List of bacterial orders

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 07-RS207 (8th April 2022).

Clade Terrabacteria

Phylum

Chloroflexota

* Class ?"Bathosphaeria" Mehrshad et al. 2018
** " Bathosphaerales" Mehrshad et al. 2018 TDB tag: JG30-KF-CM66* 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
** Anaerolineales Yamada et al. 2006
** Ardenticatenales Kawaichi et al. 2013
** Caldilineales Yamada et al. 2006
** " Promineofilales"
** Thermoflexales Dodsworth et al. 2014
* Class Chloroflexia Gupta et al. 2013
** Chloroflexales Gupta et al. 2013 (Herpetosiphonales, Kallotenuales)
** " Thermobaculales"
** Thermomicrobiales Garrity & Holt 2002 ( Sphaerobacterales)

Phylum Dormibacteraeota

* Class "Dormibacteria" (sic) (AD3)
** " Dormibacterales" (sic)

Clade 1

Phylum Armatimonadota

* Class Abditibacteriia Tahon et al. 2018 (FBP)
** Abditibacteriales Tahon et al. 2018
* 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 "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
** " Eremiobacterales" Ward, Cardona & Holland-Moritz 2019

Clade Firmicutes

Firmicutes incertae sedis

* Class Thermolithobacteria Sokolova et al. 2007
** Thermolithobacterales Sokolova et al. 2007

Phylum Firmicutes E

* Class "Symbiobacteriia"
** " Symbiobacteriales"
* Class "Sulfobacillia"
** " Sulfobacillales" Cavalier-Smith 2020
* Class "Thermaerobacteria"
** " Thermaerobacterales"

Phylum Firmicutes G

* Class Limnochordia Watanabe, Kojima & Fukui 2015
** Limnochordales Watanabe, Kojima & Fukui 2015
* Class UBA4882
** '' Capillibacterium'' Ungkulpasvich et al. 2021
** '' Hydrogenispora'' Liu et al. 2014

Phylum " Selenobacteria"

* Class Selenomonadia Oren, Parte & Garrity 2016
** Acidaminococcales Campbell, Adeolu & Gupta 2015
** " Anaeromusales"
** " Dendrosporobacterales"
** " Propionisporales"
** Selenomonadales Marchandin et al. 2010
** " Sporomusales" Cavalier-Smith 2006
** " Acetonemaceae"
** "'' Pelorhabdus''"
** Veillonellales Campbell, Adeolu & Gupta 2015

Phylum " Desulfotomaculota"

* Class 003054495
** " Carboxydocellales"
* Class Z-2901
** " Carboxydothermales"
* Class "Thermincolia"
** " Thermincolales"
* Class "Desulfotomaculia" Watanabe, Fukui & Kuever 2020
** " Ammonificales"
** " Desulfotomaculales" Watanabe, Fukui & Kuever 2020
* Class "Moorellia"
** " Calderihabitantales"
** " Desulfitibacterales"
** Moorellales Lv et al. 2020
** " Thermacetogeniales"
* Class "Syntrophomonadia"
** " Syntrophomonadales"
* Class "Dehalobacteriia"
** "''Candidatus'' Avidehalobacter" Gilroy et al. 2021
** "''Candidatus'' Cryptoclostridium" Glendinning et al. 2020
** " Dehalobacteriales"
* Class "Peptococcia"
** " Peptococcales"
** '' Thermanaerosceptrum'' corrig. Hamilton-Brehm et al. 2021
* Class "Desulfitobacteriia"
** " Desulfitobacteriales"
** " Heliobacteriales" Cavalier-Smith 2020

Phylum Firmicutes D

* Class "Proteinivoracia"
** " Proteinivoracales"
* Class "Dethiobacteria"
** " Dethiobacterales"
* Class "Natranaerobiia" Sorokin et al. 2021
** Natranaerobiales Mesbah et al. 2007

Phylum " Halanaerobiaeota"

* Class "Halanaerobiia" Cavalier-Smith 2020
** '' Anoxybacter'' Zeng et al. 2015
** Halanaerobiales corrig. Rainey & Zhilina 1995
** " Halobacteroidales"

