List of Archaea genera

This article lists the genera of the Archaea. The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN)^[1] and National Center for Biotechnology Information (NCBI).^[2] However, in the List provided below, GTDB has precedence unless otherwise noted.

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.^{[3][4][5][6][7]}

Cladogram was taken from the GTDB release 10-RS226 (16th April 2025).^[8][9][10] The position of clades with a "question mark" are based on the additional phylogeny of the 16S rRNA-based LTP_12_2021 by The All-Species Living Tree Project.^[11][12][13]

Archaea Nanobdellati "Altarchaeota" "Iainarchaeota" "Micrarchaeota" "Undinarchaeota" "Huberarchaeaota" "Aenigmarchaeota" "Nanohalarchaeota" Nanobdellota "Methanomada" "Hadarchaeota" Methanobacteriota_B "Hydrothermarchaeota" Methanobacteriota Thermoplasmatota Halobacteriota "Proteoarchaeota" "Korarchaeota" "Korarchaeota" Promethearchaeati Promethearchaeota Thermoproteati Thermoproteota

Methanobacteriati

Phylum Microcaldota

Class Microcaldia

Order Microcaldales

• Family Microcaldaceae Sakai et al. 2023
  •  ?Microcaldus Sakai et al. 2023

Phylum "Altarchaeota"

Class "Altarchaeia"

Order "Altarchaeales"

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

Phylum "Iainarchaeota"

Class "Iainarchaeia"

Order "Forterreales"

• Family "Forterreaceae" Pallen, Rodriguez-R & Alikhan 2022
  • "Candidatus Forterrea" Probst & Banfield 2017

Order "Iainarchaeales"

• Family "Iainarchaeaceae" Rinke et al. 2020
  • "Candidatus Iainarchaeum" Rinke et al. 2013

Phylum "Micrarchaeota"

Phylogeny of Micrarchaeota[8][9][10]

"Norongarragalinales" "Ca. Norongarragalina" "Micrarchaeales" "Micrarchaeaceae" "Ca. Mancarchaeum" "Ca. Micrarchaeum" "Anstonellales" "Anstonellaceae" "Ca. Anstonella" "Bilamarchaeaceae" "Ca. Bilamarchaeum" "Gugararchaeales" "Ca. Gugararchaeum" "Burarchaeales" "Ca. Burarchaeum" "Fermentimicrarchaeales" "Ca. Fermentimicrarchaeum"

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 "Gugararchaeales"

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

Order "Burarchaeales"

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

Order "Fermentimicrarchaeales"

• Family "Fermentimicrarchaeaceae" Kadnikov et al. 2020 (Sv326)
  • "Candidatus Fermentimicrarchaeum" Kadnikov et al. 2020

Phylum "Undinarchaeota"

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 "Huberarchaeaota"

Class "Huberarchaeia"

Order "Huberarchaeales"

• Family "Huberarchaeaceae" Rinke et al. 2020
  • "Candidatus Huberarchaeum" corrig. Schwank et al. 2019

Phylum "Aenigmatarchaeota"

Class "Aenigmatarchaeia"

Order "Aenigmatarchaeales"

• Family "Aenigmatarchaeaceae" corrig. Rinke et al. 2020
  • "Candidatus Aenigmatarchaeum" corrig. Rinke et al. 2013

Phylum "Nanohalarchaeota"

Phylogeny of Nanohalobiales[8][9][10]

"Nanohalalkaliarchaeaceae" "Candidatus Nanohalalkaliarchaeum" "Nanoanaerosalinaceae" "Candidatus Asbonarchaeum" "Candidatus Nanoanaerosalina" "Nanohalobiaceae" "Candidatus Nanosalinicola" "Candidatus Nanohalococcus" "Candidatus Nanohalobium" "Candidatus Nanohalovita" "Candidatus Nanosalina"

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 "Nanoanaerosalinaceae" Zhao et al. 2022
  • "Candidatus Asbonarchaeum" Baker et al. 2024
  • "Candidatus Nanoanaerosalina" Zhao et al. 2022
• Family "Nanohalalkaliarchaeaceae" La Cono et al. 2020
  • "Candidatus Nanohalalkaliarchaeum" Ghai et al. 2011
• 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 Nanobdellota

Phylogeny of Nanobdellota[8][9][10]

"Pacearchaeales" "Woesearchaeales" Nanobdellales "Nanoarchaeaceae" "Nanoarchaeum" Nanobdellaceae "Ca. Nanoclepta" Nanobdella "Tiddalikarchaeales" "Tiddalikarchaeaceae" "Ca. Tiddalikarchaeum" "Jingweiarchaeales" "Jingweiarchaeaceae" "Ca. Jingweiarchaeum" "JAPDLS01" "Haiyanarchaeaceae" "Ca. Haiyanarchaeum" "Parvarchaeales" "Parvarchaeaceae" "Ca. Rehaiarchaeum" "Ca. Acidifodinimicrobium" "Ca. Parvarchaeum"

