This article lists the genera of the Archaea and also shows taxa of archaea that do not contain genera. The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI) unless otherwise noted.

Phylogeny

For the GTDB 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 the GTDB release 11-RS232 (15th April 2026).

Phylum MicrocaldotaMicrocaldota

Class Microcaldia

Order Microcaldales

Family Microcaldaceae Sakai et al. 2023

• Microcaldus Sakai et al. 2023

Phylum "UndinarchaeotaUndinarchaeota"

Class "Undinarchaeia"

Order "Undinarchaeales"

Family "Naiadarchaeaceae" Dombrowski et al. 2020

• "Candidatus Naiadarchaeum" Dombrowski et al. 2020

Family "Undinarchaeaceae" Dombrowski et al. 2020

• "Candidatus Undinarchaeum" Dombrowski et al. 2020

Phylum "HuberarchaeaotaHuberarchaeaota"

Class "Huberarchaeia"

Order "Huberarchaeales"

Family "Huberarchaeaceae" Rinke et al. 2020

• "Candidatus Huberarchaeum" corrig. Schwank et al. 2019

Phylum "AenigmarchaeotaAenigmatarchaeota"

Class "Aenigmatarchaeia"

Order "Aenigmatarchaeales"

Family "Aenigmatarchaeaceae" corrig. Rinke et al. 2020

• "Candidatus Aenigmatarchaeum" corrig. Rinke et al. 2013

Order PWEA01

Family "Haloaenigmatarchaeaceae" Gutiérrez-Preciado et al. 2024 [PWEA01]

• "Candidatus Haloaenigmatarchaeum" Gutiérrez-Preciado et al. 2024

Phylum "TerrarchaeotaTerrarchaeota"

Class "Terrarchaeia"

Order "Terrarchaeales"

Family "Marinivulcanaceae" Hamm et al. 2026 [WAPT01]

• "Candidatus Marinivulcanus" Hamm et al. 2026 [WAPT01]

Family "Terrarchaeaceae" Hamm et al. 2026 ["Caliditerrarchaeaceae" Hamm et al. 2025; GLR71]

• "Candidatus Terrarchaeum" Hamm et al. 2026 ["Candidatus Caliditerrarchaeum" Hamm et al. 2025; GLR71]

Phylum "NanohaloarchaeotaNanohalarchaeota"

Class "Nanohalarchaeia"

Order "Nanohalarchaeales"

Family "Nanohalarchaeaceae"

• ?"Candidatus Nanohalarchaeum" corrig. Hamm et al. 2019

• ?"Candidatus Nanopetraeus" corrig. Crits‐Christoph et al. 2016

Order "Nanohydrothermales"

Family "Nanohydrothermaceae" Xie et al. 2022

• ?"Candidatus Nanohydrothermus" Xie et al. 2022

Order "Nucleotidisoterales"

Family "Nanosalenecaceae" Xie et al. 2022

• ?"Candidatus Nanosalenecus" Xie et al. 2022

Family "Nucleotidisoteraceae" Xie et al. 2022

• ?"Candidatus Nucleotidisoter" Xie et al. 2022

Family "Nucleotidivindicaceae" Xie et al. 2022

• ?"Nucleotidivindex" Xie et al. 2022

Class "Nanohalobiia"

Order "Nanohalobiales"

Family "Nanohalalkaliarchaeaceae" La Cono et al. 2020

• "Candidatus Nanohalalkaliarchaeum" Ghai et al. 2011

Family "Nanoanaerosalinaceae" Zhao et al. 2022

• "Candidatus Asbonarchaeum" Baker et al. 2024

• "Candidatus Nanoanaerosalina" Zhao et al. 2022

Family "Nanohalobiaceae" La Cono et al. 2020

• ?"Candidatus Haloredivivus" Ghai et al. 2011

• "Candidatus Nanohalobium" La Cono et al. 2020

• "Candidatus Nanohalococcus" Reva et al. 2023

• "Candidatus Nanosalina" Narasingarao et al. 2012

• "Candidatus Nanosalinicola" corrig. Narasingarao et al. 2012

• "Candidatus Nanohalovita" Reva et al. 2023

Phylum NanoarchaeotaNanobdellota

Class Nanobdellia

Order "Pacearchaeales"

Order "Woesearchaeales"

Order Nanobdellales

Family "Nanoarchaeaceae" Huber et al. 2011

• "Nanoarchaeum" Huber et al. 2002

Family Nanobdellaceae Kato et al. 2022 ["Nanopusillaceae" Huber et al. 2011]

• Nanobdella Kato et al. 2022 ["Ca. Nanobsidianus" Castelle et al. 2015; "Ca. Nanopusillus" Wurch et al. 2016]

• "Candidatus Nanoclepta" St. John et al. 2019

Order "Tiddalikarchaeales"

Family "Tiddalikarchaeaceae" Vázquez-Campos et al. 2021

• "Candidatus Tiddalikarchaeum" Vázquez-Campos et al. 2021

Order JAPDLS01

Family "Haiyanarchaeaceae" Rao et al. 2023

• "Candidatus Haiyanarchaeum" Rao et al. 2023 ["Ca. Tinosarcha" Pallen, Rodriguez-R & Alikhan 2022]

Order "Jingweiarchaeales"

Family "Jingweiarchaeaceae" Rao et al. 2023

• "Candidatus Jingweiarchaeum" Rao et al. 2023

Order "Parvarchaeales"

Family "Parvarchaeaceae" Rinke et al. 2020

• "Candidatus Acidifodinimicrobium" Luo et al. 2020

• "Candidatus Parvarchaeum" Baker et al. 2010 (ARMAN 4 & 5)

• "Candidatus Rehaiarchaeum" Rao et al. 2023

Phylum "AltarchaeotaAltarchaeota"

Class "Altarchaeia"

Order "Altarchaeales"

Family "Altarchaeaceae" corrig. Probst et al. 2014

• "Candidatus Altarchaeum" corrig. Probst et al. 2014

Phylum "IainarchaeotaIainarchaeota"

Class "Iainarchaeia"

Order "Forterreales"

Family "Forterreaceae" Pallen, Rodriguez-R & Alikhan 2022 [CSSED10-239]

• "Candidatus Forterrea" Probst & Banfield 2017

Order "Iainarchaeales"

Family "Iainarchaeaceae" Rinke et al. 2020

• "Candidatus Iainarchaeum" Rinke et al. 2013

Phylum "MicrarchaeotaMicrarchaeota"

Class "Micrarchaeia"

Order "Norongarragalinales"

Family "Norongarragalinaceae" Vázquez-Campos et al. 2021

• "Candidatus Norongarragalina" Vázquez-Campos et al. 2021

Order "Micrarchaeales"

