List of taxa with candidatus status

This is a list of taxa with Candidatus status. For taxa not covered by this list, see also:

• the GenBank taxonomy for "effective" names as published;
• the Candidatus Lists and LPSN for latinate names, some sanitized to match the Code.

Phyla

• "Ca. Absconditabacteria" (previously Candidate phylum SR1)
• ABY1 aka OD1-ABY1, subgroup of OD1 ("Ca. Parcubacteria")
• Candidate phylum AC1
• "Ca. Acetothermia" (previously Candidate phylum OP1)
• "Ca. Aerophobetes" (previously Candidate phylum CD12 or BHI80-139)
• "Ca. Aminicenantes" (previously Candidate phylum OP8)
• aquifer1
• aquifer2
• "Ca. Berkelbacteria" (previously Candidate phylum ACD58)
• BRC1
• CAB-I
• "Ca. Calescamantes" (previously Candidate phylum EM19)
• Candidate phylum CPR2
• Candidate phylum CPR3
• Candidate phylum NC10
• Candidate phylum OP2
• Candidate phylum RF3
• Candidate phylum SAM
• Candidate phylum SPAM
• Candidate phylum TG2
• Candidate phylum VC2
• Candidate phylum WS1
• Candidate phylum WS2
• Candidate phylum WS4
• Candidate phylum WYO
• CKC4
• "Ca. Cloacimonetes" (previously Candidate phylum WWE1)
• CPR1
• "Ca. Dependentiae" (previously Candidate phylum TM6)
• EM 3
• "Ca. Endomicrobia" Stingl et al. 2005
• "Ca. Fermentibacteria" (Hyd24-12)
• "Ca. Fervidibacteria" (previously Candidate phylum OctSpa1-106)
• GAL08
• GAL15
• GN01
• GN03
• GN04
• GN05
• GN06
• GN07
• GN08
• GN09
• GN10
• GN11
• GN12
• GN13
• GN14
• GN15
• GOUTA4
• "Ca. Gracilibacteria" (previously Candidate phylum GN02, BD1-5, or BD1-5 group)
• Guaymas1
• "Ca. Hydrogenedentes" (previously Candidate phylum NKB19)
• JL-ETNP-Z39
• "Ca. Katanobacteria" (previously Candidate phylum WWE3)
• Kazan-3B-09
• KD3-62
• kpj58rc
• KSA1
• KSA2
• KSB1
• KSB2
• KSB4
• "Ca. Latescibacteria" (previously Candidate phylum WS3)
• LCP-89
• LD1-PA38
• "Ca. Marinamargulisbacteria" (previously Candidate division ZB3)
• "Ca. Marinimicrobia" (previously Marine Group A or Candidate phylum SAR406)
• "Ca. Melainabacteria"
• "Ca. Microgenomates" (previously Candidate phylum OP11)
• "Ca. Modulibacteria" (previously Candidate phylum KSB3)
• MSBL2
• MSBL3
• MSBL4
• MSBL5
• MSBL6
• NPL-UPA2
• NT-B4
• OC31
• "Ca. Omnitrophica" (previously Candidate phylum OP3)
• OP4
• OP6
• OP7
• OS-K/OS-K group
• "Ca. Parcubacteria" (previously Candidate phylum OD1)
• PAUC34f
• "Ca. Peregrinibacteria" (previously Candidate phylum PER)
• "Ca. Poribacteria"
• RsaHF231
• S2R-29
• "Ca. Saccharibacteria" (previously Candidate phylum TM7)
• SBR1093
• SBYG-2791
• Candidate phylum SC3
• Candidate phylum SC4
• Sediment-1
• Sediment-2
• Sediment-3
• Sediment-4
• SHA-109
• SM2F11
• TA06
• "Ca. Tectomicrobia"
• TG3 ("Ca. Chitinivibrionia")
• WCHB1-60
• WD272
• WOR-1
• WOR-3
• WPS-1
• WPS-2
• WS5
• WS6
• ZB2 aka OD1-ZB2 subgroup of OD1 ("Ca. Parcubacteria")
• "Ca. Zixibacteria"

Classes

• "Ca. Lambdaproteobacteria" <small>Anantharaman et al. 2016</small>
• "Ca. Muproteobacteria" <small>Anantharaman et al. 2016</small>
• "Ca. Uabimicrobiia" <small>Lodha et al. 2021</small>
• "Ca. Zetaproteobacteria" <small>Emerson et al. 2007</small>

Orders

• "Ca. Nitrosopumilales" <small>Könneke et al. 2005</small>
• "Ca. Uabimicrobiales" <small>Lodha et al. 2021</small>

Families

• "Ca. Midichloriaceae" <small>Montagna et al. 2013</small>
• "Ca. Nitrosopumilaceae" <small>Könneke et al. 2005</small>
• "Ca. Procabacteriaceae"
• "Ca. Rhabdochlamydiaceae"
• "Ca. Uabimicrobiceae" <small>Lodha et al. 2021</small>

