List of genera included in orders

Beggiatoales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order Thiotrichales.
Note: The classification of the genus Beggiatoa Trevisan 1842 (Approved Lists 1980) in the order Thiotrichales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Bifidobacteriales
Aeriscardovia - Alloscardovia - Bifidobacterium - Gardnerella - Metascardovia - Parascardovia - Scardovia

Burkholderiales
Achromobacter - Acidovorax - Advenella - Albidiferax - Alcaligenes - Alicycliphilus - Aquabacterium - Aquincola - Azohydromonas - Bordetella - Brachymonas - Brackiella - Burkholderia - Caenibacterium - Caenimonas - Caldimonas - Castellaniella - Chitinimonas - Collimonas - Comamonas - Cupriavidus - Curvibacter - Delftia - Derxia - Diaphorobacter - Duganella - Giesbergeria - Herbaspirillum - Herminiimonas - Hydrogenophaga - Hylemonella - Ideonella - Inhella - Janthinobacterium - Kerstersia - Lampropedia - Lautropia - Leptothrix - Limnobacter - Macromonas - Malikia - Massilia - Methylibium - Mitsuaria - Naxibacter - Oligella - Ottowia - Oxalicibacterium - Oxalobacter - Pandoraea - Parasutterella - Paucibacter - Paucimonas - Pelistega - Pelomonas - Pigmentiphaga - Piscinibacter - Polaromonas - Polynucleobacter - Pseudacidovorax - Pseudorhodoferax - Pusillimonas - Ralstonia - Ramlibacter - Rhodoferax - Rivibacter - Roseateles - Rubrivivax - Schlegelella - Simplicispira - Sphaerotilus - Sutterella - Taylorella - Telluria - Tepidicella - Tepidimonas - Tetrathiobacter - Thermothrix - Thiobacter - Thiomonas - Undibacterium - Variovorax - Verminephrobacter - Wautersia - Xenophilus - Xylophilus

Caldilineales
Caldilinea

Caldisericales
Caldisericum

Campylobacterales
Arcobacter - Campylobacter - Dehalospirillum - Helicobacter - Hydrogenimonas - Sulfuricurvum - Sulfurimonas - Sulfurospirillum - Sulfurovum - Thiovulum - Wolinella

Cardiobacteriales
Cardiobacterium - Dichelobacter - Suttonella

Caryophanales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order Bacillales.
Note: The classification of the genus Caryophanon Peshkoff 1939 (Approved Lists 1980) in the order Bacillales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Caulobacterales
Asticcacaulis - Brevundimonas - Caulobacter - Hellea - Henriciella - Hirschia - Hyphomonas - Maribaculum - Maricaulis - Oceanicaulis - Phenylobacterium - Ponticaulis - Robiginitomaculum - Woodsholea

Cenarchaeales
"Cenarchaeum"

Chlamydiales
Chlamydia - Chlamydophila - Neochlamydia - Parachlamydia - Simkania - Waddlia

Chlorobiales
Ancalochloris - Chlorobaculum - Chlorobium - Chloroherpeton - Pelodictyon - Prosthecochloris

"Chloroflexales"
Chloroflexus - Chloronema - Heliothrix - Oscillochloris - Roseiflexus

Chromatiales
Alkalilimnicola - Alkalispirillum - Allochromatium - Amoebobacter - Aquisalimonas - Arhodomonas - Chromatium - Ectothiorhodosinus - Ectothiorhodospira - Granulosicoccus - Halochromatium - Halorhodospira - Halothiobacillus - Isochromatium - Lamprobacter - Lamprocystis - Marichromatium - Natronocella - Nitrococcus - Nitrosococcus - Pfennigia - Rhabdochromatium - Rheinheimera - Thermochromatium - Thioalkalibacter - Thioalkalicoccus - Thioalkalispira - Thioalkalivibrio - Thiobaca - Thiocapsa - Thiococcus - Thiocystis - Thiodictyon - Thiofaba - Thioflavicoccus - Thiohalocapsa - Thiohalospira - Thiolamprovum - Thiopedia - Thiophaeococcus - Thiorhodococcus - Thiorhodospira - Thiorhodovibrio - Thiospirillum - Thiovirga