Family "Micrarchaeaceae" Vázquez-Campos et al. 2021

• "Candidatus Mancarchaeum" Golyshina et al. 2017

• "Candidatus Micrarchaeum" Baker et al. 2010

Order "Anstonellales"

Family "Anstonellaceae" Vázquez-Campos et al. 2021

• "Candidatus Anstonella" Vázquez-Campos et al. 2021

Family "Bilamarchaeaceae" Vázquez-Campos et al. 2021

• "Candidatus Bilamarchaeum" Vázquez-Campos et al. 2021

Order "Burarchaeales"

Family "Gugararchaeaceae" Vázquez-Campos et al. 2021

• "Candidatus Gugararchaeum" Vázquez-Campos et al. 2021

Family "Burarchaeaceae" Vázquez-Campos et al. 2021

• "Candidatus Burarchaeum" Vázquez-Campos et al. 2021

Family "Fermentimicrarchaeaceae" Kadnikov et al. 2020 (Sv326)

• "Candidatus Fermentimicrarchaeum" Kadnikov et al. 2020

Phylum Promethearchaeota

Taxonomy of this group is based on LPSN, and also these works:

Promethearchaeota incertae sedis

• ?"Friggarchaeota" Caceres 2019

• ?"Gefionarchaeota" Caceres 2019

• ?"Idunnarchaeota" Caceres 2019

• ?"Kexuearchaeota" Cai et al. 2021

• ?"Sleipnirarchaeota" Kioukis et al. 2025

• ?"Candidatus Balderarchaeum" Xie et al. 2022

• ?"Candidatus Ranarchaeum" Appler et al. 2026

• ?"Candidatus Sukunaarchaeum" Harada et al. 2025

• ?"Candidatus Tyrarchaeum" Xie et al. 2022

Class "Asgardarchaeia"

Order "Asgardarchaeales"

Family "Asgardarchaeaceae" Eme et al. 2023 ex Tamarit et al. 2024

• "Candidatus Asgardarchaeum" Eme et al. 2023 ex Tamarit et al. 2024

Class "ThorarchaeiaThorarchaeia"

Order "Thorarchaeales"

• Family "Thorarchaeaceae" (MBG-B)

Class "Atabeyarchaeia"

Order "Atabeyarchaeales"

Family "Atabeyarchaeaceae" Valentin-Alvaradoet al. 2024

• "Candidatus Atabeyarchaeum" Valentin-Alvarado et al. 2024

Class "Baldrarchaeia"

Order "Baldrarchaeales"

Family "Baldrarchaeaceae" corrig. Liu et al. 2021

• "Candidatus Baldrarchaeum" Liu et al. 2021

Class "Jordarchaeia"

Order "Jordarchaeales"

Family "Freyrarchaeaceae" Xie et al. 2022

• "Candidatus Freyrarchaeum" Xie et al. 2022

Family "Jordarchaeaceae" Sun et al. 2021

• "Candidatus Jordarchaeum" Sun et al. 2021 ["Ca. Freyarchaeum" (sic) Valentin-Alvarado et al. 2024]

Class "Odinarchaeia"

Order "Odinarchaeales"

Family "Odinarchaeaceae" Tamarit et al. 2022

• "Candidatus Odinarchaeum" Tamarit et al. 2022

Order "YangjianarchaealesYangjianarchaeales"

Class "Hermodarchaeia"

Order "Hermodarchaeales"

Family "Hermodarchaeaceae" corrig. Liu et al. 2021

• "Candidatus Hermodarchaeum" Liu et al. 2021

Class LokiarchaeiaPromethearchaeia

Order "HelarchaeotaHelarchaeales"

Order PromethearchaeaceaePromethearchaeales

Family "Sigynarchaeaceae" Xie et al. 2022

• "Candidatus Sigynarchaeum" Xie et al. 2022

Family Promethearchaeaceae Imachi et al. 2024

• "Candidatus Harpocratesius" Wu et al. 2022

• "Candidatus Lokiarchaeum" corrig. Spang et al. 2015 (MBGB, DSAG)

• "Candidatus Nerearchaeum" Nobs et al. 2026

• Promethearchaeum Imachi et al. 2024

Class "Borrarchaeia"

Order "Sifarchaeales"

Family "Sifarchaeaceae" Sun et al. 2021

• "Candidatus Sifarchaeum" corrig. Farag, Zhao & Biddle 2020

Order "Borrarchaeales"

Family "Borrarchaeaceae" Liu et al. 2021

• "Candidatus Borrarchaeum" Liu et al. 2021

Class "Wukongarchaeia"

Order "Wukongarchaeales"

Family "Wukongarchaeaceae" Liu et al. 2021

• "Candidatus Wukongarchaeum" Liu et al. 2021

Class "Njordarchaeia"

Order "Njordarchaeales"

Family "Panguiarchaeaceae" Qu et al. 2023

• "Panguiarchaeum" Qu et al. 2023

Family "Njordarchaeaceae" Xie et al. 2022

• "Candidatus Njordarchaeum" Xie et al. 2022

Class "Heimdallarchaeia"

• ?"Candidatus Yibarchaeum" MacLeod et al. 2025

Order "WenzhongarchaealesWenzhongarchaeales"

Order "Hodarchaeales"

Family "Hodarchaeaceae" Liu et al. 2021

• "Candidatus Hodarchaeum" Liu et al. 2021

Family "Margulisarchaeaceae" Imachi et al. 2025

• ?"Candidatus Flexarchaeum" Imachi et al. 2025

• ?"Candidatus Margulisarchaeum" Imachi et al. 2025

Order "GerdarchaealesGerdarchaeales"

Order "Heimdallarchaeales"

Family "Kariarchaeaceae" Liu et al. 2021

• "Candidatus Kariarchaeum" Liu et al. 2021

Family "Heimdallarchaeaceae" Wu et al. 2022

• "Candidatus Heimdallarchaeum" Wu et al. 2022

Phylum "KorarchaeotaKorarchaeota"

Class "Korarchaeia"

Order "Korarchaeales"

Family "Korarchaeaceae" Rinke et al. 2020

• "Candidatus Korarchaeum" Elkins et al. 2008

• "Candidatus Methanodesulfokora" McKay et al. 2019

Phylum ThermoproteotaThermoproteota

Thermoproteota Incertae sedis

"BrockiarchaeotaBrockiarchaeota"

Class CALKCG01

Order "Bifangarchaeales"

Family "Bifangicolaceae" Hou et al. 2023

• ?"Candidatus Bifangicola" Hou et al. 2023 [3300025546_26]