Genera

• "Ca. Accumulibacter" <small>Hesselmann et al. 1999</small>
• "Ca. Allobeggiatoa" <small>Hinck et al. 2011</small>
• "Ca. Arthromitus" <small>Snel et al. 1995</small>
• "Ca. Bacilloplasma" <small>KostanjÅ¡ek et al. 2007</small>
• "Ca. Baumannia" <small>Moran et al. 2003</small>
• "Ca. Blochmannia" <small>Sauer et al. 2000</small>
• "Ca. Carsonella" <small>Thao et al. 2000</small>
• "Ca. Chlorothrix" <small>Klappenbach and Pierson 2004</small>
• "Ca. Competibacter" <small>Crocetti et al. 2002</small>
• "Ca. Contubernalis" <small>Zhilina et al. 2005</small>
• "Ca. Desulforudis"
• "Ca. Endomicrobium" <small>Stingl et al. 2005</small>
• "Ca. Epixenosoma"
• "Ca. Giganthauma"
• "Ca. Glomeribacter" <small>Bianciotto et al. 2003</small>
• "Ca. Kleidoceria" <small>Kuechler et al. 2010</small>
• "Ca. Kuenenia" <small>Schmid et al. 2000</small>
• "Ca. Liberibacter"
• "Ca. Lokiarchaeum"
• "Ca. Lumbricincola" <small>Nechitaylo et al. 2009</small>
• "Ca. Magnetobacterium" <small>Murray and Stackebrandt 1995</small>
• "Ca. Methanoregula"
• "Ca. Microthrix"
• "Ca. Nardonella" <small>Lefèvre et al. 2004</small>
• "Ca. Nitrosoarchaeum" <small>Blainey et al. 2011</small>
• "Ca. Nitrosopumilus" <small>Könneke et al. 2005</small>
• "Ca. Pelagibacter" <small>Rappe et al. 2002</small>
• "Ca. Photodesmus" <small>Hendry and Dunlap 2011</small>
• "Ca. Phytoplasma" <small>Firrao et al. 2004</small>
• "Ca. Portiera" <small>Thao and Baumann 2004</small>
• "Ca. Procabacter" <small>Horn et al. 2002</small>
• "Ca. Rhabdochlamydia"
• "Ca. Riegeria" <small>Gruber-Vodicka et al. 2011</small>
• "Ca. Rohrkolberia" <small>Kuechler et al. 2011</small>
• "Ca. Salinibacter" <small>Antón et al. 2000</small>
• "Ca. Savagella" <small>Thompson et al. 2012</small>
• "Ca. Scalindua"
• "Ca. Similichlamydia" <small>Stride et al. 2013</small>
• "Ca. Symbiothrix" <small>Hongoh et al. 2007</small>
• "Ca. Tremblaya" <small>Thao et al. 2002</small>
• "Ca. Uabimicrobium" <small>Shiratori et al. 2019</small>
• "Ca. Xiphinematobacter" <small>Vandekerckhove et al. 2000</small>

Species and subspecies

Unless otherwise noted (♦), these entries are from LPSN.

• "Ca. Acaryochloris bahamiensis" <small>López-Legentil et al. 2011</small>
• "Ca. Acidianus copahuensis" <small>Giaveno et al. 2013</small>
• "Ca. Aciduliprofundum boonei" <small>Schouten et al. 2008</small>