Chroococcales
Microcystis (not validly published) - Rubidibacter

Chrysiogenales
Chrysiogenes - Desulfurispirillum

Clostridiales
Acetanaerobacterium - Acetitomaculum - Acetivibrio - Acetobacterium - Acetonema - Acidaminobacter - Acidaminococcus - Alkalibacter - Alkaliphilus - Allisonella - Aminiphilus - Anaeroarcus - Anaerobacter - Anaerobaculum - Anaerobranca - Anaerococcus - Anaerofilum - Anaerofustis - Anaeroglobus - Anaeromusa - Anaerosinus - Anaerosphaera - Anaerosporobacter - Anaerostipes - Anaerotruncus - Anaerovibrio - Anaerovirgula - Anaerovorax - Anoxynatronum - Blautia - Butyricicoccus - Butyrivibrio - Caldicellulosiruptor - Caldicoprobacter - Caloramator - Caloranaerobacter - Caminicella - Carboxydocella - Carboxydothermus - Catonella - Centipeda - Clostridiisalibacter - Clostridium - Coprococcus - Cryptanaerobacter - Dehalobacter - Dendrosporobacter - Desulfitibacter - Desulfitobacterium - Desulfonispora - Desulfosporosinus - Desulfotomaculum - Desulfurispora - Dethiobacter - Dethiosulfatibacter - Dialister - Dorea - Ethanoligenens - Eubacterium - Faecalibacterium - Fastidiosipila - Fervidicola - Filifactor - Finegoldia - Flavonifractor - Fusibacter - Gallicola - Garciella - Geosporobacter - Gracilibacter - Guggenheimella - Helcococcus - Heliobacillus - Heliobacterium - Heliophilum - Heliorestis - Hespellia - Howardella - Hydrogenoanaerobacterium - Johnsonella - Lachnobacterium - Lachnospira - Lactonifactor - Lutispora - Marvinbryantia - Megamonas - Megasphaera - Mitsuokella - Mogibacterium - Moryella - Natronincola - Oribacterium - Oscillibacter - Oscillospira - Oxobacter - Papillibacter - Parasporobacterium - Parvimonas - Pectinatus - Pelosinus - Pelospora - Pelotomaculum - Peptococcus - Peptoniphilus - Peptostreptococcus - Phascolarctobacterium - Propionispira - Propionispora - Proteiniborus - Proteocatella - Pseudobutyrivibrio - Pseudoflavonifractor - Pseudoramibacter - Quinella - Robinsoniella - Roseburia - Ruminococcus - Sarcina - Schwartzia - Sedimentibacter - Selenomonas - Shuttleworthia - Soehngenia - Sporacetigenium - Sporanaerobacter - Sporobacter - Sporobacterium - Sporolituus - Sporomusa - Sporotalea - Subdoligranulum - Succiniclasticum - Succinispira - Sulfobacillus - Syntrophobotulus - Syntrophococcus - Syntrophomonas - Syntrophospora - Syntrophothermus - Tepidibacter - Tepidimicrobium - Thermaerobacter - Thermincola - Thermobrachium - Thermohalobacter - Thermohydrogenium - Thermosinus - Thermosyntropha - Thermotalea - Thermoterrabacterium - Tindallia - Tissierella - Veillonella - Zymophilus

Note: The classification of the genus Eubacterium Prévot 1938 (Approved Lists 1980) in the order Clostridiales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Coriobacteriales
Adlercreutzia - Asaccharobacter - Atopobium - Collinsella - Coriobacterium - Cryptobacterium - Denitrobacterium - Eggerthella - Enterorhabdus - Gordonibacter - Olsenella - Paraeggerthella - Slackia

Cytophagales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order "Sphingobacteriales".
Note: The classification of the genus Cytophaga Winogradsky 1929 (Approved Lists 1980) in the order "Sphingobacteriales" is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Deferribacterales
Calditerrivibrio - Caldithrix - Deferribacter - Denitrovibrio - Flexistipes - Geovibrio - Mucispirillum
Note: The classification of the genus Geovibrio Caccavo et al. 2000 in the order Deferribacterales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Deinococcales
Deinobacter - Deinococcus - Truepera

