list of bacterial orders 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). bacteria chloroflexota "dormibacteraeota" clade 1 armatimonadota eremiobacterota firmicutes firmicutes e firmicutes g bacillota s.s. "desulfotomaculota" (bacillota b) "selenobacteria" (bacillota c) firmicutes d "halanaerobiaeota" (bacillota f) firmicutes a "actinobacteriobiontes" deinococcota actinomycetota cyanoprokaryota "margulisbacteria" cyanobacteria "cpr" "patescibacteria" "thermotogida" "synergistetes" synergistota "thermocalda" dictyoglomota caldisericota "thermodesulfobiota" coprothermobacterota "bipolaricaulota" thermotogota "fusobacterida" fusobacteriota "calescamantes" "dependentiae" campylobacterota "spirochaetobacteriobiontes" "mcinerneyibacteriota" "muirbacteria" "wallbacteria" "riflebacteria" "lindowbacteria" spirochaetota "scotobacteriobiontes" "aerophobetes" "atribacterota" "desantisbacteria" "goldbacteria" "firestonebacteria" elusimicrobiota ("hydrobacteria") "ratteibacteria" "omnitrophicota" "aureabacteria" chlamydiota verrucomicrobiota "sumerlaeota" "poribacteria" "abyssubacteria" "hydrogenedentes" "coatesbacteria" planctomycetota "fcb group" ⊞⊟ "latescibacteria" "edwardsbacteria" "zixibacteria" "krumholzibacteria" "eisenbacteria" "fermentibacteria" gemmatimonadota "hydrothermota" "cloacimonetes" fibrobacterota "delongbacteria" calditrichota "marinisomatota" bacteroidota "proteobacteria" ⊞⊟ "aquificida" acidobacterota chrysiogenota deferribacterota "thermosulfidibacterota" aquificota "modulibacteria" "methylomirabilota" "schekmanbacteria" "tectomicrobia" nitrospinota nitrospirota "anoxydeltabacteria" "dadabacteria" syntrophorhabdia "acidulidesulfobacterales" "desulfobacterota" "deferrisomatota" "binatota" myxococcota "lambdaproteobacteria" bdellovibrionota "leptospirillia" desulfovibrionia pseudomonadota "terrabacteria" "planctobacteria" clade terrabacteria phylum chloroflexota phylogeny of chloroflexota "limnocylindria" "limnocylindrales" ktedonobacteria ktedonobacterales "dehalococcoidotia" dehalococcoidales tepidiformales dehalococcoidia "caldilineotia" ardenticatenales "caldilineidae" caldilineales "anaerolineidae" thermoflexales "promineofilales" aggregatilineales anaerolineales "caldilineia" "chloroflexotia" "thermobaculales" thermomicrobiales chloroflexales chloroflexia class "bathosphaeria" mehrshad et al. 2018 ?"bathosphaerales" mehrshad et al. 2018 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 anaerolineales yamada et al. 2006 ardenticatenales kawaichi et al. 2013 caldilineales yamada et al. 2006 ?"phototrophicales" zheng et al. 2022 "promineifilales" corrig. 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) montgomery et al. 2021 (ad3) "aeolococcales" montgomery et al. 2021 "dormibacterales" (sic) montgomery et al. 2021 phylum armatimonadota phylogeny of armatimonadota abditibacteriia abditibacteriales fimbriimonadia fimbriimonadales chthonomonadetes chthonomonadales armatimonadia armatimonadales capsulimonadales class uba5829 ?uba5829 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 phylogeny of eremiobacterota "xenobia" "xenobiales" "eremiobacteriia" "eremiobacterales" "baltobacterales" 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 "eremiobacterales" ward, cardona & holland-moritz 2019 firmicutes incertae sedis class "desulfitisporia" sorokin & merkel 2021 "desulfitisporales" sorokin & merkel 2021 class thermolithobacteria sokolova et al. 2007 thermolithobacterales sokolova et al. 2007 phylum firmicutes e phylogeny of bacillota e "symbiobacteriia" "symbiobacteriales" "thermaerobacteria" "thermaerobacterales" "sulfobacillia" "sulfobacillales" class "symbiobacteriia" wang et al. 2021 "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 "hydrogenisporia" pallen, rodriguez-r & alikhan 2022 "capillibacteriales" pallen, rodriguez-r & alikhan 2022 "hydrogenisporales" pallen, rodriguez-r & alikhan 2022 phylum "selenobacteria" phylogeny of selenobacteria acidaminococcales veillonellales sporomusales_a "sporomusales" "anaeromusales" umgs1260 "propionisporales" "dendrosporobacterales" selenomonadales 