Phylum Firmicutes A

* Class "Thermosediminibacteria"
** " Koleobacterales" Sakamoto et al. 2021
** Thermosediminibacterales Zhang et al. 2019
* Class "Thermoanaerobacteria"
** " Caldicellulosiruptorales"
** Thermoanaerobacterales Wiegel 2010
* Class Clostridiia Rainey 2010 em. Cavalier-Smith 2020
** " Acetivibrionales"
** " Caldicoprobacterales"
** " Christensenellales"
** Clostridiales Prevot 1953 s.s.
** "''Candidatus'' Egerieisoma" Gilroy et al. 2021
** Eubacteriales Buchanan 1917
** " Lachnospirales"
** " Lutisporales"
** " Mahellales"
** " Monoglobales"
** " Oscillospirales"
** '' Petroclostridium'' Zhang et al. 2018b
** " Peptostreptococcales"
** " Saccharofermentanales"
** TANB77
** Tissierellales Alauzet et al. 2020
** UBA1381

Phylum "

Bacillota"

* Class " Bacillia" Cavalier-Smith 2020
** " Alicyclobacillales"
** " Aneurinibacillales"
** "Bacillidae" Cavalier-Smith 2020 non Enderlein 1917
*** "Caldibacillaceae"
*** '' Calidifontibacillus'' Adiguzel et al. 2020
*** Caryophanales Peshkoff 1939 acillales A*** Bacillales B
*** Bacillales D
*** Bacillales E
*** Bacillales G
*** Bacillales H
*** Bacillales Prevot 1953 s.s.
*** JC228
** Bacillales F
** " Brevibacillales"
** " Caldalkalibacillales"
** " Calditerricolales"
** " Desulfuribacillales"
** DSM-22653
** "Erysipelotrichidae" corrig. Cavalier-Smith 2020
*** Acholeplasmatales Freundt et al. 1984 (Anaeroplasmatales)
*** "''Candidatus'' Bathoplasma" 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
*** "Izimaplasmatales" corrig. Zheng et al. 2021
*** Mycoplasmatales Freundt 1955 (Entomoplasmatales, Mycoplasmoidales)
*** RFN20
*** RF39
*** Turicibacteraceae Verbarg et al. 2020
** "Exiguobacterales"
** "''Candidatus'' Harrysmithimonas" Glendinning et al. 2020
** "Kyrpidiales"
** Lactobacillales Ludwig, Schleifer & Whitman 2010
** "Paenibacillales"
** ''Pasteuria'' Metchnikoff 1888
** "Rubeoparvulales"
** "Staphylococcales"
** "Tepidibacillales"
** "Thermicanales"
** "Thermoactinomycetales"
** "Tumebacillales"

Actinobacteriobiontes

Phylum Deinococcota

* "Deinococci, Deinococcia" Cavalier-Smith 2020
** Deinococcales Rainey et al. 1997 (Thermales) (radio-resistant micrococci)

Phylum Actinomycetota

* Class ?"Syntrophaliphaticia" corrig. Liu et al. 2020
* Class "Geothermincolia" Jiao et al. 2021
** Fen-727
** "Geothermincolales" Jiao et al. 2021
* Class "Humimicrobiia" Jiao et al. 2021
** "Hakubanellales" 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
** "Subteraquimicrobiales" Jiao et al. 2021
** UBA3085
* Class Coriobacteridae, Coriobacteriia König 2013
** Coriobacteriales Stackebrandt et al. 1997 (Eggerthellales)
* Class Rubrobacteridae, 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 Acidimicrobidae, Acidimicrobiia Norris 2013
** Acidimicrobiales Stackebrandt, Rainey & Ward-Rainey 1997
** "Actinomarinales" Ghai et al. 2013
* Class "Actinobacteridae, Actinomycetia" Salam et al. 2020
** Acidothermales Sen et al. 2014
** Actinomycetales Buchanan 1917 (Bifidobacteriales; Micrococcales; Kineosporiales)
** Euzebyales Kurahashi et al. 2010 (Egibacterales)
** Jiangellales Tang et al. 2015
** Motilibacterales Salam et al. 2020
** Mycobacteriales Janke 1924 (Corynebacteriales; Actinoplanales; Actinocatenisporales; Antricoccales; Cryptosporangiales; Frankiales; Geodermatophilales; Glycomycetales; Jatrophihabitantales; Micromonosporales; Nakamurellales; Phytomonosporales; Pseudonocardiales)
** "Nanopelagicales" Neuenschwander et al. 2018
** Nitriliruptorales Sorokin et al. 2009 (Egicoccales)
** Propionibacteriales Patrick & McDowell 2015
** Salsipaludibacterales Almeida et al. 2022
** Sporichthyales Nouioui et al. 2018
** Streptomycetales Kampfer 2015 (Catenulisporales)
** Streptosporangiales Goodfellow 2015