Desulfarculales
Desulfarculus

Desulfobacterales
Desulfatibacillum - Desulfatiferula - Desulfatirhabdium - Desulfobacter - Desulfobacterium - Desulfobacula - Desulfobotulus - Desulfobulbus - Desulfocapsa - Desulfocella - Desulfococcus - Desulfofaba - Desulfofrigus - Desulfofustis - Desulfoluna - Desulfomusa - Desulfonema - Desulfopila - Desulforegula - Desulforhopalus - Desulfosarcina - Desulfospira - Desulfotalea - Desulfotignum - Desulfurivibrio - Nitrospina

Desulfovibrionales
Bilophila - Desulfocurvus - Desulfohalobium - Desulfomicrobium - Desulfomonas - Desulfonatronospira - Desulfonatronovibrio - Desulfonatronum - Desulfonauticus - Desulfothermus - Desulfovermiculus - Desulfovibrio - Lawsonia

Desulfurellales
Desulfurella - Hippea

Desulfurococcales
Aeropyrum - Desulfurococcus - Hyperthermus - Ignicoccus - Ignisphaera - Pyrodictium - Pyrolobus - Staphylothermus - Stetteria - Sulfophobococcus - Thermodiscus - Thermosphaera

Desulfuromonadales
Desulfuromonas - Desulfuromusa - Geoalkalibacter - Geobacter - Geopsychrobacter - Geothermobacter - Malonomonas - Pelobacter - Trichlorobacter

"Dictyoglomales"
Dictyoglomus

Elusimicrobiales
Elusimicrobium

"Enterobacteriales"
Arsenophonus - Biostraticola - Brenneria - Buchnera - Budvicia - Buttiauxella - Calymmatobacterium - Cedecea - Citrobacter - Cronobacter - Dickeya - Edwardsiella - Enterobacter - Erwinia - Escherichia - Ewingella - Hafnia - Klebsiella - Kluyvera - Leclercia - Leminorella - Levinea - Mangrovibacter - Moellerella - Morganella - Obesumbacterium - Pantoea - Pectobacterium - Photorhabdus - Plesiomonas - Pragia - Proteus - Providencia - Rahnella - Raoultella - Saccharobacter - Salmonella - Samsonia - Serratia - Shigella - Sodalis - Tatumella - Thorsellia - Trabulsiella - Wigglesworthia - Xenorhabdus - Yersinia - Yokenella

Entomoplasmatales
Entomoplasma - Mesoplasma - Spiroplasma

Erysipelotrichales
Allobaculum - Bulleidia - Catenibacterium - Coprobacillus - Erysipelothrix - Holdemania - Solobacterium - Turicibacter

Eubacteriales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order Clostridiales.
Note: The classification of the genus Eubacterium Prévot 1938 (Approved Lists 1980) in the order Clostridiales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

"Fibrobacterales"
Fibrobacter

"Flavobacteriales"
Actibacter - Aequorivita - Aestuariicola - Algibacter - Aquimarina - Arenibacter - Bergeyella - Bizionia - Blattabacterium - Brumimicrobium - Capnocytophaga - Cellulophaga - Chryseobacterium - Cloacibacterium - Coenonia - Costertonia - Croceibacter - Croceitalea - Crocinitomix - Cryomorpha - Dokdonia - Donghaeana - Elizabethkingia - Empedobacter - Epilithonimonas - Eudoraea - Flagellimonas - Flaviramulus - Flavobacterium - Fluviicola - Formosa - Fulvibacter - Gaetbulibacter - Gaetbulimicrobium - Galbibacter - Gelidibacter - Gillisia - Gilvibacter - Gramella - Hyunsoonleella - Jejuia - Joostella - Kaistella - Kordia - Kriegella - Krokinobacter - Lacinutrix - Leeuwenhoekiella - Leptobacterium - Lishizhenia - Lutaonella - Lutibacter - Lutimonas - Maribacter - Mariniflexile - Maritimimonas - Marixanthomonas - Meridianimaribacter - Mesoflavibacter - Mesonia - Muricauda - Myroides - Nonlabens - Olleya - Ornithobacterium - Owenweeksia - Persicivirga - Pibocella - Planobacterium - Polaribacter - Pseudozobellia - Psychroflexus - Psychroserpens - Riemerella - Robiginitalea - Salegentibacter - Salinimicrobium - Sandarakinotalea - Sediminibacter - Sediminicola - Sediminitomix - Sejongia - Stanierella - Stenothermobacter - Subsaxibacter - Subsaximicrobium - Tamlana - Tenacibaculum - Ulvibacter - Vitellibacter - Wandonia - Wautersiella - Weeksella - Winogradskyella - Yeosuana - Zeaxanthinibacter - Zhouia - Zobellia - Zunongwangia