Class Nanobdellia

Nanobdellia incertae sedis

• "Mamarchaeales"
• "Pacearchaeales" (DHVE-5, DUSEL-1)
• "Wiannamattarchaeales" Vazquez-Campos et al. 2019 (LFWA-II, Eury4AB)
• "Woesearchaeales" (DHVE-6)

Order JAPDLS01

• Family "Haiyanarchaeaceae" Rao et al. 2023
  • "Candidatus Haiyanarchaeum" Rao et al. 2023

Order "Jingweiarchaeales"

• Family "Jingweiarchaeaceae" Rao et al. 2023
  • "Candidatus Jingweiarchaeum" Rao et al. 2023

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 ["Candidatus Nanobsidianus" Castelle et al. 2015; "Candidatus 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 "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 Promethearchaeota

Phylogeny of Promethearchaeota[8][9][10]

"Asgardarchaeia" "Asgardarchaeales" "Atabeyarchaeia" "Atabeyarchaeales" "Sifarchaeia" "Borrarchaeales" "Sifarchaeales" "Wukongarchaeia" "Wukongarchaeales" "Njordarchaeia" "Njordarchaeales" "Heimdallarchaeia" "Hodarchaeales" "Gerdarchaeales" (JABLTI01) "Heimdallarchaeales" "Odinarchaeia" "Odinarchaeales" "Jordarchaeia" "Jordarchaeales" "Baldrarchaeia" "Baldrarchaeales" "Thorarchaeia" "Thorarchaeales" "Hermodarchaeia" "Hermodarchaeales" Promethearchaeia "Helarchaeales" Promethearchaeales

Promethearchaeota incertae sedis

• Class "Balderarchaeia"
  • Order "Balderarchaeales"
    • Family "Balderarchaeaceae" (sic) Xie et al. 2022
      •  ?"Candidatus Balderarchaeum" (sic) Xie et al. 2022
• Class "Tyrarchaeia"
  • Order "Tyrarchaeales"
    • Family "Tyrarchaeaceae" Xie et al. 2022
      •  ?"Candidatus Tyrarchaeum" Xie et al. 2022

• Class "Friggarchaeia"
• Class "Gefionarchaeia"
• Class "Idunnarchaeia"

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 "Atabeyarchaeia"

Order "Atabeyarchaeales"

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

Class "Sifarchaeia"

Order "Borrarchaeales"

• Family "Borrarchaeaceae" Liu et al. 2021
  • "Candidatus Borrarchaeum" Liu et al. 2021

Order "Sifarchaeales"

• Family "Sifarchaeaceae" Sun et al. 2021
  • "Candidatus Sifarchaeum" corrig. Farag, Zhao & Biddle 2020

Class "Wukongarchaeia"

Order "Wukongarchaeales"

• Family "Wukongarchaeaceae" Liu et al. 2021
  • "Candidatus Wukongarchaeum" Liu et al. 2021

Class "Njordarchaeia"

Order "Njordarchaeales"

• Family "Njordarchaeaceae" Xie et al. 2022
  • "Candidatus Njordarchaeum" Xie et al. 2022^[14][15][16]
• Family "Panguiarchaeaceae" Qu et al. 2023
  • "Candidatus Panguiarchaeum" Qu et al. 2023

Class "Heimdallarchaeia"

Order "Hodarchaeales"

• Family "Hodarchaeaceae" Liu et al. 2021
  • "Candidatus Hodarchaeum" Liu et al. 2021

Order "Gerdarchaeales"

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^[17]

Class "Odinarchaeia"

Order "Odinarchaeales"

• Family "Odinarchaeaceae" Tamarit et al. 2022
  • "Candidatus Odinarchaeum" Tamarit et al. 2022

Class "Jordarchaeia"

Order "Jordarchaeales"

• Family "Freyrarchaeaceae" Xie et al. 2022
  • "Candidatus Freyrarchaeum" Xie et al. 2022^[14][18]
• Family "Jordarchaeaceae" Sun et al. 2021
  • "Candidatus Jordarchaeum" Sun et al. 2021

Class "Baldrarchaeia"

Order "Baldrarchaeales"

• Family "Baldrarchaeaceae" corrig. Liu et al. 2021
  • "Candidatus Baldrarchaeum" corrig. Liu et al. 2021

Class "Thorarchaeia"

Order "Thorarchaeales"

• Family "Thorarchaeaceae" (MBG-B)

Class "Hermodarchaeia"

Order "Hermodarchaeales"

• Family "Hermodarchaeaceae" corrig. Liu et al. 2021
  • "Candidatus Hermodarchaeum" corrig. Liu et al. 2021

Class Promethearchaeia

Order "Helarchaeales"

Order Promethearchaeales

In GTDB as order CR-4

Phylogeny of Promethearchaeales[8][9][10]

"Sigynarchaeaceae" "Ca. Sigynarchaeum" Promethearchaeaceae Promethearchaeum "Ca. Harpocratesius" "Ca. Lokiarchaeum"