Clade Cyanoprokaryota

Phylum "Margulisbacteria"

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

Phylum "Cyanobacteria, Cyanobacteriota"

* Class "Sericytochromatia" Soo et al. 2017 (GTDB tag: S15B-MN24) [incl. "Blackallbacteria" (GTDB tag: UBA7694)]
* Class "Melainabacteria" Soo et al. 2014
** "Caenarcaniphilales" Soo et al. 2014
** "Gastranaerophilales" Soo et al. 2014
** "Obscuribacterales" Soo et al. 2014
** "Vampirovibrionales" Soo et al. 2015
* Class Gloeobacteria
** Gloeobacterales Cavalier-Smith 2002
* Class Phycobacteria
** Cyanobacteriales Rippka & Cohen-Bazire 1983 (Chamaesiphonales, Chroococcales, Chroococcidiopsidales, Nostocales, Oscillatoriales, Pleurocapsales, Spirulinales, Stigonematales)
** "Elainellales"
** "Eurycoccales"
** Gloeoemargaritales Moreira et al. 2016
** "Leptolyngbyales"
** "Limnotrichales"
** "Neosynechococcales"
** "Phormidesmiales"
** Prochlorococcaceae Komárek & Strunecky 2020
** Prochlorotrichaceae Burger-Wiersma et al. 1989
** Pseudanabenales Hoffmann, Komárek & Kastovsky 2005
** Synechococcales Hoffmann, Komárek & Kastovsky 2005
** Thermostichales Komárek & Strunecký 2020
** "Thermosynechococcales"

Clade Candidate Phyla Radiation

Phylum "Elulimicrobiota, Elulota"

* Class "Elulimicrobia" 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
** Clade UBA1400
** "Curtissbacterales"
** "Daviesbacterales"
** "Gottesmanbacterales"
** "Levybacterales"
** "Roizmanbacterales"
** "Shapirobacterales"
** "Woykebacterales" (RIF34)
* Class "Absconditabacteria"
** "Absconditabacterales" (SR1)
** "BD1-5" (GN02)
* Class "Gracilibacteria"
** "Abawacabacterales" (RIF46)
** "Fertabacterales" (DOLZORAL124_38_8)
** "Peregrinibacterales" (PER)
** "Peribacterales"
* Class "Kazanbacteria" (Kazan)
* Class "Howlettbacteria" (CPR2)
* Class "Saccharimonadia" (TM7)
** "Saccharimonadales" corrig. McLean et al. 2020
* Class "Berkelbacteria" (ACD58)
* 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"
** "Azambacterales"
** Clade UBA6257
** Clade UBA9983
** Clade UBA9983_A
** "Montesolbacterales"
** "Moranbacterales" (OD1-i)
** "Paceibacterales"
** "Parcunitrobacterales"
** "Portnoybacterales" (RIF22)
** "Ryanbacterales" (RIF10)
** "Spechtbacterales" (RIF19)
** "Sungbacterales" (RIF17)
** "Tagabacterales" (RIF12)
** "Terrybacterales" (RIF13)
** "Yanofskybacterales"

Clade "Thermotogida"

Phylum Synergistota

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

Phylum Dictyoglomota

* Class Dictyoglomia Patel 2012
** Dictyoglomales Patel 2012

Phylum "Caldisericota"

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

Phylum "Thermodesulfobiota"