"Fusobacteriales"
Cetobacterium - Fusobacterium - Ilyobacter - Leptotrichia - Propionigenium - Psychrilyobacter - Sebaldella - Sneathia - Streptobacillus

Gemmatimonadales
Gemmatimonas

Geovibriales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order Deferribacterales.
Note: The classification of the genus Geovibrio Caccavo et al. 2000 in the order Deferribacterales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Gloeobacterales
No validly published genus name included in this order

Halanaerobiales
Acetohalobium - Halanaerobacter - Halanaerobaculum - Halanaerobium - Halobacteroides - Halocella - Haloincola - Halonatronum - Halothermothrix - Natroniella - Orenia - Selenihalanaerobacter - Sporohalobacter

Halobacteriales
Haladaptatus - Halalkalicoccus - Haloarcula - Halobacterium - Halobaculum - Halobiforma - Halococcus - Haloferax - Halogeometricum - Halomicrobium - Halopiger - Haloplanus - Haloquadratum - Halorhabdus - Halorubrum - Halosarcina - Halosimplex - Halostagnicola - Haloterrigena - Halovivax - Natrialba - Natrinema - Natronobacterium - Natronococcus - Natronolimnobius - Natronomonas - Natronorubrum

Haloplasmatales
Haloplasma

"Herpetosiphonales"
Herpetosiphon

Holophagales
Geothrix - Holophaga

Hydrogenophilales
Hydrogenophilus - Petrobacter - Tepidiphilus - Thiobacillus

Hyphomicrobiales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order Rhizobiales.
Note: The classification of the genus Hyphomicrobium Stutzer and Hartleb 1899 (Approved Lists 1980) in the order Rhizobiales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Kiloniellales
Kiloniella

Kordiimonadales
Kordiimonas

Ktedonobacterales
Ktedonobacter

Lactobacillales
Abiotrophia - Acetoanaerobium - Aerococcus - Agitococcus - Alkalibacterium - Allofustis - Alloiococcus - Atopobacter - Atopococcus - Atopostipes - Bavariicoccus - Carnobacterium - Catellicoccus - Desemzia - Dolosicoccus - Dolosigranulum - Enterococcus - Eremococcus - Facklamia - Fructobacillus - Globicatella - Granulicatella - Ignavigranum - Isobaculum - Lacticigenium - Lactobacillus - Lactococcus - Lactosphaera - Lactovum - Leuconostoc - Marinilactibacillus - Melissococcus - Oenococcus - Paralactobacillus - Pediococcus - Pilibacter - Sharpea - Streptococcus - Symbiobacterium - Tetragenococcus - Trichococcus - Vagococcus - Weissella

Legionellales
Aquicella - Coxiella - Fluoribacter - Legionella - Rickettsiella - Sarcobium - Tatlockia

Lentisphaerales
Lentisphaera

Lysobacterales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order Xanthomonadales.
Note: The classification of the genus Lysobacter Christensen and Cook 1978 (Approved Lists 1980) in the order Xanthomonadales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Methanobacteriales
Methanobacterium - Methanobrevibacter - Methanosphaera - Methanothermobacter - Methanothermus

Methanocellales
Methanocella

Methanococcales
Methanocaldococcus - Methanococcus - Methanothermococcus - Methanotorris

Methanomicrobiales
Methanocalculus - Methanocorpusculum - Methanoculleus - Methanofollis - Methanogenium - Methanolacinia - Methanolinea - Methanomicrobium - Methanoplanus - Methanosphaerula - Methanospirillum

Methanopyrales
Methanopyrus

Methanosarcinales
Halomethanococcus - Methanimicrococcus - Methanococcoides - Methanohalobium - Methanohalophilus - Methanolobus - Methanomethylovorans - Methanosaeta - Methanosalsum - Methanosarcina - Methanothrix - Methermicoccus

Methylococcales
Crenothrix - Methylobacter - Methylocaldum - Methylococcus - Methylohalobius - Methylomicrobium - Methylomonas - Methylosarcina - Methylosoma - Methylosphaera - Methylothermus

Methylophilales
Methylobacillus - Methylophilus - Methylotenera - Methylovorus

Micrococcales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order Actinomycetales.