Family "Bifangarchaeaceae" Hou et al. 2023 [B24]

• "Candidatus Bifangarchaeum" corrig. Hou et al. 2023 [DTBU01 sp011374155]

Family "Bifangistellaceae" Hou et al. 2023 [DRYS01]

• "Candidatus Bifangistella" Hou et al. 2023 [DRYS01 sp011367275]

Class "BathyarchaeiaBathyarchaeia"

Order "Xuanwuarculales"

Family "Mazuisomaceae" Hou et al. 2023

• ?"Candidatus Mazuisoma" Hou et al. 2023

Family "Mazuicellaceae" Hou et al. 2023

• ?"Candidatus Mazuibellus" Hou et al. 2023

• ?"Candidatus Mazuicella" Hou et al. 2023

Family "Mazuousiaecae" Hou et al. 2023

• ?"Candidatus Mazuarcula" Hou et al. 2023

• ?"Candidatus Mazuousia" Hou et al. 2023

Family "Xuanwuarculaceae" Hou et al. 2023

• "Candidatus Xuanwuarcula" Hou et al. 2023 [RBG-16-48-13 sp001775995]

Order "Hecatellales"

Family "Hecatellaceae" Rinke et al. 2020 ["Jinwuarculaceae" Hou et al. 2023; "Jinwuicolaceae" Hou et al. 2023; "Jinwuimonadaceae" Hou et al. 2023; "Jinwuiprofundaceae" Hou et al. 2023; "Jinwuousiaceae" Hou et al. 2023]

• "Candidatus Hecatella" Adam et al. 2022

• "Candidatus Jinwuarcula" Hou et al. 2023 [B25]

• "Candidatus Jinwuicola" Hou et al. 2023 [EX4484-218 sp002254975]

• ?"Candidatus Jinwuimonas" Hou et al. 2023

• "Candidatus Jinwuimorpha" Hou et al. 2023 [EX4484-218 sp003661965]

• ?"Candidatus Jinwuiprofundus" Hou et al. 2023

• ?"Candidatus Jinwuousia" Hou et al. 2023 [JdFR-11 sp002011035]

Order "Houtuarculales"

Family "Houtuithermaceae" Hou et al. 2023

• ?"Candidatus Houtuithermus" Hou et al. 2023

Family "Marihoutuimonadaceae" Hou et al. 2023

• ?"Candidatus Houtuibellus" Hou et al. 2023

• ?"Candidatus Marihoutuimonas" Hou et al. 2023

Family "Crenohoutuithermaceae" Hou et al. 2023

• "Candidatus Crenohoutuithermus" Hou et al. 2023 [DTDX01]

Family "Fontihoutuithermaceae" Hou et al. 2023 ["Fluxihoutuithermaceae" Hou et al. 2023; DTGE01]

• ?"Candidatus Fluxihoutuithermus" Hou et al. 2023 [DTOY01 sp011358085]

• "Candidatus Fontihoutuithermus" Hou et al. 2023 [DTGE01 sp011389385]

Family "Aphrohoutuibellaceae" Hou et al. 2023 [RBG-13-38-9]

• "Candidatus Aphrohoutuibellus" Hou et al. 2023 [RBG-13-38-9]

• "Candidatus Hydrohoutuibellus" Hou et al. 2023 [DTMT01 sp011355205]

Family "Houtuousiaceae" Hou et al. 2023 ["Houtuarculaceae" Hou et al. 2023; "Limnohoutuiplasmataceae" corrig. Hou et al. 2023; 40CM-2-53-6]

• "Candidatus Houtuousia" Hou et al. 2023 [40CM-2-53-6]

• "Candidatus Houtuarcula" Hou et al. 2023 [FEN-987]

• ?"Candidatus Limnohoutuiplasma" Hou et al. 2023

Order "Wuzhiqiibiales"

Family "Wuzhiqiithermaceae" Hou et al. 2023

• ?"Candidatus Wuzhiqiithermus" Hou et al. 2023

Family "Wuzhiqiitorraceae" Hou et al. 2023

• ?"Candidatus Wuzhiqiitorris" Hou et al. 2023

Family "Wuzhiqiimorphaceae" Hou et al. 2023 [PIYN01]

• "Candidatus Wuzhiqiimorpha" Hou et al. 2023 [PIYN01 sp003601775]

Family "Wuzhiqiimonadaceae" Hou et al. 2023 [B23]

• "Candidatus Wuzhiqiimonas" Hou et al. 2023 [B23]

Family "Wuzhiqiibiaceae" Hou et al. 2023

• "Candidatus Wuzhiqiibium" Hou et al. 2023 [TCS64]

Order "Zhuquarculales"

Family "Zhuquarculaceae" Hou et al. 2023

• "Candidatus Zhuquarcula" Hou et al. 2023 [EX4484-135]

Family "Zhuquomorphaceae" Hou et al. 2023 [B24-G1]

• "Candidatus Zhuquomorpha" Hou et al. 2023

Order "Bathyarchaeales"

Family "Actozhurongousiaceae" Hou et al. 2023

• ?"Candidatus Actozhurongousia" Hou et al. 2023

Family "Yuguousiaceae" Hou et al. 2023

• ?"Candidatus Yuguousia" Hou et al. 2023

Family "Pontizhurongicolaceae" Hou et al. 2023

• "Candidatus Pontizhurongicola" Hou et al. 2023 [B24-2 sp002490245]

Family "Hanbarchaeaceae" Hou et al. 2023 ["Zhurongicellaceae" Hou et al. 2023; DTEX01]

• "Candidatus Fufeiimorpha" Hou et al. 2023 [PIYB01]

• "Candidatus Hanbarchaeum" Hou et al. 2023 [DTEX01]

• "Candidatus Zhurongicella" Hou et al. 2023 [B63]

Family "Marizhurongicellaceae" Hou et al. 2023 [B26-1]

• ?"Candidatus Aoguangisoma" Hou et al. 2023

• "Candidatus Marizhurongibium" Hou et al. 2023 [B17-G17 sp003662645]

• "Candidatus Marizhurongicella" Hou et al. 2023 [B26-1]

• ?"Candidatus Yanziimonas" Hou et al. 2023

• ?"Candidatus Zhurongibium" Hou et al. 2023

Family "Hanbopyraceae" Hou et al. 2023

• "Candidatus Hanbopyrus" Hou et al. 2023 [WUQV01 sp009889585]

Family "Jingweiiplasmataceae" Hou et al. 2023 [SOJC01]

• "Candidatus Jingweiiplasma" Hou et al. 2023 [SOJC01]