• "Ca. Accumulibacter phosphatis" <small>Hesselmann et al. 1999</small>
• "Ca. Actinobaculum timonae" <small>Drancourt et al. 2004</small>
• "Ca. Adiaceo aphidicola" <small>Darby et al. 2005</small>
• "Ca. Allobeggiatoa salina" <small>Hinck et al. 2011</small>
• "Ca. Alysiomicrobium bavaricum" <small>Kragelund et al. 2006</small>
• "Ca. Alysiosphaera europaea" <small>Kragelund et al. 2006</small>
• "Ca. Amoebinatus massiliae" <small>Greub et al. 2004</small>
• "Ca. Amoebophilus asiaticus" <small>Horn et al. 2001</small>
• "Ca. Amphibiichlamydia ranarum" <small>Martel et al. 2013</small>
• "Ca. Anadelfobacter veles" <small>Vannini et al. 2010</small>
• "Ca. Ancillula trichonymphae" <small>Strassert et al. 2012</small>
• "Ca. Anammoxoglobus propionicus" <small>Kartal et al. 2007</small>
• "Ca. Anaplasma sparouinense" <small>Duron et al. 2022</small>
• "Ca. Aquiluna rubra" <small>Hahn 2009</small>
• "Ca. Aquirestis calciphila" <small>Hahn and Schauer 2007</small>
• "Ca. Arcobacter sulfidicus" <small>Wirsen et al. 2002</small>
• "Ca. Arsenophonus arthropodicus" <small>Dale et al. 2002</small>
• "Ca. Arsenophonus phytopathogenicus" <small>Bressan et al. 2012</small>
• "Ca. Arsenophonus triatominarum" <small>Hypsa and Dale 1997</small>
• "Ca. Aschnera chinzeii" <small>Hosokawa et al. 2012</small>
• "Ca. Atelocyanobacterium thalassa(♦)
• "Ca. Azoamicus ciliaticola" <small>Graf et al. 2021</small>
• "Ca. Bacteroides massiliae" <small>Drancourt et al. 2004</small>
• "Ca. Bartonella ancashi" <small>Blazes et al. 2013</small>
• "Ca. Bartonella antechini" <small>Kaewmongkol et al. 2011</small>
• "Ca. Bartonella breitschwerdtii(♦)
• "Ca. Bartonella bandicootii" <small>Kaewmongkol et al. 2011</small>
• "Ca. Bartonella durdenii(♦)
• "Ca. Bartonella eldjazairii(♦)
• "Ca. Bartonella mayotimonensis" <small>Lin et al. 2010</small>
• "Ca. Bartonella melophagi(♦)
• "Ca. Bartonella merieuxii" <small>Chomel et al. 2012</small>
• "Ca. Bartonella monaxi(♦)
• "Ca. Bartonella rudakovii(♦)
• "Ca. Bartonella thailandensis" <small>Saisongkorh et al. 2009</small>
• "Ca. Bartonella volans(♦)
• "Ca. Bartonella woyliei" <small>Kaewmongkol et al. 2011</small>
• "Ca. Baumannia cicadellinicola" <small>Moran et al. 2003</small>
• "Ca. Benitsuchiphilus tojoi" <small>Hosokawa et al. 2010</small>
• "Ca. Berkiella aquae" <small>Mehari et al. 2016</small>
• "Ca. Berkiella cookevillensis" <small>Mehari et al. 2016</small>
• "Ca. Blochmannia floridanus" <small>Sauer et al. 2000</small>
• "Ca. Blochmannia herculeanus" <small>Sauer et al. 2000</small>
• "Ca. Blochmannia rufipes" <small>Sauer et al. 2000</small>
• "Ca. Borrelia tachyglossi" <small>Loh et al. 2017</small>
• "Ca. Borrelia texasensis" <small>Lin et al. 2005</small>
• "Ca. Branchiomonas cysticola" <small>Toenshoff et al. 2012</small>
• "Ca. Brocadia anammoxidans" <small>Jetten et al. 2001</small>
• "Ca. Brocadia caroliniensis" <small>Magrí et al. 2012</small>
• "Ca. Brocadia fulgida" <small>Kartal et al. 2004</small>
• "Ca. Brocadia sinica" <small>Hu et al. 2010</small>
• "Ca. Brownia rhizoecola" <small>Gruwell et al. 2010</small>
• "Ca. Burkholderia andongensis" <small>Lemaire et al. 2011</small>
• "Ca. Burkholderia calva" <small>Van Oevelen et al. 2004</small>
• "Ca. Burkholderia crenata(♦)
• "Ca. Burkholderia hispidae" <small>Lemaire et al. 2012</small>
• "Ca. Burkholderia kirkii" <small>Van Oevelen et al. 2002</small>
• "Ca. Burkholderia mamillata(♦)
• "Ca. Burkholderia nigropunctata" <small>Van Oevelen et al. 2004</small>
• "Ca. Burkholderia petitii" <small>Lemaire et al. 2011</small>
• "Ca. Burkholderia rigidae" <small>Lemaire et al. 2012</small>
• "Ca. Burkholderia schumannianae" <small>Lemaire et al. 2012</small>
• "Ca. Burkholderia verschuerenii(♦)
• "Ca. Burkholderia virens(♦)
• "Ca. Caedibacter acanthamoebae" <small>Horn et al. 1999</small>
• "Ca. Caldiarchaeum subterraneum" <small>Nunoura et al. 2011</small>
• "Ca. Campylobacter hominis" <small>Lawson et al. 1998</small>
• "Ca. Captivus acidiprotistae" <small>Baker et al. 2003</small>
• "Ca. Cardinium hertigii" <small>Zchori-Fein et al. 2004</small>