* Class "Thermodesulfobiia"
** "Thermodesulfobiales" Cavalier-Smith 2020

Phylum Coprothermobacterota

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

Phylum "Bipolaricaulota"

* Class "Bipolaricaulia"
** "Bipolaricaulales" (KB1 group, OP1)
** "Fraserbacterales" [GTDB tag: RIF31; RBG-16-55-9]

Phylum Thermotogota

* Class "Thermotogae, 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

Spirochaetobacteriobiontes

Phylum "Macinerneyibacteriota"

* Class "Macinerneyibacteria" corrig. Yadav et al. 2020
** "Macinerneyibacteriales" corrig. Yadav et al. 2020

Phylum "Muirbacteria"

* Class "Muirbacteriia"
** "Muirbacteriales"

Phylum "Riflebacteria"

* Class "Ozemibacteriia" corrig. Kadnikov et al. 2018 (RIF32/ACD39)
** "Ozemibacterales" corrig. Kadnikov et al. 2018

Phylum Spirochaetota

* Class "Leptospiria" Cavalier-Smith 2020
** Leptospirales Gupta et al. 2014
** "Turneriellales"
* Class "Brevinematia"
** Brevinematales Gupta et al. 2014
* Class "Brachyspirae"
** Brachyspirales corrig. Gupta et al. 2014
* Class Spirochaetia Paster 2020
** ''Sediminispirochaeta'' Shivani et al. 2016
** ''Spirochaeta cellobiosiphila'' Breznak & Warnecke 2008
** DSM-27196
** ''Marispirochaeta'' Shivani et al. 2017
** "''Entomospira''" Grana-Miraglia et al. 2020 non Enderlein 1917
** "Borreliales"
** "Sphaerochaetales"
** Spirochaetales Buchanan 1917
** ''Spirochaeta thermophila'' Aksenova et al. 1992
** Spirochaetales_E
** "Treponematales" Song et al. 2021

Clade "Fusobacterida"

Phylum Fusobacteriota

* Class Fusobacteriia corrig. Staley & Whitman 2012
** Fusobacterales Staley & Whitman 2012

Phylum "Calescamantes"

* Class "Calescibacteriia" (EM19)
** "Calescibacteriales"

Phylum "Dependentiae"

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

Phylum Campylobacterota

* Class Desulfurellia Waite et al. 2020
** Desulfurellales Kuever, Rainey & Widdel 2006
* Class "Campylobacteria" Oren, Parte & Garrity 2016 ex Waite et al. 2017
** Campylobacterales Garrity, Bell & Lilburn 2006
** Nautiliales Miroshnichenko et al. 2004

Scotobacteriobiontes

Clade 2

Phylum "Aerophobetes"

* Class "Aerophobia" (CD12)
** "Aerophobales"

Phylum Atribacterota

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

Clade 3

Phylum Elusimicrobiota

* Class "Elusimicrobiia" Oren, Parte & Garrity 2016 ex Cavalier-Smith 2020 (TG1)
** "Elusimicrobiales" Geissinger et al. 2010
* Class "Endomicrobia" (sic) Stingl et al. 2018
** "Endomicrobiales" Zheng et al. 2018

Clade Planctobacteria

Phylum "Omnitrophica"

* Class "Omnitrophia" (OP3)
** "Omnitrophales"
* Class Koll11 (OP3)
** "''Candidatus'' Omnitrophus magneticus" Kolinko et al. 2016
** "''Candidatus'' Velamenicoccus" Kizina et al. 2022

Phylum Chlamydiota

* Class Chlamydiia Horn 2011
** 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 Tichowtungiia Mu et al. 2020
** Tichowtungiales Mu et al. 2020
* Class Kiritimatiellae Spring et al. 2017
** "''Candidatus'' Spyradenecus" Gilroy et al. 2021
** Kiritimatiellales Spring et al. 2017
* Class "Verrucomicrobiia" Oren, Parte & Garrity 2016 ex Cavalier-Smith 2020
** "Chthoniobacterales" Sangwan et al. 2004 (Terrimicrobiales)
** Opitutales Choo et al. 2007 (Puniceicoccales)
** "Pedosphaerales"
** "Methylacidiphilales" Op den Camp 2009
** Verrucomicrobiales Ward-Rainey et al. 1996 em. Yoon et al. 2008