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" phylogeny of desulfotomaculota 003054495 "carboxydocellales" z‑2901 "carboxydothermales" "thermincolia" "thermincolales" "desulfotomaculia" "ammonificales" "desulfotomaculales" "moorellia" "desulfitibacterales" "calderihabitantales" "thermacetogeniales" moorellales "syntrophomonadia" "syntrophomonadales" "dehalobacteriia" "dehalobacteriales" "avidehalobacterales" "cryptoclostridiales" "peptococcia" "thermanaerosceptrales" "peptococcales" "desulfitobacteriia" "heliobacteriales" "desulfitobacteriales" class "carboxydocellia" pallen, rodriguez-r & alikhan 2022 "carboxydocellales" class "carboxydothermia" pallen, rodriguez-r & alikhan 2022 "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" "avidehalobacterales" pallen, rodriguez-r & alikhan 2022 "cryptoclostridiales" pallen, rodriguez-r & alikhan 2022 "dehalobacteriales" class "peptococcia" "peptococcales" "thermanaerosceptrales" pallen, rodriguez-r & alikhan 2022 class "desulfitobacteriia" "desulfitobacteriales" "heliobacteriales" cavalier-smith 2020 phylum firmicutes d phylogeny of bacillota d "proteinivoracia" "proteinivoracales" "dethiobacteria" "dethiobacterales" "natranaerobiia" natranaerobiales class "proteinivoracia" "proteinivoracales" class "dethiobacteria" "dethiobacterales" class "natranaerobiia" sorokin et al. 2021 natranaerobiales mesbah et al. 2007 phylum "halanaerobiaeota" phylogeny of halanaerobiia "anoxybacterales" halanaerobiales "halobacteroidales" class "halanaerobiia" cavalier-smith 2020 "anoxybacterales" pallen, rodriguez-r & alikhan 2022 halanaerobiales corrig. rainey & zhilina 1995 "halobacteroidales" phylum firmicutes a phylogeny of bacillota a "thermosediminibacteria" koleobacterales thermosediminibacterales "thermoanaerobacteria" "caldicellulosiruptorales" thermoanaerobacterales clostridiia "lutisporales" clostridiales eubacteriales tissierellales "peptostreptococcales" "mahellales" "caldicoprobacterales" "christensenellales" "merdicolales" "egerieisomatales" "saccharofermentanales" "acetivibrionales" "petroclostridiales" "avimonoglobales" "monoglobales" "oscillospirales" "lachnospirales" 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" "avimonoglobales" pallen, rodriguez-r & alikhan 2022 "caldicoprobacterales" "christensenellales" parks et al. 2018 clostridiales prevot 1953 s.s. "egerieisomatales" pallen, rodriguez-r & alikhan 2022 eubacteriales buchanan 1917 "lachnospirales" "lutisporales" "mahellales" "merdicolales" pallen, rodriguez-r & alikhan 2022 "monoglobales" "oscillospirales" "petroclostridiales" pallen, rodriguez-r & alikhan 2022 "peptostreptococcales" "saccharofermentanales" tissierellales alauzet et al. 2020 phylum "bacillota" phylogeny of bacillota "bacillia" "kyrpidiales" "tumebacillales" "alicyclobacillales" "desulfuribacillales" bacillales f "pasteuriales" "calditerricolales" "thermicanales" "brockiales" "thermoactinomycetales" "tepidibacillales" "paenibacillales" "aneurinibacillales" "brevibacillales" "caldalkalibacillales" "rubeoparvulales" "exiguobacterales" "harrysmithimonadales" "bacillidae" caryophanales "caldibacillales" jc228 bacillales b bacillales bacillales c bacillales d bacillales e bacillales g bacillales h "staphylococcales" "erysipelotrichidae" culicoidibacterales haloplasmatales_a haloplasmatales "bathyoplasmales" "izemoplasmatales" acholeplasmatales rfn20 erysipelotrichales "aphodocolales" mycoplasmatales lactobacillales class "bacillia" cavalier-smith 2020 "alicyclobacillales" "aneurinibacillales" "bacillidae" cavalier-smith 2020 non enderlein 1917 "caldibacillales" pallen, rodriguez-r & alikhan 2022 calidifontibacillus adiguzel et al. 2020 caryophanales peshkoff 1939 bacillales b bacillales d bacillales e bacillales g bacillales h bacillales prevot 1953 s.s. jc228 bacillales f "brevibacillales" "brockiales" pallen, rodriguez-r & alikhan 2022 "caldalkalibacillales" "calditerricolales" "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 "izimaplasmatales" corrig. zheng et al. 2021 mycoplasmatales freundt 1955 (entomoplasmatales, mycoplasmoidales) rfn20 