• Family "Sigynarchaeaceae" Xie et al. 2022^[14][19]
  • "Candidatus Sigynarchaeum" Xie et al. 2022
• Family Promethearchaeaceae Imachi et al. 2024 ["Lokiarchaeaceae" Vanwonterghem et al. 2016]
  • "Candidatus Harpocratesius" Wu et al. 2022^[17]
  • "Candidatus Lokiarchaeum" corrig. Spang et al. 2015 (MBGB, DSAG)
  • Promethearchaeum Imachi et al. 2024

Phylum "Korarchaeota"

Class "Korarchaeia"

Order "Korarchaeales"

• Family "Korarchaeaceae" Rinke et al. 2020
  • "Candidatus Korarchaeum" Elkins et al. 2008
  • "Candidatus Methanodesulfokora" McKay et al. 2019

Phylum Thermoproteota

Phylogeny of Thermoproteota[8][9][10]

"BAT" "Bathyarchaeia" "Bifangarchaeales" "Xuanwuarculales" "Hecatellales" "Houtuarculales" "Wuzhiqiibiales" "Zhuquarculales" "Bathyarchaeales" Nitrososphaeria_A "Caldarchaeales" Nitrososphaeria "Geothermarchaeales" PSMU01 Conexivisphaerales Nitrososphaerales "Sulfobacteria" "Methanomethylicia" "Nezhaarchaeales" "Culexarchaeles" "Methanomethylicales" "Thermoproteia" "Gearchaeales" "Thermofilales" Thermoproteales "Sulfolobia" "Marsarchaeales" Sulfolobales

Thermoproteota Incertae sedis

• "Brockarchaeia"

Class "Bathyarchaeia"

Order "Bifangarchaeales"

• Family "Bifangicolaceae" Hou et al. 2023
  •  ?"Candidatus Bifangicola" Hou et al. 2023 [3300025546_26]
• Family "Bifangarchaeaceae" Hou et al. 2023
  • "Candidatus Bifangarchaeum" corrig. Hou et al. 2023 [B24: DTBU01 sp011374155]
• Family "Bifangistellaceae" Hou et al. 2023
  • "Candidatus Bifangistella" Hou et al. 2023 [DRYS01: DRYS01 sp011367275]

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"

Phylogeny of "Hecatellaceae"[8][9][10]

"Ca. Hecatella" "Ca. Jinwuicola" "Ca. Jinwuimorpha"

• Family "Hecatellaceae" Rinke et al. 2020
  •  ?"Candidatus Jinwuarcula" Hou et al. 2023 [B25]
  •  ?"Candidatus Jinwuimonas" Hou et al. 2023
  •  ?"Candidatus Jinwuiprofundus" Hou et al. 2023
  •  ?"Candidatus Jinwuousia" Hou et al. 2023 [JdFR-11 sp002011035]
  • "Candidatus Hecatella" Adam et al. 2022
  • "Candidatus Jinwuicola" Hou et al. 2023 [EX4484-218 sp002254975]
  • "Candidatus Jinwuimorpha" Hou et al. 2023 [EX4484-218 sp003661965]

Order "Houtuarculales"

Phylogeny of Houtuarculales[8][9][10]

"Crenohoutuithermaceae" "Ca. Crenohoutuithermus" "Fontihoutuithermaceae" "Ca. Fontihoutuithermus" "Aphrohoutuibellaceae" "Ca. Aphrohoutuibellus" "Ca. Hydrohoutuibellus" "Houtuousiaceae" "Ca. Houtuousia" "Ca. Houtuarcula"

• 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
  •  ?"Candidatus Fluxihoutuithermus" Hou et al. 2023 [DTOY01 sp011358085]
  • "Candidatus Fontihoutuithermus" Hou et al. 2023 [DTGE01 sp011389385]
• Family "Aphrohoutuibellaceae" Hou et al. 2023
  • "Candidatus Aphrohoutuibellus" Hou et al. 2023 [RBG-13-38-9]
  • "Candidatus Hydrohoutuibellus" Hou et al. 2023 [DTMT01 sp011355205]
• Family "Houtuousiaceae" Hou et al. 2023
  •  ?"Candidatus Limnohoutuiplasma" Hou et al. 2023
  • "Candidatus Houtuarcula" Hou et al. 2023 [FEN-987]
  • "Candidatus Houtuousia" Hou et al. 2023 [40CM-2-53-6]

Order "Wuzhiqiibiales"

Phylogeny of "Wuzhiqiibiales"[8][9][10]

"Wuzhiqiimorphaceae" "Ca. Wuzhiqiimorpha" "Wuzhiqiimonadaceae" "Ca. Wuzhiqiimonas" "Wuzhiqiibiaceae" "Ca. Wuzhiqiibium"

• 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
  • "Candidatus Wuzhiqiimorpha" Hou et al. 2023 [PIYN01: PIYN01 sp003601775]
• Family "Wuzhiqiimonadaceae" Hou et al. 2023
  • "Candidatus Wuzhiqiimonas" Hou et al. 2023 [B23: 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
  • "Candidatus Zhuquomorpha" Hou et al. 2023

Order "Bathyarchaeales"

Phylogeny of "Bathyarchaeales"[8][9][10]