Phylum "Saltatorellota"

* Class "Saltatorellae" Wiegand et al. 2019
** "Saltatorellales" Wiegand et al. 2019

Phylum "Sumerlaeota"

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

Phylum "Poribacteria"

* Class "Entoporibacteria" Podell et al. 2019
* Class "Pelagiporibacteria" Podell et al. 2019

Phylum "Hydrogenedentes"

* Class "Hydrogenedentia" (NKB19)
** "Hydrogenedentales"

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 Phycisphaerae, 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

Clade FCB group

Phylum "Marinimicrobia"

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

Phylum "Latescibacteria"

* Class "Handelsmanbacteria" (RIF27)
* Class "Latescibacteria"
** "Latescibacterales" (WS3)

Phylum "Krumholzibacteriota"

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

Phylum "Fermentibacteria"

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

Phylum Gemmatimonadota

* Class "Glassbacteria" (RIF5)
* Class Gemmatimonadetes Zhang et al. 2003
** Gemmatimonadales Zhang et al. 2003
** Longimicrobiales Pascual et al. 2016

Phylum "Hydrothermota"

* Class "Stahlbacteria" (WOR-3)
* Class "Hydrothermia" Chuvochina et al. 2019
** "Hydrothermales" Chuvochina et al. 2019 (EM3)
** LBFQ01 ["Pyropristinus" Colman et al. 2016]

Phylum "Cloacimonetes"

* Class "Cloacimonadia"
** "Cloacimonadales" (WWE1)

Phylum Fibrobacterota

* Class "Raymondbacteria" (RIF7)
* Class Chitinivibrionia
** Chitinivibrionales Sorokin et al. 2014 ("Chitinispirillales")
* Class Fibrobacteria
** Fibrobacterales Spain et al. 2012 ("Fibromonadales")

Phylum Calditrichota

* Class "Calditrichia" Cavalier-Smith 2020
** Calditrichales Kublanov et al. 2020

Phylum "Marinisomatota"

* Class "Marinisomatia"
** "Marinisomatales" (SAR406)

Phylum Bacteroidota

* Class "Kapabacteria" (OPB56)
** "Kapabacteriales"
* Class "Kryptonia"
** "Kryptoniales"
* Class "Ignavibacteria, Ignavibacteriia" Oren, Parte & Garrity 2016 ex Cavalier-Smith 2020
** Ignavibacteriales Iino et al. 2010
* Class "Chlorobia, 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]
** Chitinophagales Munoz, Rossello-Mora & Amann 2017 [Saprospirales]
** Cytophagales Leadbetter 1974 [Cyclobacteriales]
** Flavobacteriales Bernardet 2012
** Sphingobacteriales Kämpfer 2012
** "Sulfidibacteriales" Leng, Zhao & Xia 2022

Clade Proteobacteria

Phylum Acidobacteriota

* Class "Fischerbacteria" (RIF25)
* Class "Polarisedimenticolia" Flieder et al. 2021
** "Polarisedimenticolales" Flieder et al. 2021
* Class "Holophagae, Holophagia" Oren, Parte & Garrity 2016
** Acanthopleuribacterales Fukunaga et al. 2008
** Holophagales Fukunaga et al. 2008
** Thermotomaculales Dedysh & Yilmaz 2018
* Class "Aminicenantia"
** "Aminicenantales" Kadnikov et al. 2019 (OP8)
* Class "Guanabacteria" (sic) Tschoeke et al. 2020
** "Guanabaribacteriales" corrig. Tschoeke et al. 2020
* Class Thermoanaerobaculia Dedysh & Yilmaz 2018
** Thermoanaerobaculales Dedysh & Yilmaz 2018
* Class Vicinamibacteria Dedysh & Yilmaz 2018
** Vicinamibacterales Dedysh & Yilmaz 2018
* Class Blastocatellia Pascual et al. 2016
** Blastocatellales Pascual et al. 2016
** "Chloracidobacteriales"
* Class Acidobacteriia Thrash & Coates 2010
** Acidobacteriales Cavalier-Smith 2002
** "Acidoferrales" Epihov et al. 2021
** Bryobacterales Dedysh & Yilmaz 2018