turicibacteraceae verbarg et al. 2020 "exiguobacterales" corrig. glendinning et al. 2020 "harrysmithimonadales" pallen, rodriguez-r & alikhan 2022 "kyrpidiales" lactobacillales ludwig, schleifer & whitman 2010 "paenibacillales" "pasteuriales" pallen, rodriguez-r & alikhan 2022 "rubeoparvulales" "staphylococcales" "tepidibacillales" "thermicanales" du et al. 2022 "thermoactinomycetales" "tumebacillales" phylum deinococcota "deinococcia" cavalier-smith 2020 deinococcales rainey et al. 1997 (thermales) (radio-resistant micrococci) phylum actinomycetota phylogeny of actinomycetota "geothermincolia" fen-727 "geothermincolales" "humimicrobiia" "hakubellales" "humimicrobiales" "aquicultoria" "aquicultorales" uba3085 "geothermocultorales" "subteraquimicrobiales" coriobacteriia coriobacteriales rubrobacteria rubrobacterales thermoleophilia gaiellales miltoncostaeales thermoleophilales acidimicrobiia "actinomarinales" acidimicrobiales actinomycetia nitriliruptoridae euzebyales nitriliruptorales actinobacteridae actinomycetales "nanopelagicales" jiangellales propionibacteriales acidothermales streptosporangiales mycobacteriales sporichthyales motilibacterales streptomycetales 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 coriobacteriia könig 2013 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 class "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 phylum "margulisbacteria" phylogeny of margulisbacteria "saganbacteria" "termititenacia" "riflemargulisbacteria" "marinamargulisbacteria" 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 "cyanobacteriota" phylogeny of cyanobacteriota "sericytochromatia" uba7694 s15b-mn24 "melainabacteria" "caenarcanales" "obscuribacterales" "vampirovibrionales" "gastranaerophilales" cyanobacteria "gloeobacteria" gloeobacterales "phycobacteria" gloeoemargaritales pcc-6307 "eurycoccales" pseudanabenales "thermosynechococcales" "limnotrichales" pcc-9006 synechococcales "elainellales" "phormidesmiales" "neosynechococcales" "leptolyngbyales" cyanobacteriales class "sericytochromatia" soo et al. 2017 (gtdb tag: s15b-mn24) 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 phylogeny of patescibacteria "wirthbacteria" (cg2-30-54-11) "microgenomates" "dojkabacteria" "katanobacteria" "microgenomatia" ⊞⊟ "woykebacterales" "curtissbacterales" "daviesbacterales" "roizmanbacterales" (uba1406) "gottesmanbacterales" (uba10105) "levybacterales" "shapirobacterales" (uba12405) gwa2-44-7 uba1400 cluster "gracilibacteria" "absconditabacteria" "gracilibacteria" ⊞⊟ "absconditabacterales" "gracilibacterales" (bd1-5) "abawacabacterales" (rbg-16-42-10) "peregrinibacterales" (uba1369) "fertabacterales" (uba4473) "peribacterales" cluster "saccharibacteria" "kazanbacteria" (kazan) "howlettbacteria" "saccharimonadia" cluster "parcubacteria" "berkelbacteria" "andersenbacteria" "doudnabacteria" "torokbacteria" (gca-2792135) aby1 ⊞⊟ "kerfeldbacterales" (sbbc01) "veblenbacterales" "uhrbacterales" (gwa2-46-9) "magasanikbacterales" "moisslbacterales" (uba2591) "falkowbacterales" "buchananbacterales" "kuenenbacterales" (uba2196) "jacksonbacterales" (uba9629) "komeilibacterales" (uba1558) "paceibacteria" ⊞⊟ "moranbacterales" uba9983_a uba6257 "yanofskybacterales" (2-02-full-40-12) "azambacterales" (uba10092) "sungbacterales" "ryanbacterales" uba9983 "terrybacterales" "spechtbacterales" "portnoybacterales" "parcunitrobacterales" (gwa2-38-13b) "paceibacterales" cluster phylum "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" "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" phylum thermotogota phylogeny of thermotogota mesoaciditogales petrotogales thermotogales 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 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 phylogeny of spirochaetota "leptospirae" "turneriellales" leptospirales "leptospiria" "euspirochaetae" brevinematales brachyspirales spirochaetia "borreliales" wrbn01 dsm-17781 spirochaetales e spirochaetales a dsm-27196 jc444 dsm-16054 "sphaerochaetales" "treponematales" 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"