Family "Bathyarchaeaceae" Khomyakova et al. 2023 ["Baizosomaceae" Hou et al. 2023; "Baizostellaceae" Hou et al. 2023; "Halozhurongicellaceae" Hou et al. 2023]

• "Candidatus Baizobellus" Hou et al. 2023 [SOJZ01]

• ?"Candidatus Baizosediminiarchaeum" Yu et al. 2023 [BIN-L-1]

• "Candidatus Baizosoma" Hou et al. 2023 [BA1 sp001399805]

• ?"Candidatus Baizostella" Hou et al. 2023

• "Candidatus Bathyarchaeum" Khomyakova et al. 2023

• "Candidatus Halozhurongicella" Hou et al. 2023 [B1-G15]

Family "Baizomorphaceae" Hou et al. 2023 [UBA233]

• "Candidatus Baizomorpha" Hou et al. 2023

Family "Bathycorpusculaceae" Loh & Brune 2023 ["Aoshunithermaceae" Hou et al. 2023; "Baizomonadaceae" Hou et al. 2023; "Buyanhuyuicellaceae" Hou et al. 2023; "Hanbothermaceae" Hou et al. 2023; "Yanziithermaceae" Hou et al. 2023; "Yuguotorraceae" corrig. Hou et al. 2023]

• ?"Candidatus Aoshunithermus" Hou et al. 2023

• ?"Candidatus Baizomonas" Hou et al. 2023

• "Candidatus Bathycorpusculum" Loh & Brune 2023 ["Ca. Hafrusarcha" Pallen, Rodriguez-R & Alikhan 2022]

• "Candidatus Buyanhuyuicella" Hou et al. 2023 [SOJA01]

• "Candidatus Buyanhuyuitorris" Hou et al. 2023 [PIYA01]

• "Candidatus Hanbocola" Hou et al. 2023 [DSZD01]

• "Candidatus Hanbothermus" Hou et al. 2023 [DRVP01]

• "Candidatus Yanziithermus" Hou et al. 2023 [JdFR-07]

• "Candidatus Yuguotorris" Hou et al. 2023 [DSLH01]

Class NitrososphaerotaNitrososphaeria_A

Order "Caldarchaeales"

Family "Calditenuaceae" Balbay et al. 2023

• "Candidatus Calditenuis" Beam et al. 2016

Family "Caldarchaeaceae" Rinke et al. 2020

• "Candidatus Caldarchaeum" corrig. Nunoura et al. 2011

• "Candidatus Pelearchaeum" Balbay et al. 2023 ["Ca. Cadrafarcha" Pallen, Rodriguez-R & Alikhan 2022]

Family "Wolframiiraptoraceae" Buessecker et al. 2022

• "Candidatus Benthortus" Buessecker et al. 2022

• "Candidatus Geocrenenecus" Buessecker et al. 2022

• "Candidatus Terraquivivens" Buessecker et al. 2022

• "Candidatus Wolframiiraptor" Buessecker et al. 2022

Class NitrososphaerotaNitrososphaeria

Nitrososphaeria incertae sedis

• ?"Candidatus Cenoporarchaeum" corrig. Zhang et al. 2019

• ?"Candidatus Gigantothauma" corrig. Muller et al. 2010

• ?"Candidatus Nitrosodeserticola" Hwang et al. 2021

Order "Geothermarchaeales"

Family "Geothermarchaeaceae" Adam et al. 2022

• "Candidatus Geothermarchaeum" Adam et al. 2022

• "Candidatus Scotarchaeum" Adam et al. 2022

Order PSMU01

Family PSMU01

• "Candidatus Australarchaeum" Herbold et al. 2024

Order Conexivisphaerales

Family Conexivisphaeraceae Kato et al. 2021 (THSC Group)

• Conexivisphaera Kato et al. 2021

Family "Thermosulfuridaceae" Chang et al. 2026

• "Acidarchaeum" Chang et al. 2026 [JAJZYL01]

• ?"Thermosulfuris" Chang et al. 2026

Order NitrososphaeralesNitrososphaerales

Family "Methylarchaceae" Hua et al. 2019

• ?"Candidatus Methylarchaeum" Hua et al. 2019

• ?"Candidatus Methanotowutia" Ou et al. 2022

Family "Gagatemarchaeaceae" Sheridan et al. 2023 [UBA183]

• "Candidatus Gagatemarchaeum" Sheridan et al. 2023 [Bog-1369; GCA_003164815.1]

• ?"Candidatus Subgagatemarchaeum" Sheridan et al. 2023 [Fn1; IMG2558309099]

Family "Nitrosomiraceae" Zheng et al. 2024 [UBA213]

• "Candidatus Nitrosomirus" Zheng et al. 2024

Family "Nitrosocaldaceae" Qin et al. 2016

• "Candidatus Nitrosocaldus" de la Torre et al. 2008

• "Candidatus Nitrosothermus" Luo et al. 2021

Family Nitrososphaeraceae Stieglmeier et al. 2014

• "Candidatus Nitrosobungeria" Tan et al. 2026 [TH5893]

• "Candidatus Nitrosocosmicus" corrig. Lehtovirta-Morley et al. 2016

• "Candidatus Nitrosomicrobium" Tan et al. 2026 [TA-21]

• "Candidatus Nitrosopolaris" Pessi, Rutanen & Hultman 2022 ["Ca. Flebogarcha" Pallen, Rodriguez-R & Alikhan 2022]

• ?"Candidatus Nitrososappho" Singleton et al. 2025

• Nitrososphaera Stieglmeier et al. 2014

Family Nitrosopumilaceae Qin et al. 2017

• "Ca. Cenarchaeum" DeLong & Preston 1996

• Nitrosarchaeum corrig. Jung et al. 2018

• "Candidatus Nitrosoabyssus" Garritano et al. 2024

• ?"Candidatus Nitrosokoinonia" Glasl et al. 2023

• "Candidatus Nitrosomaritimum" Zhao et al. 2024

• "Candidatus Nitrosopelagicus" Santoro et al. 2015

• Nitrosopumilus Qin et al. 2017 ["Ca. Nitrosomarinus" Ahlgren et al. 2017]

• ?"Candidatus Nitrosospongia" Moeller et al. 2019

• Nitrosotalea Lehtovirta 2024

• "Candidatus Nitrosotenuis" Lebedeva et al. 2013

Class Methanosuratincolia

Order "Methanohydrogenicales"

Family "Methanohydrogenicaceae" Berghuis et al. 2019

• ?"Candidatus Methanohydrogenicus" Berghuis et al. 2019

Order "Methanomethylarchaeales"