"Pontizhurongicolaceae" "Ca. Pontizhurongicola" "Hanbarchaeaceae" "Ca. Hanbarchaeum" "Ca. Fufeiimorpha" "Ca. Zhurongicella" "Marizhurongicellaceae" "Ca. Marizhurongibium" "Ca. Marizhurongicella" "Hanbopyraceae" "Ca. Hanbopyrus" "Jingweiiplasmataceae" "Ca. Jingweiiplasma" "Bathyarchaeaceae" "Ca. Baizosoma" "Ca. Halozhurongicella" "Ca. Baizobellus" "Ca. Bathyarchaeum" "Bathycorpusculaceae" "Ca. Baizomorpha" "Ca. Buyanhuyuitorris" "Ca. Buyanhuyuicella" "Ca. Hanbocola" "Ca. Hanbothermus" "Ca. Yanziithermus" "Ca. Yuguotorris" "Ca. Bathycorpusculum"

• 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
  •  ?"Candidatus Limnohoutuiplasma" Hou et al. 2023
  • "Candidatus Houtuarcula" Hou et al. 2023 [FEN-987]
  • "Candidatus Houtuousia" Hou et al. 2023 [40CM-2-53-6]]
• Family "Marizhurongicellaceae" Hou et al. 2023 [B26-1]
  •  ?"Candidatus Aoguangisoma" Hou et al. 2023
  •  ?"Candidatus Yanziimonas" Hou et al. 2023
  •  ?"Candidatus Zhurongibium" Hou et al. 2023
  • "Candidatus Marizhurongibium" Hou et al. 2023 [B17-G17 sp003662645]
  • "Candidatus Marizhurongicella" Hou et al. 2023 [B26-1]
• Family "Hanbopyraceae" Hou et al. 2023
  • "Candidatus Hanbopyrus" Hou et al. 2023 [WUQV01 sp009889585]
• Family "Jingweiiplasmataceae" Hou et al. 2023
  • "Candidatus Jingweiiplasma" Hou et al. 2023 [SOJC01]
• Family "Bathyarchaeaceae" Khomyakova et al. 2023
  •  ?"Candidatus Baizosediminiarchaeum" Yu et al. 2023 [BIN-L-1]
  •  ?"Candidatus Baizostella" Hou et al. 2023
  • "Candidatus Baizobellus" Hou et al. 2023 [SOJZ01]
  • "Candidatus Baizosoma" Hou et al. 2023 [BA1 sp001399805]
  • "Candidatus Bathyarchaeum" Khomyakova et al. 2023
  • "Candidatus Halozhurongicella" Hou et al. 2023 [B1-G15]
• Family "Bathycorpusculaceae" Loh & Brune 2023 [UBA233]
  •  ?"Candidatus Aoshunithermus" Hou et al. 2023
  •  ?"Candidatus Baizomonas" Hou et al. 2023
  • "Candidatus Baizomorpha" Hou et al. 2023 [UBA233]
  • "Candidatus Bathycorpusculum" Loh & Brune 2023
  • "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 Nitrososphaeria_A

Order "Caldarchaeales"

Phylogeny of "Caldarchaeales"[8][9][10]

"Calditenuaceae" "Ca. Calditenuis" "Caldarchaeaceae" "Ca. Caldarchaeum" "Ca. Pelearchaeum" "Wolframiiraptoraceae" "Ca. Terraquivivens" "Ca. Geocrenenecus" "Ca. Benthortus" "Ca. Wolframiiraptor"

• 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
• 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 Nitrososphaeria

Nitrososphaeria Incertae sedis

• "Cenoporarchaeum" corrig. Zhang et al. 2019
• "Candidatus Gigantothauma" corrig. Muller et al. 2010
• "Candidatus Nitrosodeserticola" Hwang et al. 2021

Order "Nitrosomirales"

• Family "Nitrosomiraceae" Zheng et al. 2024
  •  ?"Candidatus Nitrosomirus" Zheng et al. 2024

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

Order Nitrososphaerales

Phylogeny of Nitrososphaerales[8][9][10]

"Gagatemarchaeaceae" "Ca. Gagatemarchaeum" "Nitrosocaldaceae" "Ca. Nitrosothermus" "Ca. Nitrosocaldus" Nitrososphaeraceae "Ca. Nitrosocosmicus" Nitrososphaera "Ca. Nitrosopolaris" Nitrosopumilaceae "Ca. Nitrosotalea" "Ca. Nitrosotenuis" "Ca. Nitrosopelagicus" "Cenarchaeum" "Ca. Nitrosoabyssus" Nitrosarchaeum "Ca. Nitrosomaritimum" Nitrosopumilus

