martimicrobiales" 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

Phylum Dormiibacterota

• Class "Dormiibacteria" (sic) Montgomery et al. 2021 (AD3)
  • ?"Aeolococcales" Montgomery et al. 2021
  • "Dormibacterales" (sic) Montgomery et al. 2021

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 Li, Kudo & Tonouchi 2018

Phylum Eremiobacterota

• 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)
  • "Baltobacterales" Ward, Cardona & Holland-Moritz 2019 ("Palusbacterales"; "Rubrimentiphilales"; "Vulcanimicrobiales")
  • "Eremiobacterales" Ward, Cardona & Holland-Moritz 2019

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 E

• Class "Thermaerobacteria" Chuvochina et al. 2023
  • "Thermaerobacterales" Chuvochina et al. 2023
• Class UBA3575
  • "Candidatus Acetocimmeria" Smith et al. 2021 {UBA3575: UBA3575}
• Class "Symbiobacteriia" Wang et al. 2021 ex Chuvochina et al. 2023
  • "Symbiobacteriales" Chuvochina et al. 2023
• Class "Sulfobacillia" Chuvochina et al. 2023
  • "Sulfobacillales" Cavalier-Smith 2020 ex Chuvochina et al. 2023

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 [UBA10575]
  • "Hydrogenisporales" Pallen, Rodriguez-R & Alikhan 2022 [UBA8346]

Phylum "Halanaerobiaeota"

• Class "Halanaerobiia" Cavalier-Smith 2020
  • "Anoxybacterales" Pallen, Rodriguez-R & Alikhan 2022 {DY22613}
  • Halanaerobiales corrig. Rainey & Zhilina 1995
  • "Halobacteroidales" Chuvochina et al. 2023

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" Sorokin et al. 2021 ex Chuvochina et al. 2023
  • Natranaerobiales Mesbah et al. 2007

Phylum "Selenobacteria"

• Class Selenomonadia Oren, Parte & Garrity 2016
  • Acidaminococcales Campbell, Adeolu & Gupta 2015
  • "Anaeromusales" Chuvochina et al. 2023
  • "Dendrosporobacterales" Pallen, Rodriguez-R & Alikhan 2022
  • "Propionisporales" Chuvochina et al. 2023
  • Selenomonadales Marchandin et al. 2010
  • "Acetonemaceae" {Sporomusales_A}
  • "Sporomusales"_C
  • "Sporomusales" Cavalier-Smith 2006
  • "Pelorhabdus" {UMGS1260: UMGS1260}
  • Veillonellales Campbell, Adeolu & Gupta 2015

Phylum "Desulfotomaculota"

• Class "Syntrophomonadia" Chuvochina et al. 2023
  • "Syntrophomonadales" Chuvochina et al. 2023
• Class "Peptococcia" Chuvochina et al. 2023
  • "Peptococcales" Chuvochina et al. 2023
  • "Thermanaerosceptrales" Pallen, Rodriguez-R & Alikhan 2022 [DRI-13]
• Class "Dehalobacteriia"
  • "Avidehalobacterales" Pallen, Rodriguez-R & Alikhan 2022 [UBA4068]
  • "Cryptoclostridiales" Pallen, Rodriguez-R & Alikhan 2022 [UBA7702]
  • "Dehalobacteriales"
• Class "Desulfitobacteriia" Chuvochina et al. 2023
  • "Desulfitobacteriales" Chuvochina et al. 2023
  • "Heliobacteriales" Cavalier-Smith 2020
• Class DSM-12270
  • "Thermacetogeniales" Chuvochina et al. 2023
• Class "Moorellia"
  • "Calderihabitantales" Chuvochina et al. 2023
  • "Desulfitibacterales" Chuvochina et al. 2023
  • Zhaonellaceae Lv et al. 2020 {DULZ01}
  • Moorellales Lv et al. 2020
• Class "Carboxydocellia" Pallen, Rodriguez-R & Alikhan 2022
  • "Carboxydocellales" Chuvochina et al. 2023
• Class "Thermincolia" Chuvochina et al. 2023
  • "Thermincolales" Chuvochina et al. 2023
• Class "Carboxydothermia" Pallen, Rodriguez-R & Alikhan 2022
  • "Carboxydothermales" Chuvochina et al. 2023
• Class "Desulfotomaculia" Watanabe, Fukui & Kuever 2019 ex Chuvochina et al. 2023
  • "Ammonificales" corrig. Chuvochina et al. 2023
  • "Desulfotomaculales" Watanabe, Fukui & Kuever 2019 ex Chuvochina et al. 2023