Mycobacteriales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order Actinomycetales.

Mycoplasmatales
Eperythrozoon - Haemobartonella - Mycoplasma - Ureaplasma

Myxococcales
Anaeromyxobacter - Angiococcus - Archangium - Byssovorax - Chondromyces - Corallococcus - Cystobacter - Enhygromyxa - Haliangium - Hyalangium - Jahnella - Kofleria - Melittangium - Myxococcus - Nannocystis - Phaselicystis - Plesiocystis - Polyangium - Pyxidicoccus - Sorangium - Stigmatella

Natranaerobiales
Natranaerobius - Natronovirga

Nautiliales
Caminibacter - Lebetimonas - Nautilia - Nitratifractor - Nitratiruptor - Thioreductor

Neisseriales
Alysiella - Andreprevotia - Aquaspirillum - Aquitalea - Bergeriella - Chitinibacter - Chitinilyticum - Chitiniphilus - Chromobacterium - Conchiformibius - Deefgea - Eikenella - Formivibrio - Gulbenkiania - Iodobacter - Jeongeupia - Kingella - Laribacter - Leeia - Microvirgula - Morococcus - Neisseria - Paludibacterium - Prolinoborus - Pseudogulbenkiania - Silvimonas - Simonsiella - Stenoxybacter - Uruburuella - Vitreoscilla - Vogesella

Nitriliruptorales
Nitriliruptor

Nitrosomonadales
Gallionella - Nitrosolobus - Nitrosomonas - Nitrosospira - Spirillum
Note: The classification of the genus Spirillum Ehrenberg 1832 (Approved Lists 1980) in the order Nitrosomonadales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

"Nitrospirales"
Leptospirillum - Nitrospira - Thermodesulfovibrio

Nostocales
No validly published genus name included in this order

Oceanospirillales
Aidingimonas - Alcanivorax - Amphritea - Balneatrix - Bermanella - Carnimonas - Chromohalobacter - Cobetia - Deleya - Endozoicomonas - Fundibacter - Hahella - Halomonas - Halospina - Halotalea - Halovibrio - Kangiella - Kushneria - Litoricola - Marinomonas - Marinospirillum - Modicisalibacter - Neptuniibacter - Neptunomonas - Nitrincola - Oceaniserpentilla - Oceanobacter - Oceanospirillum - Oleiphilus - Oleispira - Pseudospirillum - Reinekea - Saccharospirillum - Salicola - Salinicola - Spongiispira - Thalassolituus - Volcaniella - Zooshikella - Zymobacter

Opitutales
Alterococcus - Opitutus

Oscillatoriales
Crinalium (not validly published) - Halospirulina - Limnothrix (not validly published) - Planktothricoides - Planktothrix (not validly published) - Tychonema (not validly published)

"Parvularculales"
Parvularcula

Pasteurellales
Actinobacillus - Aggregatibacter - Avibacterium - Basfia - Bibersteinia - Chelonobacter - Gallibacterium - Haemophilus - Histophilus - Lonepinella - Mannheimia - Nicoletella - Pasteurella - Phocoenobacter - Volucribacter

Phycisphaerales
Phycisphaera

Picrophilales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order Thermoplasmatales.
Note: The classification of the genus Picrophilus Schleper et al. 1996 in the order Thermoplasmatales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Planctomycetales
Blastopirellula - Gemmata - Isosphaera - Pirellula - Planctomyces - Rhodopirellula - Schlesneria - Singulisphaera - Zavarzinella