Family "Methanomethylarchaeceae" corrig. Hua et al. 2019

• ?"Candidatus Methanomethylarchaeum" corrig. Hua et al. 2019

Order "Methanomethylovorales"

Family "Methanomethylovoraceae" Hua et al. 2019

• ?"Candidatus Methanomethylovorus" Hua et al. 2019

Order "Methanonezhaarchaeales"

Family "Methanohydrogenotrophicaceae" Hua et al. 2019

• ?"Candidatus Methanogearchaeum" corrig. Hua et al. 2019

• ?"Candidatus Methanohydrogenotrophicum" Hua et al. 2019

Family "Methanonezhaarchaeceae" Kohtz, Nupp & Hatzenpichler 2025 [WYZ-LMO8]

• "Candidatus Methanonezhaarchaeum" Kohtz, Nupp & Hatzenpichler 2025 [WYZ-LMO8]

• Family "Muzhaarchaeaceae" [B40-G2: B40-G2]

Order "Culexarchaeales"

Family "Culexarchaeaceae" Kohtz et al. 2022 ["Methanomediaceae" Berghuis et al. 2019]

• "Candidatus Culexarchaeum" Kohtz et al. 2022 ["Ca. Methanomedium" Berghuis et al. 2019]

Family "Culexmicrobiaceae" Kohtz et al. 2022

• "Candidatus Culexmicrobium" Kohtz et al. 2022

Family B10-G16

• "Candidatus Culexmicrobium_B"

Order Methanosuratincolales

Family Methanosuratincolaceae Wu et al. 2025

• ?"Candidatus Methanoluiimicrobium" Wu et al. 2024

• "Candidatus Methanomethylicus" Vanwonterghem et al. 2016

• ?"Candidatus Methanostamsia" Wu et al. 2024

• Methanosuratinicola Wu et al. 2025

Class ThermoproteiThermoproteia

Order "Gearchaeales"

Family "Gearchaeaceae" corrig.

• ?Geoarchaeum (sic) Hunt et al. 2016

Order Thermofilales

Family Thermofilaceae Burggraf, Huber & Stetter 1997

• Infirmifilum Zayulina et al. 2021

• Thermofilum Zillig & Gierl 1983

Order ThermoprotealesThermoproteales

Family Thermocladiaceae Chuvochina et al. 2024

• Caldivirga Itoh et al. 1999

• Thermocladium Itoh, Suzuki & Nakase 1998

• Vulcanisaeta Itoh, Suzuki & Nakase 2002

Family Thermoproteaceae Zillig & Stetter 1982

• Pyrobaculum Huber, Kristjansson & Stetter 1988

• Thermoproteus Zillig & Stetter 1982

Class "Sulfolobia"

Order "Tardisphaerales"

• Family "Marsarchaeaceae" (sic) (NAG2, NCGII)

Family "Tardisphaerace" Prokofeva et al. 2025

• ?"Tardisphaera" Prokofeva et al. 2025

Order SulfolobalesSulfolobales

Family Desulfurococcaceae Zillig & Stetter 1983

• Desulfurococcus Zillig & Stetter 1983

• Staphylothermus Stetter & Fiala 1986

• ?Sulfophobococcus Hensel et al. 1997

• Thermogladius Osburn & Amend 2011 ex Kochetkova et al. 2016

• Thermosphaera Huber et al. 1998

• ?"Candidatus Zestomicrobium" Dzhuraeva, Bobodzhanova & Birkeland 2024

Family Fervidicoccaceae Perevalova et al. 2010

• Fervidicoccus Perevalova et al. 2010

Family Pyrodictiaceae Burggraf, Huber & Stetter 1997

• ?Geogemma Kashefi, Holmes & Lovley 2006

• Hyperthermus Zillig, Holz & Wunderl 1991

• Pyrodictium Stetter, König & Stackebrandt 1984

• "Pyrofollis" Miyazaki et al. 2023

• Pyrolobus Blochl et al. 1999

Family Acidilobaceae Prokofeva et al. 2009

• Aeropyrum Sako et al. 1996

• Acidilobus Prokofeva et al. 2000

• Caldisphaera Itoh et al. 2003 ["Ca. Hestiella" St-John and Reysenbach 2024]

• "Candidatus Calypsonella" St John and Reysenbach 2024

• ?Stetteria Jochimsen, Peinemann-Simon & Thomm 1998

• Thermodiscus Stetter 2003

• "Candidatus Tiamatella" St John and Reysenbach 2024

Family Ignisphaeraceae RChuvochina et al. 2024

• Ignisphaera Niederberger et al. 2006

Family "Zestosphaeraceae" Pallen, Rodriguez-R & Alikhan 2022

• Zestosphaera St. John et al. 2021

Family Ignicoccaceae Chuvochina et al. 2024

• Ignicoccus Huber, Burggraf & Stetter 2000

Family Sulfolobaceae Stetter 1989

• Acidianus Segerer et al. 1986 ["Sulfosphaerellus" Zhong et al. 1982; Desulfurolobus Zillig & Böck 1987]

• "Candidatus Aramenus" Servín-Garcidueñas & Martínez-Romero 2014

• ?"Caldariella" de Rosa, Gambacorta & Bu'lock 1975

• Metallosphaera Huber et al. 1989

• Saccharolobus Sakai & Kurosawa 2018

• Stygiolobus Segerer et al. 1991

• Sulfodiicoccus Sakai & Kurosawa 2017

• Sulfolobus Brock et al. 1972

• Sulfuracidifex Itoh et al. 2020

• Sulfurisphaera Kurosawa et al. 1998

• ?Sulfurococcus Golovacheva, Vale’kho & Troitskii 1995

Phylum AGJL01

Class "MethanococciMethanococcia"

Order MethanococcalesMethanococcales

Family Methanocaldococcaceae Whitman 2002

• Methanocaldococcus Whitman 2002

Family Methanococcaceae Balch & Wolfe 1981

• Methanococcus Kluyver & van Niel 1936

• Methanofervidicoccus Sakai et al. 2019

• Methanothermococcus Whitman 2002

• Methanotorris Whitman 2002 ["Methanoignis" Boone, Whitman & Rouviére 1993]

Phylum JAADCQ01

Class "MethanopyriMethanopyria"

Order MethanopyralesMethanopyrales

Family Methanopyraceae Huber & Stetter 2002

• Methanopyrus Kurr et al. 1992

Phylum "HydrothermarchaeotaHydrothermarchaeota"

Class "Hydrothermarchaeia"

Order "Hydrothermarchaeales"

Family "Hydrothermarchaeaceae" Chuvochina et al. 2019

• "Candidatus Hydrothermarchaeum" Chuvochina et al. 2019

Family BMS3B

• "Candidatus Pyrohabitans" Adam et al. 2022

Phylum "HadarchaeotaHadarchaeota"

