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) and National Center for Biotechnology Information (NCBI). 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. Cladogram was taken from the GTDB release 08-RS214 (28th April 2023). 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. 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 "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"

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

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

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

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"

Class "Nanohalarchaeia"

Order "Nanohalarchaeales"
 Family "Nanohalarchaeaceae"
 ? "Candidatus Nanohalarchaeum" corrig. Hamm et al. 2019
 ? "Candidatus Nanopetraeus" corrig. Crits‐Christoph et al. 2016

Class "Nanohalobiia"

Order "Nanohalobiales"
 Family "Nanoanaerosalinaceae" Zhao et al. 2022
 ? "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 Nanosalina" Narasingarao et al. 2012
 "Candidatus Nanosalinicola" corrig. Narasingarao et al. 2012

Phylum "Nanoarchaeota"

Class "Nanoarchaeia"

Nanoarchaeia incertae sedis
 "Mamarchaeales"
 "Pacearchaeales" (DHVE-5, DUSEL-1)
 "Wiannamattarchaeales" Vazquez-Campos et al. 2019 (LFWA-II, Eury4AB)
 "Woesearchaeales" (DHVE-6)
 "Jingweiarchaeales" Rao et al. 2023
 Family "Haiyanarchaeaceae" Rao et al. 2023
 ? "Candidatus Haiyanarchaeum" Rao et al. 2023
 Family "Jingweiarchaeaceae" Rao et al. 2023
 ? "Candidatus Jingweiarchaeum" Rao et al. 2023

Order "Nanoarchaeales"
 Family "Nanoarchaeaceae" Huber et al. 2011
 "Nanoarchaeum" Huber et al. 2002
 Family "Nanopusillaceae" Huber et al. 2011
 Nanobdella Kato et al. 2022
 "Candidatus Nanoclepta" St. John et al. 2019
 "Candidatus Nanopusillus" Wurch et al. 2016

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 Rehaiarchaeum" Rao et al. 2023 
 "Candidatus Acidifodinimicrobium" Luo et al. 2020 
 "Candidatus Parvarchaeum" Baker et al. 2010 (ARMAN 4 & 5)

Phylum "Asgardaeota"

Asgardaeota incertae sedis
 Class "Asgardarchaeia"
 Order "Asgardarchaeales"
 Family "Asgardarchaeaceae" Eme et al. 2023
 ? "Candidatus Asgardarchaeum" Eme et al. 2023
 Class "Balderarchaeia"
 Order "Balderarchaeales"
 Family "Balderarchaeaceae" Xie et al. 2022
 ? "Candidatus Balderarchaeum" Xie et al. 2022
 Class "Freyrarchaeia"
 Order "Freyrarchaeales"
 Family "Freyrarchaeaceae" Xie et al. 2022
 ? "Candidatus Freyrarchaeum" Xie et al. 2022

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

 Class "Njordarchaeia"
 Order "Njordarchaeales"
 Family "Njordarchaeaceae" Xie et al. 2022
 ? "Candidatus Njordarchaeum" Xie et al. 2022

 Class "Tyrarchaeia"
 Order "Tyrarchaeales"
 Family "Tyrarchaeaceae" Xie et al. 2022
 ? "Candidatus Tyrarchaeum" Xie et al. 2022

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 "Heimdallarchaeia"

Order "Gerdarchaeales"

Order "Hodarchaeales"
 Family "Hodarchaeaceae" Liu et al. 2021
 "Candidatus Hodarchaeum" Liu et al. 2021

Order "Kariarchaeales"
 Family "Kariarchaeaceae" Liu et al. 2021
 "Candidatus Kariarchaeum" Liu et al. 2021

Order "Heimdallarchaeales"
 Family "Heimdallarchaeaceae" Wu et al. 2022
 "Candidatus Heimdallarchaeum" Wu et al. 2022

Class "Jordarchaeia"

Order "Jordarchaeales"
 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 "Odinarchaeia"

Order "Odinarchaeales"
 Family "Odinarchaeaceae" Tamarit et al. 2022
 "Candidatus Odinarchaeum" Tamarit et al. 2022

Class "Hermodarchaeia"

Order "Hermodarchaeales"
 Family "Hermodarchaeaceae" corrig. Liu et al. 2021
 "Candidatus Hermodarchaeum" corrig. Liu et al. 2021

Class "Lokiarchaeia"

Order "Helarchaeales"

Order "Sigynarchaeales"
 Family "Sigynarchaeaceae" Xie et al. 2022
 ? "Candidatus Sigynarchaeum" Xie et al. 2022

Order "Lokiarchaeales"
In GTDB as order CR-4
 Family "Lokiarchaeaceae" Vanwonterghem et al. 2016
 ? "Candidatus Lokiarchaeum" corrig. Spang et al. 2015 (MBGB, DSAG)
 Family  "Prometheoarchaeaceae" Pallen, Rodriguez-R & Alikhan 2022 ("MK-D1")
 ? "Candidatus Harpocratesius" Wu et al. 2022
 "Candidatus Promethearchaeum" corrig. Imachi, Nobu & Takai 2020