Pleurocapsales
No validly published genus name included in this order

"Procabacteriales"
No validly published genus name included in this order

Prochlorales
Prochloron - Prochlorococcus - Prochlorothrix

Pseudomonadales
Acinetobacter - Alkanindiges - Azomonas - Azomonotrichon - Azorhizophilus - Azotobacter - Branhamella - Cellvibrio - Chryseomonas - Dasania - Enhydrobacter - Flavimonas - Mesophilobacter - Moraxella - Perlucidibaca - Pseudomonas - Psychrobacter - Rhizobacter - Rugamonas - Serpens

Puniceicoccales
Cerasicoccus - Coraliomargarita - Pelagicoccus - Puniceicoccus

Rhizobiales
Afifella - Afipia - Agrobacterium - Agromonas - Albibacter - Allorhizobium - Aminobacter - Amorphus - Ancalomicrobium - Ancylobacter - Anderseniella - Angulomicrobium - Aquabacter - Aquamicrobium - Aurantimonas - Azorhizobium - Balneimonas - Bartonella - Beijerinckia - Blastobacter - Blastochloris - Bosea - Bradyrhizobium - Brucella - Carbophilus - Chelatobacter - Chelatococcus - Cohaesibacter - Crabtreella - Cucumibacter - Daeguia - Defluvibacter - Devosia - Dichotomicrobium - Ensifer - Filomicrobium - Fulvimarina - Gemmiger - Grahamella - Hoeflea - Hyphomicrobium - Kaistia - Labrys - Maritalea - Martelella - Meganema - Mesorhizobium - Methylobacterium - Methylocapsa - Methylocella - Methylocystis - Methylopila - Methylorhabdus - Methylosinus - Methylovirgula - Microvirga - Mycoplana - Nitratireductor - Nitrobacter - Ochrobactrum - Oligotropha - Parvibaculum - Pedomicrobium - Phyllobacterium - Pleomorphomonas - Prosthecomicrobium - Protomonas - Pseudaminobacter - Pseudochrobactrum - Pseudolabrys - Pseudoxanthobacter - Rhizobium - Rhodobium - Rhodoblastus - Rhodomicrobium - Rhodoplanes - Rhodopseudomonas - Rochalimaea - Roseomonas - Roseospirillum - Salinarimonas - Seliberia - Sinorhizobium - Starkeya - Terasakiella - Xanthobacter - Zhangella
Note: The classification of the genus Hyphomicrobium Stutzer and Hartleb 1899 (Approved Lists 1980) in the order Rhizobiales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Rhodobacterales
Ahrensia - Albimonas - Albidovulum - Amaricoccus - Antarctobacter - Catellibacterium - Citreicella - Citreimonas - Dinoroseobacter - Donghicola - Gaetbulicola - Gemmobacter - Haematobacter - Jannaschia - Ketogulonicigenium - Labrenzia - Leisingera - Loktanella - Lutimaribacter - Maribius - Marinovum - Maritimibacter - Marivita - Methylarcula - Nautella - Nereida - Nesiotobacter - Oceanibulbus - Oceanicola - Octadecabacter - Palleronia - Pannonibacter - Paracoccus - Pelagibaca - Pelagicola - Phaeobacter - Ponticoccus - Pseudorhodobacter - Pseudoruegeria - Pseudovibrio - Rhodobaca - Rhodobacter - Rhodothalassium - Rhodovulum - Roseibaca - Roseibacterium - Roseibium - Roseicyclus - Roseinatronobacter - Roseisalinus - Roseivivax - Roseobacter - Roseovarius - Rubellimicrobium - Rubribacterium - Rubrimonas - Ruegeria - Sagittula - Salinihabitans - Salipiger - Sediminimonas - Seohaeicola - Shimia - Silicibacter - Staleya - Stappia - Sulfitobacter - Tateyamaria - Thalassobacter - Thalassobius - Thalassococcus - Thioclava - Thiosphaera - Tranquillimonas - Tropicibacter - Tropicimonas - Wenxinia - Yangia

Rhodocyclales
Azoarcus - Azonexus - Azospira - Azovibrio - Dechloromonas - Dechlorosoma - Denitratisoma - Ferribacterium - Methyloversatilis - Propionibacter - Propionivibrio - Quatrionicoccus - Rhodocyclus - Shinella - Sterolibacterium - Thauera - Uliginosibacterium - Zoogloea