Phylum Bacillota A

• Class "Thermosediminibacteria" Chuvochina et al. 2023
  • "Koleobacterales" Sakamoto et al. 2021
  • Thermosediminibacterales Zhang et al. 2019 ("Thermovenabulales")
• Class "Thermoanaerobacteria"
  • "Caldicellulosiruptorales" Bing et al. 2023 ex Chuvochina et al. 2023
  • Thermoanaerobacterales Wiegel 2010 ["Caldanaerobiales"]
• Class Clostridiia Rainey 2010 Oren, Parte & Garrity 2016
  • "Thermoclostridiaceae" Pallen, Rodriguez-R & Alikhan 2022 {"Acetivibrionales" A}
  • "Acetivibrionales" Chuvochina et al. 2023
  • "Avimonoglobales" Pallen, Rodriguez-R & Alikhan 2022 [UBA1381]
  • "Caldicoprobacterales" Chuvochina et al. 2023
  • "Christensenellales" Parks et al. 2018 ex Chuvochina et al. 2023 ("Borkfalkiales"; "Comantemales"

)

• • Clostridiales Prevot 1953 s.s. ("Plectridiales")
  • "Egerieisomatales" Pallen, Rodriguez-R & Alikhan 2022 [UBA1212]
  • Eubacteriales Buchanan 1917
  • "Lachnospirales" Parks et al. 2018 ex Chuvochina et al. 2023
  • "Lutisporales" Chuvochina et al. 2023
  • "Mahellales" Chuvochina et al. 2023
  • "Merdicolales" Pallen, Rodriguez-R & Alikhan 2022 [TANB77]
  • "Monoglobales" Chuvochina et al. 2023
  • "Oscillospirales" Glendinning et al. 2020
  • "Petroclostridiales" Pallen, Rodriguez-R & Alikhan 2022 [SK-Y3]
  • "Peptostreptococcales" Chuvochina et al. 2023
  • "Saccharofermentanales" corrig. Parks et al. 2018
  • Tissierellales Alauzet et al. 2020

Phylum "Bacillota"

• Class "Bacillia" Cavalier-Smith 2020
  • "Alicyclobacillales" Chuvochina et al. 2023
  • "Aneurinibacillales" Chuvochina et al. 2023
  • "Bacillidae" Cavalier-Smith 2020 non Enderlein 1917
    • Bacillales D
    • Bacillales E
    • Bacillales G
    • Bacillales H
    • Bacillales I
    • Bacillales Prevot 1953 s.s. (Caryophanales, "Caldibacillales")
  • "Bacillus thermozeamaize" Mak 2003 {Bacillales F: Bacillaceae_M}
  • Sporolactobacillaceae Ludwig et al. 2010 {Bacillales_K}
  • "Brevibacillales" Chuvochina et al. 2023
  • "Brockiales" Pallen, Rodriguez-R & Alikhan 2022
  • "Caldalkalibacillales" Chuvochina et al. 2023
  • "Calditerricolales" Chuvochina et al. 2023
  • 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 [MAG-NZ]
    • 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
  • "Exiguobacteriales" corrig. Glendinning et al. 2020 ex Chuvochina et al. 2023
  • "Harrysmithimonadales" Pallen, Rodriguez-R & Alikhan 2022 [CAJFEE01]
  • "Kyrpidiales" Chuvochina et al. 2023
  • Lactobacillales Ludwig, Schleifer & Whitman 2010 ("Plocamobacteriales"; "Coccales")
  • "Paenibacillales" Chuvochina et al. 2023
  • "Pasteuriales" Pallen, Rodriguez-R & Alikhan 2022 [RES148]
  • "Rubeoparvulales"
  • "Staphylococcales" Chuvochina et al. 2023
  • "Tepidibacillales" Chuvochina et al. 2023
  • "Thermicanales" Du et al. 2022 ex Chuvochina et al. 2023
  • "Thermoactinomycetales" Chuvochina et al. 2023
  • "Tumebacillales" Chuvochina et al. 2023