Class "PersephonarchaeiaPersephonarchaeia"

Class "Hadarchaeia"

Order "Hadarchaeales"

Family "Cerberiarchaeaceae" Benito Merino et al. 2024

• ?"Candidatus Cerberiarchaeum" Benito Merino et al. 2024

• ?"Candidatus Melinoarchaeum" Yu et al. 2024

Family "Hadarchaeaceae" Chuvochina et al. 2019 ex Chuvochina et al. 2023

• "Candidatus Hadarchaeum" Chuvochina et al. 2019

• ?"Candidatus Hadesarchaeum" Hua et al. 2019

• ?"Candidatus Methanourarchaeum" Hua et al. 2019

Phylum Methanobacteriota_B

Class "TheionarchaeiaTheionarchaeia"

Class "ThermococciThermococcia"

Order "Methanofastidiosales"

Family "Methanofastidiosaceae" Rinke et al. 2020

• "Candidatus Methanofastidiosum" Nobu et al. 2016

Order ThermococcalesThermococcales

Family Thermococcaceae Zillig et al. 1988

• Palaeococcus Takai et al. 2000

• Pyrococcus Fiala & Stetter 1986

• Thermococcus Zillig 1983 ["Caldococcus" Svetlichny et al. 1987]

Phylum MethanobacteriotaMethanobacteriota

Class "MethanobacteriaMethanobacteriia"

Order DSM-2088

Family Methanothermaceae Stetter et al. 1982

• Methanothermus Stetter et al. 1982

Order MethanobacterialesMethanobacteriales

Family Methanothermobacteraceae Chuvochina et al. 2024

• Methanothermobacter Wasserfallen et al. 2000

Family Methanobacteriaceae Barker 1956

• "Methanacia" Protasov & Brune 2023

• "Methanarmilla" Protasov & Brune 2023

• Methanobacterium Kluyver & van Niel 1936

• "Methanobaculum" Protasov & Brune 2023

• "Methanobinarius" Protasov & Brune 2023

• Methanobrevibacter Balch & Wolfe 1981

• "Methanocatella" Protasov & Brune 2023

• "Methanoflexus" Protasov & Brune 2023

• "Methanorudis" Protasov & Brune 2023

• Methanosphaera Miller & Wolin 1985

• "Methanovirga" Protasov & Brune 2023

Phylum ThermoplasmatotaThermoplasmatota

Class "Izemarchaea"

Order "ThermoprofundalesThermoprofundales"

• (MBG-D, E2)

Class "Poseidoniia"

Order MGIII

Order "Poseidoniales"

Family "Poseidoniaceae" Rinke et al. 2019

• "Candidatus Poseidonia" Rinke et al. 2019

Family "Thalassarchaeaceae" Rinke et al. 2019

• "Candidatus Thalassarchaeum" corrig. Martin-Cuadrado et al. 2015

Class "Penumbrarchaeia"

Order "Penumbrarchaeales"

Family "Penumbrarchaeaceae" Maeke et al. 2025

• "Candidatus Penumbrarchaeum" Maeke et al. 2025

Class "ThermoplasmataThermoplasmatia"

Order "Angelarchaeales"

Order "Luniplasmatales"

Family "Lunaplasmataceae" (sic) Zinke et al. 2021

• ?"Candidatus Lunaplasma" (sic) Zinke et al. 2021

Order "Proteinoplasmatales"

• (SG8-5)

Order "YaplasmatalesYaplasmatales"

• (RBG-16-68-12) [incl. "Detorarchales" Pallen & Alikhan 2021; "Limitiplasmatales" corrig. Zheng et al. 2022]

Order "Sysuiplasmatales"

Family "Sysuiplasmataceae" Yuan et al. 2021

• "Candidatus Sysuiplasma" Yuan et al. 2021

Order "Gimiplasmatales"

Family "Gimiplasmataceae" Hu et al. 2020

• "Candidatus Gimiplasma" Hu et al. 2020 (UA10834)

Order MethanomassiliicoccalesMethanomassiliicoccales

Family "Methanomixtatrophicaceae" Hua et al. 2019

• ?"Candidatus Methanomixtatrophicum" Hua et al. 2019

Family Methanomassiliicoccaceae Iino et al. 2013

• Methanomassiliicoccus Dridi et al. 2012

Family Methanomethylophilaceae Gaci et al. 2014 ex Borrel et al. 2024

• "Methanarcanum" Chibani et al. 2023

• "Methanogranum" Iino et al. 2023

• Methanomethylophilus Borrel et al. 2024

• "Candidatus Methanomicula" Protasov & Brune 2023 ["Ca. Cribefarcha" Pallen, Rodriguez-R & Alikhan 2022]

• "Methanoplasma" Lang & Brune 2023

• "Methanoprimaticola" Chibani et al. 2023

• ?"Candidatus Methanospyradousia" Gilroy et al. 2021

Order "Halarchaeoplasmatales"

Family "Halarchaeoplasmataceae" Zhou et al. 2023 (PWKY01)

• "Candidatus Haladaptiplasma" corrig. Zhou et al. 2022

• "Candidatus Halarchaeoplasma" Zhou et al. 2023 ["Ca. Haloplasma" Zhou et al. 2022 non Antunes et al. 2008]

• "Candidatus Natronoplasma" Zhou et al. 2022

• "Candidatus Saliniplasma" Zhou et al. 2022

Order "Lutacidiplasmatales"

Family "Lutacidiplasmataceae" Sheridan et al. 2022

• "Candidatus Lutacidiplasma" Sheridan et al. 2022 (UBA184)

Order ThermoplasmatalesThermoplasmatales

Family "Aciduliprofundaceae" Rinke et al. 2020

• "Aciduliprofundum" Reysenbach et al. 2006 (DHVE2 group)

Family Thermoplasmataceae Reysenbach 2002

• Acidiplasma Golyshina et al. 2009

• ?"Candidatus Carboxiplasma" Bulaev et al. 2023

• Cuniculiplasma corrig. Golyshina et al. 2016

• Ferroplasma Golyshina et al. 2000

• ?Oxyplasma Golyshina et al. 2024

• Picrophilus Schleper et al. 1996

• ?"Candidatus Scheffleriplasma" Krause et al. 2022

• Thermogymnomonas Itoh, Yoshikawa & Takashina 2007

• Thermoplasma Darland et al. 1970

Phylum HalobacteriotaHalobacteriota

Halobacteriota incertae sedis

• ?"Candidatus Methanoinsularis" Ou et al. 2022

• ?"Candidatus Methanoporticola" Ou et al. 2022

Class Methanonatronarchaeia

Order Methanonatronarchaeales

Family Methanonatronarchaeaceae Sorokin et al. 2018

• "Candidatus Methanohalarchaeum" Sorokin et al. 2018

• Methanonatronarchaeum Sorokin et al. 2018

Class "Methanoliparia"