• "Ca. Carsonella ruddii" <small>Thao et al. 2000</small>
• "Ca. Chloracidobacterium thermophilum" <small>Bryant et al. 2007</small>
• "Ca. Chlorothrix halophila" <small>Klappenbach and Pierson 2004</small>
• "Ca. Chryseobacterium massiliae" <small>Greub et al. 2004</small>
• "Ca. Chryseobacterium timonae" <small>Drancourt et al. 2004</small>
• "Ca. Clavochlamydia salmonicola" <small>Karlsen et al. 2008</small>
• "Ca. Cloacamonas acidaminovorans" <small>Pelletier et al. 2008</small>
• "Ca. comitans" <small>Jacobi et al. 1996</small>
• "Ca. Competibacter phosphatis" <small>Crocetti et al. 2002</small>
• "Ca. Consessoris aphidicola" <small>Darby et al. 2005</small>
• "Ca. Contubernalis alkalaceticum" <small>Zhilina et al. 2005</small>
• "Ca. Cryptoprodotis polytropus" <small>Ferrantini et al. 2009</small>
• "Ca. Curculioniphilus buchneri" <small>Toju et al. 2009</small>
• "Ca. Cyrtobacter comes" <small>Vannini et al. 2010</small>
• "Ca. Cyrtobacter zanobii" <small>Boscaro et al. 2013</small>
• "Ca. Defluviella procrastinata" <small>Boscaro et al. 2013</small>
• "Ca. Desulforudis audaxviator" <small>Chivian et al. 2008</small>
• "Ca. Desulfovibrio trichonymphae" <small>Sato et al. 2009</small>
• "Ca. Devosia euplotis" <small>Vannini et al. 2004</small>
• "Ca. Ecksteinia adelgidicola" <small>Toenshoff et al. 2012</small>
• "Ca. Ehrlichia walkerii" <small>Brouqui et al. 2003</small>
• "Ca. Endobugula glebosa" <small>Lim and Haygood 2004</small>
• "Ca. Endobugula sertula" <small>Haygood and Davidson 1997</small>
• "Ca. Endolissoclinum faulkneri" <small>Kwan et al. 2012</small>
• "Ca. Endoecteinascidia frumentensis" <small>Pérez-Matos et al. 2007</small>
• "Ca. Endomicrobium pyrsonymphae" <small>Stingl et al. 2005</small>
• "Ca. Endomicrobium trichonymphae" <small>Stingl et al. 2005</small>
• "Ca. Endonucleobacter bathymodioli" <small>Zielinski et al. 2009</small>
• "Ca. Endoriftia persephone" <small>Robidart et al. 2008</small>
• "Ca. Endowatersipora palomitas" <small>Anderson and Haygood 2007</small>
• "Ca. Endowatersipora rubus" <small>Anderson and Haygood 2007</small>
• "Ca. Entotheonella palauensis" <small>Schmidt et al. 2000</small>
• "Ca. Epiflobacter spp." <small>Xia et al. 2008</small>
• "Ca. Erwinia dacicola" <small>Capuzzo et al. 2005</small>
• "Ca. Evansia muelleri" <small>Kuechler et al. 2013</small>
• "Ca. Flaviluna lacus" <small>Hahn 2009</small>
• "Ca. Fodinabacter communificans" <small>Bertin et al. 2011</small>
• "Ca. Francisella noatunensis subsp. endociliophora" <small>Schrallhammer et al. 2011</small>
• "Ca. Frankia datiscae" <small>Persson et al. 2011</small>
• "Ca. Fritschea bemisiae" <small>Everett et al. 2005</small>
• "Ca. Fritschea eriococci" <small>Everett et al. 2005</small>
• "Ca. Gillettellia cooleyia" <small>Toenshoff et al. 2012</small>
• "Ca. Gilliamella apicola" <small>Martinson et al. 2012</small>
• "Ca. Glomeribacter gigasporarum" <small>Bianciotto et al. 2003</small>
• "Ca. Gortzia infectiva" <small>Boscaro et al. 2012</small>
• "Ca. Haliscomenobacter calcifugiens" <small>Hahn and Schauer 2007</small>
• "Ca. Halomonas phosphatis" <small>Nguyen et al. 2012</small>
• "Ca. Hamiltonella defensa" <small>Moran et al. 2005</small>
• "Ca. Helicobacter bovis" <small>De Groote et al. 1999</small>
• "Ca. Helicobacter heilmannii" <small>O'Rourke et al. 2004</small>
• "Ca. Helicobacter suis" <small>De Groote et al. </small> (includes strains previously known as Helicobacter heilmannii type one)
• "Ca. Heliomonas lunata" <small>Asao et al. 2012</small>
• "Ca. Hemipteriphilus asiaticus" <small>Bing et al. 2013</small>
• "Ca. Hemobacterium ranarum" <small>Zhang and Rikihisa 2004</small> (previously known as Aegyptianella ranarum)
• "Ca. Hepatincola porcellionum" <small>Wang et al. 2004</small>
• "Ca. Hepatobacter penaei" <small>Numan et al. 2013</small>
• "Ca. Hepatoplasma crinochetorum" <small>Wang et al. 2004</small>
• "Ca. Hodgkinia cicadicola" <small>McCutcheon et al. 2009</small>
• "Ca. Holdemania massiliensis(♦)
• "Ca. Ishikawaella capsulata" <small>Hosokawa et al. 2006</small>