Phylum Actinomycetota

• Class ?"Syntrophaliphaticia" corrig. Liu et al. 2020
• 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 [UBA3085]
  • "Subteraquimicrobiales" Jiao et al. 2021
• Class Coriobacteriia König 2013
  • ?"Anaerosomatales" Khomyakova et al. 2022
  • Coriobacteriales Stackebrandt et al. 1997 (Eggerthellales)
• Class "Geothermincolia" Jiao et al. 2021
  • "Geohydrothermomicrobiales" Pallen, Rodriguez-R & Alikhan 2022 [Fen-727]
  • "Geothermincolales" Jiao et al. 2021
• 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
  • ?"Spongiisociales" corrig. Nguyen 2022
  • Acidimicrobiales Stackebrandt, Rainey & Ward-Rainey 1997
  • "Actinomarinales" Ghai et al. 2013
• 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)
  • Euzebyales Kurahashi et al. 2010 (Egibacterales)
  • 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
  • Nitriliruptorales Sorokin et al. 2009 (Egicoccales, Salsipaludibacterales)
  • 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 "Melainabacteria" Soo et al. 2014
  • "Caenarcaniphilales" Soo et al. 2014
  • "Gastranaerophilales" Di Rienzi et al. 2013
  • "Obscuribacterales" Soo et al. 2014
  • "Vampirovibrionales" Soo et al. 2015 ex Chuvochina et al. 2023
• Class "Sericytochromatia" Soo et al. 2017
  • S15B-MN24 ["Sericytochromatia"; "Tanganyikabacteria"]
  • UBA7694 ["Blackallbacteria"]
• 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
  • Cyanobacteriales Rippka & Cohen-Bazire 1983 (Chamaesiphonales, Chroococcales, Chroococcidiopsidales, Coleofasciculales, Desertifilales, Nostocales, Oscillatoriales, Pleurocapsales, Spirulinales, Stigonematales)
  • "Elainellales" Chuvochina et al. 2023
  • "Eurycoccales"
  • Gloeoemargaritales Moreira et al. 2016
  • Leptolyngbyales Strunecký & Mareš 2022 ("Neosynechococcales")
  • "Limnotrichales"
  • Nodosilineales Strunecký & Mareš 2022
  • Oculatellales Strunecký & Mareš 2022
  • "Phormidesmidales" corrig. Chuvochina et al. 2023
  • Prochlorococcaceae Komárek & Strunecky 2020 {"PCC-6307"}
  • Prochlorotrichales Strunecký & Mareš 2022 [PCC-9006]
  • Pseudanabenales Hoffmann, Komárek & Kastovsky 2005
  • Synechococcales Hoffmann, Komárek & Kastovsky 2005
  • Thermostichales Komárek & Strunecký 2020

Clade "Thermotogida"

Phylum Atribacterota

• Class Atribacteria Katayama et al. 2021 (OP9)
  • Atribacterales Katayama et al. 2021 ("Caldatribacteriales")

Phylum Synergistota

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

Phylum "Lithacetigenota"

• Class "Lithacetigenia"
  • "Lithacetigenales"

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 "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

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 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 [UBA1400]
  • "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" [UBA2591]
  • "Uhrbacterales"
  • "Veblenbacterales" (RIF39)
• Class "Paceibacteria" Chuvochina et al. 2023
  • "Azambacterales"
  • Clade UBA6257
  • Clade UBA9983
  • Clade UBA9983_A
  • ?"Montesolbacterales"
  • "Moranbacterales" (OD1-i)
  • "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

Phylum "Bipolaricaulota"

• Class "Bipolaricaulia" Chuvochina et al. 2023
  • "Bipolaricaulales" Chuvochina et al. 2023 (KB1 group, OP1)
  • "Fraserbacterales" [GTDB tag: RIF31; RBG-16-55-9]