• 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 Subgagatemarchaeum" Sheridan et al. 2023 [Fn1; IMG2558309099]
  • "Candidatus Gagatemarchaeum" Sheridan et al. 2023 [Bog-1369; GCA_003164815.1]
• 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 Nitrosocosmicus" corrig. Lehtovirta-Morley et al. 2016
  • "Candidatus Nitrosopolaris" Pessi, Rutanen & Hultman 2022
  • Nitrososphaera Stieglmeier et al. 2014
• Family Nitrosopumilaceae Qin et al. 2017
  • "Cenarchaeum" DeLong & Preston 1996
  • Nitrosarchaeum corrig. Jung et al. 2018
  •  ?"Candidatus Candidatus Nitrosoabyssus" Garritano et al. 2024
  •  ?"Candidatus Candidatus Nitrosokoinonia" Glasl et al. 2023
  •  ?"Candidatus Candidatus Nitrosomaritimum" Zhao et al. 2024
  • "Candidatus Nitrosopelagicus" Santoro et al. 2015
  • Nitrosopumilus Qin et al. 2017 ["Candidatus Nitrosomarinus" Ahlgren et al. 2017]
  •  ?"Candidatus Nitrosospongia" Moeller et al. 2019
  • "Candidatus Nitrosotalea" Lehtovirta 2011
  • "Candidatus Nitrosotenuis" Lebedeva et al. 2013

Class "Methanomethylicia"

Methanomethylicia incertae sedis

• 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 "Nezhaarchaeales"

• Family "Methanohydrogenotrophicaceae" Hua et al. 2019
  •  ?"Candidatus Methanogearchaeum" corrig. Hua et al. 2019
  •  ?"Candidatus Methanohydrogenotrophicum" Hua et al. 2019

Order "Culexarchaeles"

• Family "Culexarchaeaceae" Kohtz et al. 2022 ["Methanomediaceae" Berghuis et al. 2019]
  • "Candidatus Culexarchaeum" Kohtz et al. 2022 ["Candidatus Methanomedium" Berghuis et al. 2019]
• Family "Culexmicrobiaceae" Kohtz et al. 2022
  • "Candidatus Culexmicrobium" Kohtz et al. 2022

Order "Methanomethylicales"

• Family "Candidatus Methanomethylicaceae" corrig. Vanwonterghem et al. 2016
  •  ?"Candidatus Methanoluiimicrobium" Wu et al. 2024
  • "Candidatus Methanomethylicus" Vanwonterghem et al. 2016
  •  ?"Candidatus Methanostamsia" Wu et al. 2024
  • "Candidatus Methanosuratinicola" corrig. Vanwonterghem et al. 2016

Class Thermoproteia

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 Thermoproteales

Phylogeny of Thermoproteales[8][9][10]

Thermocladiaceae Caldivirga Thermocladium Vulcanisaeta Thermoproteaceae Thermoproteus Pyrobaculum

• 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 "Marsarchaeales"

• Family "Marsarchaeaceae"

Order Sulfolobales

Phylogeny of Sulfolobales[8][9][10]

Desulfurococcaceae Staphylothermus Thermogladius Thermosphaera Desulfurococcus Fervidicoccaceae Fervidicoccus Pyrodictiaceae Pyrolobus Hyperthermus Pyrofollis Pyrodictium Acidilobaceae "Ca. Tiamatella" "Ca. Calypsonella" Thermodiscus Aeropyrum Caldisphaera Acidilobus Ignisphaeraceae Ignisphaera "Zestosphaeraceae" Zestosphaera Ignicoccaceae Ignicoccus Sulfolobaceae Sulfodiicoccus Sulfurisphaera Stygiolobus Sulfolobus Sulfuracidifex Saccharolobus Metallosphaera "Ca. Aramenus" Acidianus

• Family Desulfurococcaceae Zillig & Stetter 1983
  •  ?Caldococcus Aoshima, Yamagishi & Oshima 1996
  • 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 Ignicoccaceae Chuvochina et al. 2024
  • Ignicoccus Huber, Burggraf & Stetter 2000
• Family Acidilobaceae Prokofeva et al. 2009
  • Aeropyrum Sako et al. 1996
  • Acidilobus Prokofeva et al. 2000
  • Caldisphaera Itoh et al. 2003
  • "Candidatus Calypsonella" St John and Reysenbach 2024
  •  ?"Candidatus Hestiella" 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 Sulfolobaceae Stetter 1989
  • Acidianus Segerer et al. 1986 ["Sulfosphaerellus" Zhong et al. 1982; Desulfurolobus Zillig & Böck 1987]
  • "Candidatus Aramenus" Servín-Garcidueñas & Martínez-Romero 2014
  • 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 "Hadarchaeota"

Class "Persephonarchaeia"

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

Phylogeny of Methanobacteriota_B[8][9][10]

Thermococci "Methanofastidiales" "Ca. Methanofastidiosum" "Methanofastidiosaceae" Thermococcales Palaeococcus Thermococcus_A Thermococcus_B Pyrococcus Thermococcus Thermococcaceae

Class "Theionarchaeia"

Class Thermococci

Order "Methanofastidiosales"

• Family "Methanofastidiosaceae" Rinke et al. 2020
  • "Candidatus Methanofastidiosum" corrig. Nobu et al. 2016

Order Thermococcales

• Family Thermococcaceae Zillig et al. 1988
  • Palaeococcus Takai et al. 2000
  • Pyrococcus Fiala & Stetter 1986
  • Thermococcus Zillig 1983