Phylum "Chrysiogenota"

* Class Chrysiogenetes Garrity & Holt 2002
** Chrysiogenales Garrity & Holt 2002

Phylum Deferribacterota

* Class Deferribacteres Huber & Stetter 2002 em. Jumas-Bilak et al. 2009
** Deferribacterales Huber & Stetter 2002

Phylum "Thermosulfidibacterota"

* Class "Thermosulfidibacteria" Cavalier-Smith 2020
** "Thermosulfidibacterales" Cavalier-Smith 2020

Phylum Aquificota

* Class "Desulfurobacteriia"
** Desulfurobacteriales Gupta & Lali 2014
* Class "Aquificae, Aquificia" Oren, Parte & Garrity 2016 ex Cavalier-Smith 2020
** Aquificales Reysenbach 2002 emend. Gupta & Lali 2013
** "Hydrogenothermales"

Phylum "Modulibacteria"

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

Phylum "Methylomirabilaeota"

* Class "Methylomirabilia"
** ""Methylomirabilales"
** "Rokubacteriales"

Phylum "Tectomicrobia"

* Class "Entotheonellia"
** "Entotheonellales" Schmidt et al. 2000

Phylum Nitrospinota

* Class "Nitrospinia" Lucker et al. 2013
** "Nitrospinales" Lucker et al. 2013

Phylum Nitrospirota

* Class "Thermodesulfovibrionia" Umezawa et al. 2021
** "Thermodesulfovibrionales" Umezawa et al. 2021
* Class "Nitrospiria" Oren et al. 2015
** "Nitrospirales" Garrity & Holt 2001
** "Troglogloeales" Yu et al. 2022

Phylum Desulfobacterota G

* Class Syntrophorhabdia Waite et al. 2020
** Syntrophorhabdales Waite et al. 2020

Phylum SZUA-79

* Class SZUA-79
** "Acidulidesulfobacterales" corrig. Tan et al. 2019

Phylum Desulfobacterota

* Class Desulfuromonadia Waite et al. 2020
** Desulfuromonadales corrig. Kuever, Rainey & Widdel 2006
** Geobacterales Waite et al. 2020
* Class "Zymogeniia" corrig. Murphy et al. 2021
** "Zymogeniales" Murphy et al. 2021
* Class Desulfomonilia Waite et al. 2020
** Desulfomonilales Waite et al. 2020
* Class Syntrophia Waite et al. 2020
** Syntrophales Waite et al. 2020
* Class Desulfobaccia Waite et al. 2020
** Desulfobaccales Waite et al. 2020
* Class Desulfarculia Waite et al. 2020
** "Adiutricales" Waite et al. 2020
** Desulfarculales corrig. Kuever, Rainey & Widdel 2006
* Class Desulfofervidia Waite et al. 2020
** "Desulfofervidales" Waite et al. 2020
* Class Dissulfuribacteria Waite et al. 2020
** Dissulfuribacterales Waite et al. 2020
* Class Thermodesulfobacteria, Thermodesulfobacteriia Hatchikian, Ollivier & Garcia 2002 em. Cavalier-Smith 2020
** Thermodesulfobacteriales Hatchikian, Ollivier & Garcia 2002
* Class Desulfobulbia Waite et al. 2020
** Desulfobulbales Waite et al. 2020
* Class Syntrophobacteria Waite et al. 2020
** Syntrophobacterales Waite et al. 2020
* Class DSM-4660
** Desulfatiglanales Waite et al. 2020
* Class Desulfobacteria Waite et al. 2020
** Desulfobacterales Kuever, Rainey & Widdel 2006

Phylum "Deferrisomatota"

* Class "Anaeroferrophilia" corrig. Murphy et al. 2021
** "Anaeroferrophilales" Murphy et al. 2021
* Class "Deferrisomatia" Waite et al. 2020
** Deferrisomatales Waite et al. 2020