Rhodospirillales
Acetobacter - Acidicaldus - Acidiphilium - Acidisoma - Acidisphaera - Acidocella - Acidomonas - Ameyamaea - Asaia - Azospirillum - Belnapia - Caenispirillum - Conglomeromonas - Craurococcus - Defluviicoccus - Fodinicurvata - Gluconacetobacter - Gluconobacter - Granulibacter - Inquilinus - Insolitispirillum - Kozakia - Magnetospirillum - Marispirillum - Muricoccus - Nisaea - Neoasaia - Novispirillum - Oceanibaculum - Paracraurococcus - Pelagibius - Phaeospirillum - Rhodocista - Rhodopila - Rhodospira - Rhodospirillum - Rhodovarius - Rhodovibrio - Roseococcus - Roseospira - Rubritepida - Saccharibacter - Skermanella - Stella - Swaminathania - Tanticharoenia - Teichococcus - Telmatospirillum - Thalassobaculum - Thalassospira - Tistrella - Zavarzinia

Rickettsiales
Aegyptianella - Anaplasma - Cowdria - Ehrlichia - Holospora - Lyticum - Neorickettsia - Orientia - Pseudocaedibacter - Rickettsia - Symbiotes - Tectibacter - Wolbachia

Rubrobacterales
Rubrobacter

"Salinisphaerales"
Salinisphaera

Sneathiellales
Sneathiella

Solirubrobacterales
Conexibacter - Patulibacter - Solirubrobacter

Sphaerobacterales
Sphaerobacter

"Sphingobacteriales"
Algoriphagus - Aquiflexum - Arcicella - Aureispira - Balneola - Belliella - Chimaereicella - Chitinophaga - Cyclobacterium - Cytophaga - Dyadobacter - Echinicola - Effluviibacter - Emticicia - Fabibacter - Ferruginibacter - Filimonas - Flammeovirga - Flavisolibacter - Flectobacillus - Flexibacter - Flexithrix - Gracilimonas - Haliscomenobacter - Hongiella - Hymenobacter - Lacibacter - Larkinella - Leadbetterella - Lewinella - Limibacter - Marinicola - Marinoscillum - Meniscus - Microscilla - Mucilaginibacter - Niabella - Niastella - Nubsella - Olivibacter - Parapedobacter - Parasegetibacter - Pedobacter - Perexilibacter - Persicitalea - Persicobacter - Pontibacter - Pseudosphingobacterium - Rapidithrix - Reichenbachiella - Rhodonellum - Rhodothermus - Roseivirga - Rudanella - Runella - Salinibacter - Salisaeta - Saprospira - Sediminibacterium - Segetibacter - Solitalea - Sphingobacterium - Spirosoma - Sporocytophaga - Terrimonas - Thermonema - Adhaeribacter
Note: The classification of the genus Cytophaga Winogradsky 1929 (Approved Lists 1980) in the order "Sphingobacteriales" is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Sphingomonadales
Altererythrobacter - Blastomonas - Croceicoccus - Erythrobacter - Erythromicrobium - Erythromonas - Novosphingobium - Porphyrobacter - Rhizomonas rejected name - Sandaracinobacter - Sandarakinorhabdus - Sphingobium - Sphingomonas - Sphingopyxis - Sphingosinicella - Zymomonas

Spirillales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order Nitrosomonadales.
Note: The classification of the genus Spirillum Ehrenberg 1832 (Approved Lists 1980) in the order Nitrosomonadales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Spirochaetales
Borrelia - Brachyspira - Brevinema - Clevelandina - Cristispira - Diplocalyx - Exilispira - Hollandina - Leptonema - Leptospira - Pillotina - Serpulina - Spirochaeta - Treponema - Turneriella

Stigonematales
No validly published genus name included in this order

Streptomycetales
Order not widely accepted by the community of microbiologists. The type genus of the order is classified in the order Actinomycetales.