Phylum "Hydrothermarchaeota"

Class "Hydrothermarchaeia"

Order "Hydrothermarchaeales"

• Family BMS3B
  • "Candidatus Pyrohabitans" Adam et al. 2022
• Family "Hydrothermarchaeaceae" Chuvochina et al. 2019
  • "Candidatus Hydrothermarchaeum" Chuvochina et al. 2019

Phylum Methanobacteriota

Phylogeny of Methanobacteriota[8][9][10]

"Methanococcia" Methanocaldococcaceae Methanocaldococcus Methanococcaceae Methanotorris Methanofervidicoccus Methanothermococcus Methanococcus Methanococcales "Methanopyria" Methanopyraceae Methanopyrus Methanopyrales "Methanobacteriia" Methanothermaceae Methanothermus Methanothermobacteraceae_A Methanothermobacter_A Methanothermobacteraceae Methanothermobacter Methanobacteriaceae "Methanacia" "Methanoflexus" "Methanovirga" "Methanorudis" "Methanobaculum" "Methanobinarius" "Methanocatella" "Methanarmilla" Methanobrevibacter Methanobacterium_E & F Methanobacterium_D Methanosphaera Methanobacterium Methanobacteriales

Class "Methanococcia"

Order Methanococcales

• 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]

Class Methanopyria

Order Methanopyrales

• Family Methanopyraceae Huber & Stetter 2002
  • Methanopyrus Kurr et al. 1992

Class Methanobacteriia

Order Methanobacteriales

• Family "Tepidaquicellaceae" corrig. Kadnikov et al. 2020
  •  ?"Candidatus Tepidaquicella" corrig. Kadnikov et al. 2020
• Family Methanothermaceae Stetter et al. 1982
  • Methanothermus Stetter et al. 1982
• 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 Thermoplasmatota

Phylogeny of Thermoplasmatota[8][9][10]

"Izemarchaea" "Thermoprofundales" "Poseidoniia" MGIII "Poseidoniales" "Thermoplasmatia" "Proteinoplasmatales" "Yaplasmatales" "Gimiplasmatales" "Sysuiplasmatales" Methanomassiliicoccales "Halarchaeoplasmatales" "Lutacidiplasmatales" "Aciduliprofundales" "Thermoplasmatales"

Class "Izemarchaea"

Order "Thermoprofundales"

• (MBG-D, E2)

Class "Poseidoniia"

Order MGIII

Order "Poseidoniales"

• Family "Poseidoniaceae" corrig. Rinke et al. 2019
  • "Candidatus Poseidonia" Rinke et al. 2019
• Family "Thalassarchaeaceae" corrig. Rinke et al. 2019
  • "Candidatus Thalassarchaeum" corrig. Martin-Cuadrado et al. 2015

Class Thermoplasmata

Order "Lunaplasmatales"

• Family "Lunaplasmataceae" Zinke et al. 2021
  •  ?"Candidatus Lunaplasma" Zinke et al. 2021

Order "Proteinoplasmatales"

• (SG8-5)

Order "Yaplasmatales"

• (RBG-16-68-12)

Order "Gimiplasmatales"

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

Order "Sysuiplasmatales"

• Family "Sysuiplasmataceae" Yuan et al. 2021
  • "Candidatus Sysuiplasma" Yuan et al. 2021

Order Methanomassiliicoccales

Phylogeny of Methanomassiliicoccales[8][9][10]

Methanomassiliicoccaceae Methanomassiliicoccus Methanomethylophilaceae "Candidatus Methanomicula" "Methanarcanum" "Methanoprimaticola" Methanomethylophilus "Methanogranum" "Methanoplasma"

• 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 corrig. Borrel et al. 2024
  • "Candidatus Methanomicula" Protasov & Brune 2023
  • "Methanoplasma" Lang & Brune 2023
  • "Methanoprimaticola" Chibani et al. 2023
  •  ?"Candidatus Methanospyradousia" Gilroy et al. 2021

Order "Halarchaeoplasmatales"

Phylogeny of Halarchaeoplasmatales[8][9][10]

"Candidatus Haladaptiplasma" "Candidatus Halarchaeoplasma" "Candidatus Natronoplasma" "Candidatus Saliniplasma"

• Family "Halarchaeoplasmataceae" Zhou et al. 2023 (PWKY01)
  • "Candidatus Haladaptiplasma" corrig. Zhou et al. 2022
  • "Candidatus Halarchaeoplasma" Zhou et al. 2023 ["Candidatus 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 "Aciduliprofundales"

• Family "Aciduliprofundaceae" Rinke et al. 2020
  • "Aciduliprofundum" Reysenbach et al. 2006 (DHVE2 group)

Order Thermoplasmatales

Phylogeny of Thermoplasmatales[8][9][10]

Thermoplasma Cuniculiplasma Thermogymnomonas Picrophilus Acidiplasma Ferroplasma

• 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 Halobacteriota

Phylogeny of Halobacteriota[8][9][10]