Phylum "Binatota"

* Class "Binatia" Chuvochina et al. 2019
** "Binatales" Chuvochina et al. 2019

Phylum Myxococcota

* Class Myxococcia Waite et al. 2020
** Myxococcales (fruiting gliding bacteria)
* Class "Bradymonadia"
** Bradymonadales Wang et al. 2015
* Class Polyangia Waite et al. 2020
** Haliangiales Waite et al. 2020
** Nannocystales (Reichenbach 2007) Waite et al. 2020
** Polyangiales Tchan, Pochon & Prevot 1948

Phylum SAR324

* Class Lambdaproteobacteria Anantharaman et al. 2016 (RIF24)

Phylum Bdellovibrionota

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

Phylum Leptospirillaeota

*Class "Leptospirillia"
** "Leptospirillales"

Phylum Desulfobacterota_I

* Class Desulfovibrionia Waite et al. 2020
** Desulfovibrionales Kuever, Rainey & Widdel 2006

Phylum Pseudomonadota

* Class "Magnetococcia" Parks et al. 2018
** Magnetococcales Bazylinski et al. 2013
* Class "Mariprofundia" Cavalier-Smith 2020 ["Zetaproteobacteria"]
** Mariprofundales Makita et al. 2017
* Class Alphaproteobacteria, Caulobacteria" Oren, Parte & Garrity 2016 ex Cavalier-Smith 2020
** Bartonellaceae Gieszczykiewicz 1939
** "''Candidatus'' Enterousia" Gilroy et al. 2021
** Holosporales Szokoli et al. 2016
** "Pelagibacterales" Grote et al. 2012
** "''Candidatus'' Scatocola" Gilroy et al. 2021
** Sublass "Rickettsiidae" corrig. Ferla et al. 2013
*** Rickettsiales Gieszczykiewicz 1939 emend. Dumler et al. 2001
** Sublass "Caulobacteridae" Ferla et al. 2013
*** Clade UBA8366
*** "Acetobacterales"
*** "Caedimonadales"
*** "Azospirillales"
*** Caulobacterales Henrici & Johnson 1935 (Hyphomonadales; Maricaulales; Parvularculales)
*** "Dongiales"
*** "Elsterales"
*** "Ferrovibrionales"
*** "Geminicoccales"
*** Hyphomicrobiales Douglas 1957 (Rhizobiales)
*** ''Inquilinus'' Coenye et al. 2002
*** Kiloniellales Wiese et al. 2009
*** "Methylospongiales" Podell et al. 2020
*** Micropepsales Harbison et al. 2016
*** "Micavibrionales"
*** Minwuiales Sun et al. 2018
*** "Oceanibaculales"
*** "Paracaedibacterales"
*** "Parvibaculales"
*** "Planktothermales" Zhou et al. 2020
*** "Puniceispirillales"
*** "Reyranellales"
*** Rhodobacterales Garrity, Bell & Lilburn 2006
*** Rhodospirillales Pfennig & Truper 1971
*** Sphingomonadales Yabuuchi & Kosako 2006 (Emcibacterales; Iodidimonadales; Kordiimonadales; Rhodothalassiales)
*** Sneathiellales Kurahashi et al. 2008
*** Stellaceae Hördt et al. 2020
*** ''Tagaea'' Jean et al. 2016
*** "Thalassobaculales"
*** "Tistrellales"
*** "Zavarziniales"
* Class Gammaproteobacteria, Pseudomonadia" Oren, Parte & Garrity 2016
** ?"Ferritrophicales" Weiss et al. 2007
** ?"Kopriimonadales" Kwon et al. 2005c
** ?"Tethybacterales" Taylor et al. 2021
** "Thiohalorhabdales"
** Subclass "Acidithiobacillidae" Cavalier-Smith 2020
*** Acidithiobacillales Garrity, Bell & Lilburn 2005
** Subclass "Neisseriidae" Cavalier-Smith 2020 (Betaproteobacteria)
*** Burkholderiales Garrity, Bell & Lilburn 2006 ("Ferrovales"; "Gallionellales"; Hydrogenophilales; Methylophilales; Neisseriales; Nitrosomonadales; "Procabacteriales"; Rhodocyclales; Spirillales; Sulfuricellales)
** Subclass "Pseudomonadidae" Cavalier-Smith 2020
*** "Taraoceanobacteraceae" Zhou et al. 2020
*** Acidiferrobacterales Kojima, Shinohara & Fukui 2015
*** ''Aquicella'' Santos et al. 2004
*** Arenicellales Teramoto, Yagyu & Nishijima 2015
*** Beggiatoales Buchanan 1957
*** "Berkiellales"
*** Cardiobacteriales Garrity, Bell & Lilburn 2005
*** Chromatiales Imhoff 2005
*** "Competibacterales"
*** "Coxiellales"
*** "Diplorickettsiales"
*** "Ectothiorhodospirales"
*** Enterobacteriaceae_A
*** Enterobacterales Adeolu et al. 2016 (Aeromonadales; Alteromonadales; Kangiellales; Orbales; Pasteurellales; Vibrionales)
*** "Evansiales"
*** "Francisellales"
*** "Granulosicoccales"
*** "Halofilales"
*** "Halothiobacillales"
*** Immundisolibacterales Corteselli, Aitken & Singleton 2017
*** ''Inmirania'' Slobodkina et al. 2016
*** Legionellales Garrity, Bell & Lilburn 2005
*** Methylococcales Bowman 2005
*** "''Ca.'' Macondimonas" Karthikeyan et al. 2019
*** Nevskiales Naushad et al. 2015 ("Salinisphaerales")
*** "Nitrococcales"
*** "Nitrosococcales"
*** ''Pelagibaculum'' Knobloch et al. 2019
*** "Piscirickettsiales"
*** "Porisulfidales"
*** Pseudomonadales Orla-Jensen 1921 (Cellvibrionales; Moraxellales; Oceanospirillales)
*** "''Candidatus'' Reidiella" Russell et al. 2019
*** "Riflewellaceae" Zhou et al. 2020
*** "Steroidobacterales"
*** ''Sulfuriflexus'' Kojima & Fukui 2016
*** "Tenderiales"
*** ''Thioalbus'' Park et al. 2011
*** Thioalkalispiraceae Mori K et al. 2011
*** "Thioglobaceae"
*** ''Thiogranum'' Mori et al. 2015
*** "Thiohalobacterales"
*** "Thiohalomonadales"
*** "Thiohalospirales"
*** "Thiomicrospirales"
*** "''Candidatus'' Thiopontia" van Vliet et al. 2020
*** Thiotrichales Garrity, Bell & Lilburn 2005
*** "Woeseiales"
*** Xanthomonadales Saddler & Bradbury 2005 non Chadefaud 1950a (Lysobacterales)