Sulfolobales
Acidianus - Desulfurolobus - Metallosphaera - Stygiolobus - Sulfolobus - Sulfurisphaera - Sulfurococcus

Synergistales
Aminobacterium - Aminomonas - Anaerobaculum - Cloacibacillus - Dethiosulfovibrio - Jonquetella - Pyramidobacter - Synergistes - Thermovirga - Thermanaerovibrio

Syntrophobacterales
Desulfacinum - Desulfobacca - Desulfoglaeba - Desulfomonile - Desulforhabdus - Desulfovirga - Smithella - Syntrophobacter - Syntrophorhabdus - Syntrophus - Thermodesulforhabdus

Thermales
Marinithermus - Meiothermus - Oceanithermus - Thermus - Vulcanithermus

Thermoanaerobacterales
Acetogenium - Ammonifex - Caldanaerobacter - Caldanaerobius - Caldanaerovirga - Carboxydibrachium - Coprothermobacter - Desulfovirgula - Gelria - Mahella - Moorella - Sporotomaculum - Tepidanaerobacter - Thermacetogenium - Thermanaeromonas - Thermoanaerobacter - Thermoanaerobacterium - Thermoanaerobium - Thermobacteroides - Thermodesulfobium - Thermosediminibacter - Thermovenabulum

Thermococcales
Palaeococcus - Pyrococcus - Thermococcus

Thermodesulfobacteriales
Caldimicrobium - Thermodesulfatator - Thermodesulfobacterium

Thermoleophilales
Thermoleophilum

Thermolithobacterales
Thermolithobacter

Thermomicrobiales
Thermomicrobium

Thermoplasmatales
Acidiplasma - Ferroplasma - Picrophilus - Thermogymnomonas - Thermoplasma
Note: The classification of the genus Picrophilus Schleper et al. 1996 in the order Thermoplasmatales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Thermoproteales
Caldivirga - Pyrobaculum - Thermocladium - Thermofilum - Thermoproteus - Vulcanisaeta

Thermotogales
Fervidobacterium - Geotoga - Kosmotoga - Marinitoga - Petrotoga - Thermosipho - Thermotoga

Thiotrichales
Achromatium - Beggiatoa - Caedibacter - Cycloclasticus - Fangia - Francisella - Hydrogenovibrio - Leucothrix - Methylophaga - Piscirickettsia - Sulfurivirga (?) - Thioalkalimicrobium - Thiobacterium - Thiomargarita - Thiomicrospira - Thioploca - Thiospira - Thiothrix
Note: The classification of the genus Beggiatoa Trevisan 1842 (Approved Lists 1980) in the order Thiotrichales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Verrucomicrobiales
Akkermansia - Haloferula - Luteolibacter - Persicirhabdus - Prosthecobacter - Roseibacillus - Rubritalea - Verrucomicrobium

"Vibrionales"
Aliivibrio - Allomonas - Beneckea - Catenococcus - Enterovibrio - Grimontia - Listonella - Lucibacterium - Photobacterium - Salinivibrio - Vibrio

Victivallales
Victivallis

Xanthomonadales
Alkanibacter - Aquimonas - Arenimonas - Aspromonas - Dokdonella - Dyella - Frateuria - Fulvimonas - Hydrocarboniphaga - Ignatzschineria - Luteibacter - Luteimonas - Lysobacter - Nevskia - Pseudoxanthomonas - Rhodanobacter - Rudaea - Silanimonas - Singularimonas - Sinobacter - Stenotrophomonas - Steroidobacter - Thermomonas - Wohlfahrtiimonas - Xanthomonas - Xylella
Note: The classification of the genus Lysobacter Christensen and Cook 1978 (Approved Lists 1980) in the order Xanthomonadales is not in accordance with the Rules of the Bacteriological Code (1990 Revision).

Genera unassigned to a named order
Alkalimonas - Bryobacter - Congregibacter - Dehalogenimonas - Elioraea - Fulvivirga - Gallaecimonas - Geminicoccus - Gilvimarinus - Marinifilum - Methylohalomonas - Methylonatrum - Prolixibacter - Sedimenticola - Simiduia - Solimonas - Spongiibacter - Thiohalobacter - Thiohalomonas - Thiohalophilus - Thiohalorhabdus - Toxothrix - Umboniibacter

See also the following files:
. Classification of prokaryotes (bacteria): Introduction
. Classification of orders