• "Ca. Isobeggiatoa divolgata" <small>Salman et al. 2011</small>
• "Ca. Jettenia asiatica" <small>Quan et al. 2008</small>
• "Ca. Kinetoplastibacterium blastocrithidii" <small>Du et al. 1994</small>
• "Ca. Kinetoplastibacterium crithidii" <small>Du et al. 1994</small>
• "Ca. Kleidoceria schneideri" <small>Kuechler et al. 2010</small>
• "Ca. Kopriimonas aquarianus" <small>Quinn et al. 2012</small>
• "Ca. Korarchaeum cryptofilum" <small>Elkins et al. 2008</small>
• "Ca. Koribacter versatilis" <small>Ward et al. 2009</small>
• "Ca. Kuenenia stuttgartiensis" <small>Schmid et al. 2000</small>
• "Ca. Lariskella arthropodarum" <small>Matsuura et al. 2012</small>
• "Ca. Legionella jeonii" <small>Park et al. 2004</small>
• "Ca. Liberibacter americanus" <small>Teixeira et al. 2005</small> - one cause of Citrus greening disease
• "Ca. Liberibacter africanus" <small>Roberts et al. 2015</small> - one cause of Citrus greening disease
• "Ca. Liberibacter africanus" <small>corrig. Jagoueix et al. 1994</small> (previously "Ca. Liberobacter africanum)
• "Ca. Liberibacter africanus subsp. capensis" <small>Garnier et al. 2000</small>
• "Ca. Liberibacter asiaticus" <small>corrig. Jagoueix et al. 1994</small> (previously "Ca. Liberobacter asiaticum) - one cause of Citrus greening disease
• "Ca. Liberibacter europaeus" <small>Raddadi et al. 2011</small>
• "Ca. Liberibacter psyllaurous" <small>Hansen et al. 2008</small>
• "Ca. Liberibacter solanacearum" <small>Liefting et al. 2009</small> - cause of Psyllid yellows and Zebra chip
• "Ca. Limnoluna rubra" <small>Hahn 2009</small>
• "Ca. Macropleicola appendiculatae" <small>Kölsch et al. 2009</small>
• "Ca. Macropleicola muticae" <small>Kölsch et al. 2009</small>
• "Ca. Magnetobacterium bavaricum" <small>Spring et al. 1993</small>
• "Ca. Magnetoglobus multicellularis" <small>Abreu et al. 2007</small>
• "Ca. Magnospira bakii" <small>Snaidr et al. 1999</small>
• "Ca. Maribeggiatoa vulgaris" <small>Salman et al. 2011</small>
• "Ca. Marispirochaeta associata" <small>Shivani et al. 2016</small>
• "Ca. Marithioploca araucae" <small>Salman et al</small>
• "Ca. Marithrix sessilis" <small>Salman et al. 2011</small>
• "Ca. Mesochlamydia elodeae" <small>Corsaro et al. 2013</small>
• "Ca. Metachlamydia lacustris" <small>Corsaro et al. 2010</small>
• "Ca. Methanogranum caenicola" <small>Iino et al. 2013</small>
• "Ca. Methanomethylophilus alvus" <small>Borrel et al. 2012</small>
• "Ca. Methanoregula boonei" <small>Bräuer et al. 2006</small>
• "Ca. Methylacidiphilum infernorum" <small>Hou et al. 2008</small>
• "Ca. Methylomirabilis oxyfera" <small>Ettwig et al. 2010</small>
• "Ca. Micrarchaeum acidiphilum(♦)
• "Ca. Microthrix calida" <small>Levantesi et al. 2006</small>
• "Ca. Microthrix parvicella" <small>Blackall et al. 1996</small>
• "Ca. Midichloria mitochondrii" <small>Sassera et al. 2006</small>
• "Ca. Monilibacter batavus" <small>Kragelund et al. 2006</small>
• "Ca. Moranella endobia" <small>McCutcheon and von Dohlen 2011</small>
• "Ca. Mycoplasma aoti" <small>Barker et al. 2011</small>
• "Ca. Mycoplasma corallicola" <small>Neulinger et al. 2009</small>
• "Ca. Mycoplasma haematoparvum" <small>Sykes et al. 2005</small>
• "Ca. Mycoplasma haemobos" <small>Tagawa et al. 2008</small>
• "Ca. Mycoplasma haemodidelphidis" <small>Messick et al. 2002</small>
• "Ca. Mycoplasma haemofelis" <small>Neimark et al. 2001</small> (synonymous with Haemobartonella felis)
• "Ca. Mycoplasma haemolamae" <small>Messick et al. 2002</small>
• "Ca. Mycoplasma haemomacaque" <small>Maggi et al. 2013</small>
• "Ca. Mycoplasma haemominutum" <small>Foley and Pedersen 2001</small> (previously "Haemobartonella felis small form (Hfsm)")
• "Ca. Mycoplasma haemomuris" <small>Neimark et al. 2001</small> (synonymous with Haemobartonella muris)
• "Ca. Mycoplasma haemomuris subsp. musculi" <small>Harasawa et al. 2015</small>
• "Ca. Mycoplasma haemomuris subsp. ratti" <small>Harasawa et al. 2015</small>
• "Ca. Mycoplasma haemosuis" <small>Neimark et al. 2001</small> (synonymous with Eperythrozoon suis and Mycoplasma suis)
• "Ca. Mycoplasma haemovis" <small>Hornok et al. 2009</small>