List of Candidate Phyla

* "Canglongiota" Zhang et al. 2022
* "Fervidibacteria" Rinke et al. 2013 (OctSpa1-106)
* "Heilongiota" Zhang et al. 2022
* "Qinglongiota" Zhang et al. 2022
* "Salinosulfoleibacteria" Tazi et al. 2006
* "Teskebacteria" Dojka 1998 (WS1)
* "Tharpellota" Speth et al. 2022
** "Tharpellales" Speth et al. 2022

See also

* Branching order of bacterial phyla (Woese, 1987)
* Branching order of bacterial phyla (Gupta, 2001)
* Branching order of bacterial phyla (Cavalier-Smith, 2002)
* Branching order of bacterial phyla (Rappe and Giovanoni, 2003)
* Branching order of bacterial phyla (Battistuzzi et al.,2004)
* Branching order of bacterial phyla (Ciccarelli et al., 2006)
* Branching order of bacterial phyla after ARB Silva Living Tree
* Branching order of bacterial phyla (Genome Taxonomy Database, 2018)
* Bacterial phyla
* List of Archaea genera
* List of bacteria genera
* LPSN, list of accepted bacterial and archaeal names
* Human microbiome project
* Microorganism

References

{{Bacteria classification
Taxonomic lists (orders), Bacterial orders
Bacteria orders, List of