Order "Methanoliparales"

Family "Methanoliparaceae" Borrel et al. 2019

• "Candidatus Methanoliparum" Borrel et al. 2019

• "Candidatus Methanolliviera" Borrel et al. 2019

Class "ArchaeoglobiArchaeoglobia"

Order "Mnemosynellales"

Family "Mnemosynellaceae" Adam et al. 2022

• "Candidatus Mnemosynella" Adam et al. 2022

Order ArchaeoglobalesArchaeoglobales

Family "Allopolytropaceae" corrig. Boyd et al. 2019

• ?"Candidatus Allopolytropus" corrig. Boyd et al. 2019 ["Ca. Polytropus" Boyd et al. 2019 non Kirsch 1866]

Family Archaeoglobaceae Huber & Stetter 2002

• Archaeoglobus Stetter 1988

• Ferroglobus Hafenbradl et al. 1997

• Geoglobus Kashefi et al. 2002

• ?"Candidatus Methanoglobus" Buessecker et al. 2023

• ?"Candidatus Methanomixotrophus" corrig. Liu et al. 2021

• ?"Candidatus Methanoproducendum" Hua et al. 2019

Class Bog-38

Order "Methanoflorentales"

Family "Methanoflorentaceae" Mondav et al. 2014

• "Candidatus Methanoflorens" Mondav et al. 2014

Class Methanocellia

Order Methanocellales

Family Methanocellaceae Sakai et al. 2008

• Methanocella Sakai et al. 2008

• Methanooceanicella Zhang et al. 2024

Class "Syntropharchaeia"

Order "Aerarchaeales"

Family YL-1

• "Candidatus Methanodefluvium" Leu et al. 2025

Family "Aerarchaeaceae" Leu et al. 2025 [CG-2]

• "Candidatus Aerarchaeum" Leu et al. 2025 (GG-2)

• "Candidatus Aerovita" Leu et al. 2025 (CM-1, CG-1, MW-1)

Order "Syntropharchaeales"

Family "Syntropharchaeaceae" (ANME-2 cluster)

• "Candidatus Syntropharchaeum" corrig. Laso-Perez et al. 2016

Order "Alkanophagales"

• Family ?"Veteromethanophagaceae" Vulcano et al. 2022

Family "Alkanophagaceae" [B39-G2]

• "Candidatus Alkanophaga" Zehnle et al. 2023

Family "Methanospirantaceae" corrig. Laso-Pérez et al. 2022

• ?"Candidatus Methanoalium" Chadwick et al. 2022

• "Candidatus Methanophaga" Chadwick et al. 2022

• "Candidatus Methanospirans" corrig. Laso-Pérez et al. 2022

• "Candidatus Methanoxibalbella" corrig. Laso-Pérez et al. 2022

Order Methanosarcinales_A

Family Methermicoccaceae Cheng et al. 2007

• Methermicoccus Cheng et al. 2007

Class Methanosarcinia

Order Methanotrichales

Family Methanotrichaceae Akinyemi et al. 2021

• "Candidatus Methanocrinis" Khomyakova et al. 2023

• Methanothrix Huser, Wuhrmann & Zehnder 1983 [Methanosaeta Patel & Sprott 1990]

Order MethanosarcinalesMethanosarcinales

Family "Methanocomedentaceae" corrig. Chadwick et al. 2022

• "Candidatus Methanocomedens" Chadwick et al. 2022 (ANME-2a)

• "Candidatus Methanomarinus" Chadwick et al. 2022 (ANME-2b)

Family "Ethanoperedentaceae" (sic) Pallen, Rodriguez-R & Alikhan 2022 (EX4572-44)

• "Ca. Argarchaeum" corrig. Chen et al. 2019 ["Candidatus Ethaniperedens" corrig. Hahn et al. 2020]

Family "Methanoperedentaceae" corrig. Haroon et al. 2013

• "Candidatus Methanoperedens" Haroon et al. 2013 (ANME-2d, AAA)

Family "Methanogastraceae" corrig. Chadwick et al. 2022 (ANME-2c)

• "Candidatus Methanogaster" Chadwick et al. 2022

Family Methanosarcinaceae Balch & Wolfe 1981

• ?Halomethanococcus Yu & Kawamura 1988

• Methanimicrococcus corrig. Sprenger et al. 2000

• Methanococcoides Sowers & Ferry 1985

• "Methanofrustulum" Protasov & Brune 2023

• Methanohalobium Zhilina & Zavarzin 1988

• Methanohalophilus Paterek & Smith 1988

• Methanolapillus Protasov & Brune 2025

• Methanolobus König & Stetter 1983

• Methanomethylovorans Lomans et al. 2004

• Methanosalsum Boone & Baker 2002

• Methanosarcina Kluyver & van Niel 1936

• ?"Candidatus Methanovorans" Chadwick et al. 2022 (ANME-3)

Class "MethanomicrobiaMethanomicrobia"

Order MethanomicrobialesMethanomicrobiales

Family Methanofollaceae Chuvochina et al. 2024

• Methanofollis Zellner et al. 1999

Family Methanocorpusculaceae Zellner et al. 1989

• Methanocalculus Ollivier et al. 1998

• Methanocorpusculum Zellner et al. 1988 ["Methanorbis" Protasov & Brune 2023]

Family Methanospirillaceae Boone et al. 2002

• "Methanofilum" Protasov & Brune 2023

• Methanolinea Imachi et al. 2008

• Methanoregula Brauer et al. 2011

• Methanosphaerula Cadillo-Quiroz et al. 2009

• Methanospirillum Ferry, Smith & Wolfe 1974

Family Methanoculleaceae Chuvochina et al. 2024

• Methanoculleus Maestrojun et al. 1990

Family Methanomicrobiaceae Balch & Wolfe 1981

• Methanochimaera Zhou et al. 2024

• Methanogenium Romesser et al. 1981

• Methanolacinia Zellner et al. 1990

• Methanomicrobium Balch & Wolfe 1981 [Methanoeremita Zhou et al. 2024]

• Methanoplanus Wildgruber et al. 1984

• Methanovulcanius Chien et al. 2023

Class "Ordosarchaeia"

Order "Ordosarchaeales"