• "Ca. Mycoplasma haemozalophi" <small>Volokhov et al. 2011</small>
• "Ca. Mycoplasma kahanei" <small>Neimark et al. 2002</small>
• "Ca. Mycoplasma ravipulmonis" <small>Neimark et al. 1998</small>
• "Ca. Mycoplasma turicensis" <small>Willi et al. 2006</small>
• "Ca. Mycoplasma wenyonii" <small>Neimark et al. 2001</small> (synonymous with Eperythrozoon wenyonii)
• "Ca. Nebulobacter yamunensis" <small>Boscaro et al. 2012</small>
• "Ca. Neoehrlichia arcana" <small>Gofton et al. 2016</small>
• "Ca. Neoehrlichia australis" <small>Gofton et al. 2016</small>
• "Ca. Neoehrlichia lotoris" <small>Yabsley et al. 2008</small>
• "Ca. Neoehrlichia mikurensis" <small>Kawahara et al. 2004</small>
• "Ca. Nitrosoarchaeum koreensis" <small>Kim et al. 2011</small>
• "Ca. Nitrosoarchaeum limnia" <small>Blainey et al. 2011</small>
• "Ca. Nitrosocaldus yellowstonii" <small>de la Torre et al. 2008</small>
• "Ca. Nitrosopelagicus brevis(♦)
• "Ca. Nitrosopumilus koreensis" <small>Park et al. 2012</small>
• "Ca. Nitrosopumilus maritimus" <small>Könneke et al. 2005</small>
• "Ca. Nitrosopumilus salaria" <small>Mosier et al. 2012</small>
• "Ca. Nitrosopumilus sediminis" <small>Park et al. 2012</small>
• "Ca. Nitrososphaera gargensis" <small>Hatzenpichler et al. 2008</small>
• "Ca. Nitrososphaera viennensis" <small>Tourna et al. 2011</small>
• "Ca. Nitrospira bockiana" <small>Lebedeva et al. 2008</small>
• "Ca. Nitrospira defluvii" <small>Spieck et al. 2006</small>
• "Ca. Nitrosotalea devanaterra" <small>Lehtovirta-morley et al. 2011</small>
• "Ca. Nitrotoga arctica" <small>Alawi et al. 2007</small>
• "Ca. Nostocoida limicola" <small>Blackall et al. 2000</small> (strains Ben 17, Ben 18, Ben 67, Ben 68 and Ben 74 are now Tetrasphaera jenkinsii, strain Ben 70 is Tetrasphaera vanveenii, and strains Ver 1 and Ver 2 are Tetrasphaera veronensis)
• "Ca. Odyssella thessalonicensis" <small>Birtles et al. 2000</small>
• "Ca. Ovobacter propellens" <small>Fenchel and Thar 2004</small>
• "Ca. Paenicardinium endonii" <small>Noel and Atibalentja 2006</small>
• "Ca. Parabeggiatoa communis" <small>Salman et al. 2011</small>
• "Ca. Paracaedibacter acanthamoebae" <small>Horn et al. 1999</small>
• "Ca. Paracaedibacter symbiosus" <small>Horn et al. 1999</small>
• "Ca. Paraholospora nucleivisitans" <small>Eschbach et al. 2009</small>
• "Ca. Parilichlamydia carangidicola" <small>Stride et al. 2013</small>
• "Ca. Parvarchaeum acidophilus(♦)
• "Ca. Pasteuria aldrichii" <small>Giblin-Davis et al. 2011</small>
• "Ca. Pasteuria usgae" <small>Giblin-Davis et al. 2003</small>
• "Ca. Pelagibacter ubique" <small>Rappe et al. 2002</small>
• "Ca. Peptostreptococcus massiliae" <small>Drancourt et al. 2004</small>
• "Ca. Phlomobacter fragariae" <small>Zreik et al. 1998</small>
• "Ca. Photodesmus katoptron" <small>Hendry and Dunlap 2011</small>
• "Ca. Phytoplasma 16SrII-U" <small>Yang et al. 2016</small>
• "Ca. Phytoplasma allocasuarinae" <small>Marcone et al. 2004</small>
• "Ca. Phytoplasma americanum" <small>Lee et al. 2006</small>
• "Ca. Phytoplasma asteris" <small>Lee et al. 2004</small>
• "Ca. Phytoplasma aurantifolia" <small>Zreik et al. 1995</small>
• "Ca. Phytoplasma australiense" <small>Davis et al. 1997</small>
• "Ca. Phytoplasma balanitae" <small>Win et al. 2013</small>
• "Ca. Phytoplasma brasiliense" <small>Montano et al. 2001</small>
• "Ca. Phytoplasma caricae" <small>Arocha et al. 2005</small>
• "Ca. Phytoplasma castaneae" <small>Jung et al. 2002</small>
• "Ca. Phytoplasma cirsii" <small>Safarova et al. 2016</small>
• "Ca. Phytoplasma convolvuli" <small>Martini et al. 2012</small>
• "Ca. Phytoplasma costaricanum" <small>Lee et al. 2011</small>
• "Ca. Phytoplasma cynodontis" <small>Marcone et al. 2004</small>
• "Ca. Phytoplasma fragariae" <small>Valiunas et al. 2006</small>
• "Ca. Phytoplasma fraxini" <small>Griffiths et al. 1999</small> - cause of Lilac witches'-broom
• "Ca. Phytoplasma graminis" <small>Arocha et al. 2005</small>
• "Ca. Phytoplasma hispanicum" <small>Davis et al. 2016</small>
• "Ca. Phytoplasma japonicum" <small>Sawayanagi et al. 1999</small>