Methanonatronarchaeia Methanonatronarchaeales "Methanoliparia" "Methanoliparales" "Archaeoglobia" "Mnemosynellales" Archaeoglobales "Syntropharchaeia" "Syntropharchaeales" "Alkanophagales" Methanocellia Methanocellales Methanosarcinia Methanotrichales Methanosarcinales_A Methanosarcinales "Methanomicrobia" Methanomicrobiales Halobacteria Halorutilales Halobacteriales

Halobacteriota incertae sedis

•  ?"Candidatus Methanoinsularis" Ou et al. 2022
•  ?"Candidatus Methanoporticola" Ou et al. 2022

Order "Methanoflorentales"

• Family "Methanoflorentaceae" Mondav et al. 2014
  •  ?"Candidatus Methanoflorens" Mondav et al. 2014

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 "Archaeoglobia"

Phylogeny of "Archaeoglobia"[8][9][10]

"Mnemosynellales" "Mnemosynellaceae" "Candidatus Mnemosynella" Archaeoglobales Archaeoglobaceae Archaeoglobus_A & C Ferroglobus Geoglobus Archaeoglobus

Order "Mnemosynellales"

• Family "Mnemosynellaceae" Adam et al. 2022
  • "Candidatus Mnemosynella" Adam et al. 2022

Order Archaeoglobales

• Family "Allopolytropaceae" corrig. Boyd et al. 2019
  •  ?"Candidatus Allopolytropus" corrig. Boyd et al. 2019 ["Candidatus 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 "Syntropharchaeia"

Phylogeny of "Syntropharchaeia"[8][9][10]

"Syntropharchaeales" "Syntropharchaeaceae" "Candidatus Syntropharchaeum" "Alkanophagales" "Alkanophagaceae" "Candidatus Alkanophaga" "Methanospiraraceae" "Candidatus Methanoxibalbensis" "Candidatus Methanospirare"

Order "Syntropharchaeales"

• Family "Syntropharchaeaceae" corrig. (ANME-2 cluster)
  • "Candidatus Syntropharchaeum" corrig. Laso-Perez et al. 2016

Order "Alkanophagales"

• Family "Methanophagaceae" Chadwick et al. 2022
  •  ?"Candidatus Methanoalium" Chadwick et al. 2022
  •  ?"Candidatus Methanophaga" Chadwick et al. 2022
• Family ?"Veteromethanophagaceae" Vulcano et al. 2022
• Family "Alkanophagaceae" [B39-G2]
  • "Candidatus Alkanophaga" Zehnle et al. 2023
• Family "Methanospiraraceae" Laso-Pérez et al. 2022
  • "Candidatus Methanospirare" Laso-Pérez et al. 2022
  • "Candidatus Methanoxibalbensis" Laso-Pérez et al. 2022

Class Methanocellia

Order Methanocellales

Phylogeny of Methanocellales[8][9][10]

Methanocellaceae Methanooceanicella Methanocella_A Methanocella

• Family Methanocellaceae Sakai et al. 2008
  • Methanocella Sakai et al. 2008
  • Methanooceanicella Zhang et al. 2024

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 Methanosarcinales_A

• Family Methermicoccaceae Cheng et al. 2007
  • Methermicoccus Cheng et al. 2007

Order Methanosarcinales

Phylogeny of Methanosarcinales[8][9][10]

"Methanogastraceae" "Ca. Methanogaster" "Methanocomedentaceae" "Ca. Methanocomedens" "Ca. Methanomarinus" "Ethanoperedentaceae" "Ca. Ethaniperedens" "Methanoperedentaceae" "Ca. Methanoperedens" Methanosarcinaceae "Methanofrustulum" "Methanolapillus" Methanimicrococcus Methanosarcina Methanohalobium Methanosalsum Methanococcoides Methanohalophilus Methanomethylovorans Methanolobus

• Family "Methanogastraceae" corrig. Chadwick et al. 2022 (ANME-2c)
  • "Candidatus Methanogaster" Chadwick et al. 2022
• 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)
  • "Candidatus Ethaniperedens" corrig. Hahn et al. 2020
• Family "Methanoperedentaceae" corrig. Haroon et al. 2013
  • "Candidatus Methanoperedens" Haroon et al. 2013 (ANME-2d, AAA)
• 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 2023
  • 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 Methanomicrobia

Order Methanomicrobiales

Phylogeny of Methanomicrobiales[8][9][10]

Methanocorpusculaceae Methanocorpusculum Methanocalculus Methanofollaceae Methanofollis Methanospirillaceae Methanosphaerula Methanolinea Methanoregula "Methanofilum" Methanospirillum Methanoculleaceae Methanoculleus Methanomicrobiaceae Methanovulcanius Methanogenium Methanoplanus Methanomicrobium Methanolacinia

• Family Methanocorpusculaceae Zellner et al. 1989
  • Methanocalculus Ollivier et al. 1998
  • Methanocorpusculum Zellner et al. 1988 ["Methanorbis" Protasov & Brune 2023]
• Family Methanofollaceae Chuvochina et al. 2024
  • Methanofollis Zellner et al. 1999
• 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
  • Methanoplanus Wildgruber et al. 1984
  • Methanovulcanius Chien et al. 2023