Family "Ordosarchaeaceae" Zhao et al. 2024

• ?"Candidatus Ordosarchaeum" Zhao et al. 2024

Class HalobacteriaHalobacteria

Order HalobacterialesHalobacteriales

• ?"Haloalcalophilium" Lizama et al. 2000a

Family "Abyssiniarchaeaceae" Gutiérrez-Preciado et al. 2024

• ?"Candidatus Abyssiniarchaeum" Gutiérrez-Preciado et al. 2024 (DAL-8mg-83m_91C4R)

Family "Karumarchaeaceae" Gutiérrez-Preciado et al. 2024

• ?"Candidatus Karumarchaeum" Gutiérrez-Preciado et al. 2024 (DAL-8mg-83m_91C4R)

Family "Afararchaeaceae" Baker et al. 2024

• "Candidatus Afararchaeum" Baker et al. 2024

Family Halorutilaceae Durán-Viseras et al. 2023

• Halorutilus Durán-Viseras et al. 2023

Family "Hikarchaeaceae" Martijn et al. 2020 (MG-IV)

• "Candidatus Chewarchaeum" Baker et al. 2024

• "Candidatus Hikarchaeum" Martijn et al. 2020

Family "Salinarchaeaceae"

• Salinarchaeum Cui et al. 2014

Family Halalkalicoccaceae Mao et al. 2025

• Halalkalicoccus Xue et al. 2005

• Natronorarus Mao et al. 2025

Family Haladaptataceae Rinke et al. 2020

• Haladaptatus Savage et al. 2007

• Halomicrococcus Chen et al. 2020

• Halorussus Cui et al. 2014

Family Halobacteriaceae

• Halanaeroarchaeum Sorokin et al. 2016

• Halarchaeum Minegishi et al. 2010

• Halobacterium (Elazari-Volcani 1940) Elazari-Volcani 1957 ["Halobacter" Anderson 1954]

• Halocalculus Minegishi et al. 2015

• Halodesulfurarchaeum Sorokin et al. 2017

• Halospeciosus Li et al. 2024

• Salarchaeum Shimane et al. 2011

Family Natronoarchaeaceae Sorokin et al. 2023

• Halostella Song et al. 2016

• Natranaeroarchaeum Sorokin et al. 2023

• Natronoarchaeum Shimane et al. 2010

Family Natrialbaceae Gupta et al. 2015

• Haloarchaeobius Makhdoumi-Kakhki et al. 2012

• Halomontanus Mao et al. 2024 [Natronoglomus Sorokin et al. 2025]

• Halopiger Gutierrez et al. 2007

• Halorubellus Cui et al. 2014

• Halosolutus Sun et al. 2022

• Halostagnicola Castillo et al. 2006

• Haloterrigena Ventosa et al. 1999

• Halovalidus Dong et al. 2025

• Halovivax Castillo et al. 2006

• Natrarchaeobaculum Sorokin et al. 2020

• Natrarchaeobius corrig. Sorokin et al. 2020

• Natrialba Kamekura & Dyall-Smith 1996

• Natribaculum Liu et al. 2015 [Halovarius Mehrshad et al. 2015]

• Natronobacterium Tindall et al. 1984 [Halobiforma Hezayen et al. 2002]

• Natronobiforma Sorokin et al. 2019

• Natronococcus Tindall et al. 1984

• Natronolimnobius Itoh et al. 2005

• Natronolimnohabitans Sorokin et al. 2020

• Natrinema McGenity et al. 1998

• Natronobeatus Li et al. 2023

• Natrononativus Li et al. 2023

• Natronorubrum Xu et al. 1999

• Natronosalvus Tan et al. 2023

• Salinadaptatus Xue et al. 2020

• Salinilacihabitans Li et al. 2023

• Saliphagus Yin et al. 2017

Family Halococcaceae Gupta et al. 2016

• Halococcus Schoop 1935

Family Haloarculaceae

• Halapricum Song et al. 2014 ["Halarchaeoglobus" Sorokin et al. 2021]

• Haloarcula Torreblanca et al. 1986 [Halomicroarcula Echigo et al. 2013]

• Halocatena Verma et al. 2020 [Actinarchaeum corrig. Tang et al. 2024]

• Halococcoides Sorokin et al. 2019

• Haloglomus Duran-Viseras, Sanchez-Porro & Ventosa 2020

• Halomarina Inoue et al. 2011

• Halomicroarcula Echigo et al. 2013

• Halomicrobium Oren et al. 2002 [Halosiccatus Mehrshad et al. 2016]

• Halorientalis Cui et al. 2011

• Halorarius Sun et al. 2023

• Halorhabdus Waino et al. 2000

• Halosegnis Duran-Viseras et al. 2022 [Sala Song et al. 2023 non Ross 1937 non Walker 1867; Salella Deshmukh & Oren 2023]

• Halosimplex Vreeland et al. 2003

• Halovenus Makhdoumi-Kakhki et al. 2012

• Natronomonas Kamekura et al. 1997

• Salinibaculum Han & Cui 2020

• Salinirubellus Hou et al. 2018

• Salinirussus Cui et al. 2017

Family Haloferacaceae Gupta et al. 2015

• Halalkaliarchaeum Sorokin et al. 2019

• Halalkalirubrum Zuo et al. 2021

• ?"Candidatus Halectosymbiota" corrig. Filker et al. 2014

• Halegenticoccus Liu et al. 2022

• Halobaculum Oren et al. 1995

• Halobium Mori et al. 2016

• "Candidatus Halobonum" Ugalde et al. 2013

• Haloferax Torreblanca et al. 1986

• Halogeometricum Montalvo-Rodriguez et al. 1998 [Halosarcina Savage et al. 2008]

• Halogranum Cui et al. 2010

• Halohasta Mou et al. 2013

• Halolamina Cui et al. 2011

• Halonotius Burns et al. 2010

• ?"Halonovum" Hwang et al. 2025

• Haloparvum Chen et al. 2016

• Halopelagius Cui et al. 2010

• Halopenitus Amoozegar et al. 2012

• Haloplanus Elevi Bardavid et al. 2007

• Haloprofundus Zhang et al. 2017

• Haloquadratum Burns et al. 2007 [Halobellus Cui et al. 2011]

• Halorubrum McGenity & Grant 1996 [Halorubrobacterium Kamekura & Dyall-Smith 1996]

• ?Halosubterraneus Ding et al. 2026

• ?Halotolerantifilum Fisher et al. 2026

• Natronocalculus Sorokin et al. 2023

• Salinigranum Cui & Zhang 2014

• Salinirarus Zhang et al. 2025

• Salinirubrum corrig. Cui & Qiu 2014

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 bacteria genera

• List of bacterial orders

References