• "Ca. Phytoplasma lycopersici" <small>Arocha et al. 2007</small>
• "Ca. Phytoplasma malaysianum" <small>Nejat et al. 2013</small>
• "Ca. Phytoplasma mali" <small>Seemüller and Schneider 2004</small>
• "Ca. Phytoplasma meliae" <small>Fernandez et al. 2016</small>
• "Ca. Phytoplasma omanense" <small>Al-Saady et al. 2008</small>
• "Ca. Phytoplasma oryzae" <small>Jung et al. 2003</small>
• "Ca. Phytoplasma palmicola" <small>Harrison et al. 2014</small>
• "Ca. Phytoplasma phoenicium" <small>Verdin et al. 2003</small>
• "Ca. Phytoplasma pini" <small>Schneider et al. 2005</small>
• "Ca. Phytoplasma pruni" <small>Davis et al. 2013</small>
• "Ca. Phytoplasma prunorum" <small>Seemüller and Schneider 2004</small>
• "Ca. Phytoplasma pyri" <small>Seemüller and Schneider 2004</small>
• "Ca. Phytoplasma rhamni" <small>Marcone et al. 2004</small>
• "Ca. Phytoplasma rubi" <small>Malembic-Maher et al. 2011</small>
• "Ca. Phytoplasma rubi" <small>Franova et al. 2016</small>
• "Ca. Phytoplasma solani" <small>Quaglino et al. 2013</small>
• "Ca. Phytoplasma spartii" <small>Marcone et al. 2004</small>
• "Ca. Phytoplasma sudamericanum" <small>Davis et al. 2012</small>
• "Ca. Phytoplasma tamaricis" <small>Zhao et al</small>
• "Ca. Phytoplasma trifolii" <small>Hiruki and Wang 2004</small>
• "Ca. Phytoplasma ulmi" <small>Lee et al. 2004</small>
• "Ca. Phytoplasma vitis" <small>Marzorati et al. 2006</small> - cause of Flavescence dorée
• "Ca. Phytoplasma ziziphi" <small>Jung et al. 2003</small>
• "Ca. Piscichlamydia salmonis" <small>Draghi et al. 2004</small>
• "Ca. Planktoluna difficilis" <small>Hahn 2009</small>
• "Ca. Planktomarina temperata" <small>Giebel et al. 2011</small>
• "Ca. Planktophila limnetica" <small>Jezbera et al. 2009</small>
• "Ca. Portiera aleyrodidarum" <small>Thao and Baumann 2004</small>
• "Ca. Prevotella massiliensis" <small>Drancourt et al. 2004</small>
• "Ca. Procabacter acanthamoebae" <small>Horn et al. 2002</small>
• "Ca. Profftia tarda" <small>Toenshoff et al. 2012</small>
• "Ca. Profftia virida" <small>Toenshoff et al. 2012</small>
• "Ca. Protochlamydia amoebophila" <small>Collingro et al. 2005</small>
• "Ca. Puchtella pedicinophila" <small>Fukatsu et al. 2009</small>
• "Ca. Puniceispirillum marinum" <small>Oh et al. 2010</small>
• "Ca. Purcelliella pentastirinorum" <small>Bressan et al. 2009</small>
• "Ca. Regiella insecticola" <small>Moran et al. 2005</small>
• "Ca. Renichlamydia lutjani" <small>Corsaro and Work 2012</small>
• "Ca. Rhabdochlamydia crassificans" <small>Corsaro et al. 2006</small>
• "Ca. Rhabdochlamydia porcellionis" <small>KostanjÅ¡ek</small> (morphology matches the description of Chlamydia isopodii)
• "Ca. Rhizobium massiliae" <small>Greub et al. 2004</small>
• "Ca. Rhodoluna limnophila" <small>Hahn 2009</small>
• "Ca. Rhodoluna planktonica" <small>Hahn 2009</small>
• "Ca. Rickettsia amblyommii" <small>Labruna et al. 2004</small>
• "Ca. Rickettsia andeanae" <small>Jiang et al. 2005</small>
• "Ca. Rickettsia asemboensis" <small>Jiang et al. 2013</small>
• "Ca. Rickettsia barbariae" <small>Mura et al. 2008</small>
• "Ca. Rickettsia hebeiii" <small>Yaxue et al. 2011</small>
• "Ca. Rickettsia hungarica" <small>Hornok et al. 2010</small>
• "Ca. Rickettsia hoogstraalii" <small>Mattila et al. 2007</small>
• "Ca. Rickettsia kellyi" <small>Rolain et al. 2006</small>
• "Ca. Rickettsia kingi" <small>Anstead and Chilton 2013</small>
• "Ca. Rickettsia kotlanii" <small>Sréter-Lancz et al. 2006</small>
• "Ca. Rickettsia liberiensis" <small>Mediannikov et al. 2012</small>
• "Ca. Rickettsia principis" <small>Mediannikov et al. 2006</small>
• "Ca. Rickettsia senegalensis" <small>Mediannikov, Aubadie-Ladrix, and Raoult 2015</small>
• "Ca. Rickettsia tarasevichiae" <small>Shpynov et al. 2003</small>
• "Ca. Rickettsia tasmanensis" <small>Izzard et al. 2009</small>
• "Ca. Rickettsia vini" <small>Palomar et al. 2012</small>
• "Ca. Riegeria galateiae" <small>Gruber-Vodicka et al. 2011</small>
• "Ca. Riesia pediculicola" <small>Sasaki-Fukatsu et al. 2006</small>
• "Ca. Rohrkolberia cinguli" <small>Kuechler et al. 2011</small>