Class "Hikarchaeia"

Order "Hikarchaeales"

• Family "Hikarchaeaceae" Martijn et al. 2020 (MG-IV)
  •  ?"Candidatus Hikarchaeum" Martijn et al. 2020

Class "Ordosarchaeia"

Order "Ordosarchaeales"

• Family "Ordosarchaeaceae" Zhao et al. 2024
  •  ?"Candidatus Ordosarchaeum" Zhao et al. 2024

Class Halobacteria

Order Halorutilales

• Family Halorutilaceae Durán-Viseras et al. 2023
  • "Candidatus Afararchaeum" Baker et al. 2024
  • Halorutilus Durán-Viseras et al. 2023

Order Halobacteriales

Phylogeny of Halobacteriales[8][9][10]

"Chewarchaeaceae" "Candidatus Chewarchaeum" "Halalkalicoccaceae" Halalkalicoccus "Salinarchaeaceae" Salinarchaeum "Halostellaceae" Halostella Natronoarchaeaceae Natranaeroarchaeum Natronoarchaeum Natrialbaceae cont'd Haladaptataceae Halomicrococcus Haladaptatus Halorussus Halobacteriaceae Halanaeroarchaeum Halodesulfurarchaeum Halospeciosus Salarchaeum Halocalculus Halarchaeum Halobacterium Halococcaceae Halococcus Haloarculaceae Halocatena Halomarina Natronomonas Halorarius Halosegnis Salinirubellus Haloglomus Halorientalis Halapricum Halococcoides Halorhabdus Salinirussus Salinibaculum Halovenus Halosimplex Halomicrobium Haloarcula Haloferacaceae cont'd

• Halobacteriales incertae sedis
  • "Haloalcalophilium" Lizama et al. 2000a
• Family "Chewarchaeaceae" Baker et al. 2024
  • "Candidatus Chewarchaeum" Baker et al. 2024
• Family "Halalkalicoccaceae" Mao et al. 2025
  • Halalkalicoccus Xue et al. 2005
  •  ?"Natronorarus" Mao et al. 2025
• Family "Salinarchaeaceae"
  • Salinarchaeum Cui et al. 2014
• Family "Halostellaceae" Pallen, Rodriguez-R & Alikhan 2022
  • Halostella Song et al. 2016
• Family Natronoarchaeaceae Sorokin et al. 2023
  • "Natranaeroarchaeum" Sorokin et al. 2021
  • Natronoarchaeum Shimane et al. 2010

Phylogeny of Natrialbaceae[8][9][10]

Halorubellus Haloarchaeobius Halovivax "Salinilacihabitans" "Natronobeatus" Natribaculum Saliphagus Natronobiforma "Halomontanus" "Natrononativus" Natronosalvus Halostagnicola Halosolutus Halopiger goleimassiliensis Natrarchaeobaculum Salinadaptatus Natrarchaeobius Natronococcus Halopiger Halopiger djelfimassiliensis Natronobacterium Halobiforma Natronolimnobius Natrialba Natronolimnohabitans Haloterrigena Natronorubrum Natrinema

• Family Natrialbaceae Gupta et al. 2015
  • Haloarchaeobius Makhdoumi-Kakhki et al. 2012
  • Halobiforma Hezayen et al. 2002
  • "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
  • 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 Haladaptataceae Rinke et al. 2020
  • Haladaptatus Savage et al. 2007
  • Halomicrococcus Chen et al. 2020
  • Halorussus Cui et al. 2014
• Family Halococcaceae Gupta et al. 2016
  • Halococcus Schoop 1935
• Family Haloarculaceae
  • Halapricum Song et al. 2014
  • Haloarcula Torreblanca et al. 1986 [Halomicrobium Oren et al. 2002; Halosiccatus Mehrshad et al. 2016]
  • Halocatena Verma et al. 2020
  • Halococcoides Sorokin et al. 2019
  • Haloglomus Duran-Viseras, Sanchez-Porro & Ventosa 2020
  • Halomarina Inoue et al. 2011
  • Halomicroarcula Echigo et al. 2013
  • 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 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

Phylogeny of Haloferacaceae[8][9][10]

Salinirubrum Haloplanus Halobium Halegenticoccus Halogranum Haloprofundus Salinigranum Haloferax Halopelagius Halogeometricum Haloquadratum Halobellus Halalkalirubrum Natronocalculus Halohasta Halonotius Halolamina Halorarum Halobaculum Halalkaliarchaeum Halopenitus Haloparvum Halorubrum

• 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 ["Candidatus Halobonum" Ugalde et al. 2013]
  • Halobellus Cui et al. 2011
  • Halobium Mori et al. 2016
  • 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
  • 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
  • Halorubrum McGenity & Grant 1996 [Halorubrobacterium Kamekura & Dyall-Smith 1996]
  • Natronocalculus Sorokin et al. 2023
  •  ?Salinirarus Zhang et al. 2025
  • Salinirubrum corrig. Cui & Qiu 2014
  • Salinigranum Cui & Zhang 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