Phylum Deinococcota

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

Clade Hydrobacterida

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 [UBA6266]
  • "Ancaeobacterales" Williams et al. 2022
  • "Theseobacterales" Williams et al. 2022
• Class "Auribacteria" Williams et al. 2022 [SURF-26]
  • "Auribacterales" Williams et al. 2022
• Class "Erginobacteria" Williams et al. 2022 [PUNC01]
  • "Erginobacterales" Williams et al. 2022
• Class "Tritonobacteria" Williams et al. 2022 [UBA1439]
  • "Tritonobacterales" Williams et al. 2022

Phylum "Omnitrophota"

• Class "Omnitrophia" (OP3)
  • "Omnitrophales"
• Class "Velamenicoccia" Pallen, Rodriguez-R & Alikhan 2022 [Koll11]
  • ?"Kappaeales" Seymour et al. 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 [UBA10183]
  • "Gygaeellales" Seymour et al. 2023 [GIF10]
  • "Candidatus Orphnella" Williams et al. 2021 {JABMRG01: JABMRG01}
  • "Kaelpiales" Seymour et al. 2022 [4484-49]
  • "Pluralincolimonadales" Seymour et al. 2022
  • "Taenaricolales" Seymour et al. 2022
  • "Tantalellales" Seymour et al. 2022 [SKK-01]
  • "Velamenicoccales" Pallen, Rodriguez-R & Alikhan 2022 [UBA1572]
  • "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" Cavalier-Smith 2020 ex Chuvochina et al. 2023
  • Leptospirales corrig. Gupta et al. 2014
  • "Turneriellales" Chuvochina et al. 2023
• Class "Brevinematia" Chuvochina et al. 2023
  • Brevinematales Gupta et al. 2014
• Class "Brachyspiria" corrig. Chuvochina et al. 2023
  • 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. 2023
  • Spirochaeta cellobiosiphila Breznak & Warnecke 2008 {DSM-17781: DSM-17781}
  • "Entomospirales" Pallen, Rodriguez-R & Alikhan 2022 [WRBN01]
  • "Marispirochaetales" Pallen, Rodriguez-R & Alikhan 2022 [JC444]
  • "Salinispirales" Pallen, Rodriguez-R & Alikhan 2022 [DSM-27196]
  • "Sediminispirochaetales" Pallen, Rodriguez-R & Alikhan 2022 [DSM-16054]
  • "Sphaerochaetales" Chuvochina et al. 2023
  • Spirochaeta thermophila Aksenova et al. 1992 {Spirochaetales_A}
  • Spirochaetales_E
  • "Treponematales" Song et al. 2021 ex Chuvochina et al. 2023

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
• 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 [Hat2]
  • 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 [incl. Tichowtungiales]
  • "Spyradenecales" Pallen, Rodriguez-R & Alikhan 2022 [RFP12]
• Class "Verrucomicrobiia" Oren, Parte & Garrity 2016 ex Cavalier-Smith 2020
  • Opitutales Choo et al. 2007 (Puniceicoccales)
  • "Limisphaerales" Podosokorskaya et al. 2023
  • "Methylacidiphilales" Op den Camp 2009 ["Pedosphaerales"]
  • 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 "Neomarinimicrobiota"

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

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
  • ?"Palaucibacterales" Aldeguer-Riquelme, Antón & Santos 2022 [PAUC43f]
  • Gemmatimonadales Zhang et al. 2003
  • Longimicrobiales Pascual et al. 2016

Phylum "Hydrothermota"

• Class "Stahlbacteria" (WOR-3)
• 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 [LBFQ01]

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)
• Class Chitinivibrionia Sorokin et al. 2014
  • Chitinivibrionales Sorokin et al. 2014 ["Chitinispirillales"]
• Class Fibrobacteria Spain et al. 2012
  • Fibrobacterales Spain et al. 2012 ["Fibromonadales"]

Phylum "Electryoneota"

• Class "Electryoneia" Williams et al. 2022
  • Electryoneales Williams et al. 2022
  • 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 2020
  • 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 [Marinilabiliales; "Sulfidibacteriales"]
  • Chitinophagales Munoz, Rossello-Mora & Amann 2017 [Saprospirales]
  • Cytophagales Leadbetter 1974 [Cyclobacteriales]
  • Flavobacteriales Bernardet 2012
  • Sphingobacteriales Kämpfer 2012

Clade Proteobacteria

Phylum "Canglongiota"