• "Ca. Roseomonas massiliae" <small>Greub et al. 2004</small>
• "Ca. Ruthia magnifica" <small>Newton et al. 2007</small>
• "Ca. Scalindua arabica" <small>Woebken et al. 2008</small>
• "Ca. Scalindua brodae" <small>Schmid et al. 2003</small>
• "Ca. Scalindua pacifica" <small>Dang et al. 2003</small>
• "Ca. Scalindua profunda" <small>Van De Vossenberg et al. 2008</small>
• "Ca. Scalindua richardsii" <small>Fuchsman et al. 2012</small>
• "Ca. Scalindua sorokinii" <small>Kuypers et al. 2003</small>
• "Ca. Scalindua wagneri" <small>Schmid et al. 2003</small>
• "Ca. Serratia symbiotica" <small>Moran et al. 2005</small>
• "Ca. Similichlamydia latridicola" <small>Stride et al. 2013</small>
• "Ca. Snodgrassella alvi" <small>Martinson et al. 2012</small>
• "Ca. Snodgrassella alvi" <small>Martinson et al. 2012</small>
• "Ca. Sodalis melophagi" <small>Chrudimský et al. 2012</small>
• "Ca. Sodalis pierantonius" <small>Oakeson et al. 2014</small>
• "Ca. Sphaeronema italicum" <small>Kragelund et al. 2006</small>
• "Ca. Stammerula tephritidis" <small>Mazzon et al. 2008</small>
• "Ca. Steffania adelgidicola" <small>Toenshoff et al. 2012</small>
• "Ca. Streptomyces philanthi" <small>Kaltenpoth et al. 2006</small>
• "Ca. Sulcia muelleri" <small>Moran et al. 2005</small>
• "Ca. Sulfurovum sediminum" <small>Park et al. 2012</small>
• "Ca. Symbiothrix dinenymphae" <small>Hongoh et al. 2007</small>
• "Ca. Synechococcus spongiarum" <small>Usher et al. 2004</small>
• "Ca. Tammella caduceiae" <small>Hongoh et al. 2007</small>
• "Ca. Tenderia electrophaga" <small>Eddie et al. 2016</small>
• "Ca. Thermochlorobacter aerophilum" <small>Liu et al. 2012</small>
• "Ca. Thiobios zoothamnicoli" <small>Rinke et al. 2006</small>
• "Ca. Thiodictyon syntrophicum" <small>Peduzzi et al. 2012</small>
• "Ca. Thioglobus singularis" <small>Marshall and Morris 2013</small>
• "Ca. Thiomargarita joergensenii" <small>Salman et al. 2011</small>
• "Ca. Thiomargarita nelsonii" <small>Salman et al. 2011</small>
• "Ca. Thiophysa hinzei" <small>Salman et al. 2011</small>
• "Ca. Thiopilula aggregata" <small>Salman et al. 2011</small>
• "Ca. Thioturbo danicus" <small>Muyzer et al. 2005</small>
• "Ca. Tremblaya phenacola" <small>Gruwell et al. 2010</small>
• "Ca. Tremblaya princeps" <small>Thao et al. 2002</small>
• "Ca. Troglogloea absoloni" <small>KostanjÅ¡ek et al. 2013</small>
• "Ca. Uabimicrobium amorphum" <small>Shiratori et al. 2019</small>
• "Ca. Uabimicrobium helgolandensis" <small>Wurzbacher et al. 2024</small>
• "Ca. Uzinura diaspidicola" <small>Gruwell et al. 2007</small>
• "Ca. Vallotia cooleyia" <small>Toenshoff et al. 2012</small>
• "Ca. Vallotia tarda" <small>Toenshoff et al. 2012</small>
• "Ca. Vallotia virida" <small>Toenshoff et al. 2012</small>
• "Ca. Veillonella atypica" <small>Drancourt et al. 2004</small>
• "Ca. Vesicomyosocius okutanii" <small>Kuwahara et al. 2007</small>
• "Ca. Vestibaculum illigatum" <small>Stingl et al. 2004</small>
• "Ca. Vidania fulgoroideae" <small>Gonella et al. 2011</small>
• "Ca. Wolinella africanus" <small>Bohr et al. 2003</small>
• "Ca. Xenohaliotis californiensis" <small>Friedman et al. 2000</small>
• "Ca. Xiphinematobacter americani" <small>Vandekerckhove et al. 2000</small>
• "Ca. Xiphinematobacter brevicolli" <small>Vandekerckhove et al. 2000</small>
• "Ca. Xiphinematobacter rivesi" <small>Vandekerckhove et al. 2000</small>
• "Ca. Zinderia insecticola" <small>McCutcheon and Moran 2010</small>

Former candidatus taxa

• Armatimonadota, formerly Candidate phylum OP10
• Atribacterota (previously Candidate phylum OP9 or JS1)
• Caldisericota, formerly Candidate phylum OP5
• Elusimicrobiota, formerly Termite Group 1
• Ignavibacteriota (previously Candidate phylum ZB1)
• Lentisphaerota, formerly vadinBE97
• Nitrospinota

See also

• Uncultivated bacterial phyla and metagenomics
• Open nomenclature, a system of notations used in taxonomy to indicate a taxonomist's judgement about taxon affinities
• Glossary of scientific naming
• incertae sedis, a taxon of uncertain position in a classification
• nomen dubium, a name of unknown or doubtful application

References