Phylum "Thermoproteota"

Thermoproteota Incertae sedis
 "Candidatus Pyrohabitans" Adam et al. 2022
 "Brockarchaeia"

Class "Korarchaeia"

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

Class "Bathyarchaeia"

Order "Hecatellales"
 Family "Hecatellaceae" Rinke et al. 2020
 ? "Candidatus Hecatella" Adam et al. 2022

MCG6
 ? "Candidatus Termiticorpusculum" Loh, Herve & Brune 2021
 ? "Candidatus Termitimicrobium" Loh, Herve & Brune 2021

Class Nitrososphaeria_A

Order "Caldarchaeales"

 Family "Caldarchaeaceae" Rinke et al. 2020
 ? "Candidatus Caldarchaeum" corrig. Nunoura et al. 2011 (HWCGI)
 "Candidatus Calditenuis" corrig. Beam et al. 2016

 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 "Geothermarchaeales"
 Family "Geothermarchaeaceae" Adam et al. 2022
 ? "Candidatus Geothermarchaeum" Adam et al. 2022
 ? "Candidatus Scotarchaeum" Adam et al. 2022

Order "Conexivisphaerales"
 Family "Conexivisphaeraceae" Kato et al. 2021 (THSC Group)
 Conexivisphaera Kato et al. 2021

Order Nitrososphaerales

 Family "Methylarchaceae" Hua et al. 2019
 ? "Candidatus Methylarchaeum" Hua et al. 2019
 ? "Candidatus Methanotowutia" Ou et al. 2022
 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
 ? "Candidatus Nitrosospongia" Moeller et al. 2019
 "Cenarchaeum" DeLong & Preston 1996
 Nitrosarchaeum corrig. Jung et al. 2018
 "Candidatus Nitrosopelagicus" Santoro et al. 2015
 Nitrosopumilus Qin et al. 2017
 "Candidatus Nitrosotalea" Lehtovirta 2011
 "Candidatus Nitrosotenuis" Lebedeva et al. 2013

Class "Culexarchaeia"

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

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 "Methanomethylicales"
 Family "Candidatus Methanomethylicaceae" corrig. Vanwonterghem et al. 2016
 "Candidatus Methanomethylicus" Vanwonterghem et al. 2016
 "Candidatus Methanosuratinicola" corrig. Vanwonterghem et al. 2016

Class Thermoproteia

Order "Gearchaeales"

Order Thermofilales
 Family Thermofilaceae Burggraf, Huber & Stetter 1997
 Infirmifilum Zayulina et al. 2021
 Thermofilum Zillig & Gierl 1983

Order Thermoproteales

 Family Thermoproteaceae Zillig & Stetter 1982
 Pyrobaculum Huber, Kristjansson & Stetter 1988
 Thermoproteus Zillig & Stetter 1982
 Family "Thermocladiaceae" Rinke et al. 2020
 Caldivirga Itoh et al. 1999
 Thermocladium Itoh, Suzuki & Nakase 1998
 Vulcanisaeta Itoh, Suzuki & Nakase 2002

Class "Sulfolobia"

Order "Marsarchaeales"

Order Sulfolobales

 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
 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
 Pyrolobus Blochl et al. 1999
 Family "Ignicoccaceae" Rinke et al. 2020
 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
 ?Stetteria Jochimsen, Peinemann-Simon & Thomm 1998
 ?Thermodiscus Stetter 2003
 Family "Ignisphaeraceae" Rinke et al. 2020
 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
 "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 "Hadarchaeaceae" Chuvochina et al. 2019
 ? "Candidatus Hadesarchaeum" Hua et al. 2019
 ? "Candidatus Methanourarchaeum" Hua et al. 2019
 "Candidatus Hadarchaeum" Chuvochina et al. 2019

Phylum Methanobacteriota_B

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 "Hydrothermarchaeaceae" Chuvochina et al. 2019
 "Candidatus Hydrothermarchaeum" Chuvochina et al. 2019

Phylum "Methanobacteriota"

Class Methanopyri

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

Class Methanococci

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

Class Methanobacteria

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" Rinke et al. 2020
 Methanothermobacter Wasserfallen et al. 2000
 Family Methanobacteriaceae Barker 1956
 Methanobacterium Kluyver & van Niel 1936
 Methanobrevibacter Balch & Wolfe 1981
 Methanosphaera Miller & Wolin 1985

Phylum "Thermoplasmatota"

Thermoplasmatota incertae sedis

Order "Yaplasmatales"

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 "Natronoplasmatales"

 Family "Natronoplasmataceae" Pallen, Rodriguez-R & Alikhan 2022 (PWKY01)
 "Candidatus Haladaptoplasma" Zhou et al. 2022
 ? "Candidatus Haloplasma" Zhou et al. 2022 non Antunes et al. 2008
 "Candidatus Natronoplasma" Zhou et al. 2022
 "Candidatus Saliniplasma" Zhou et al. 2022

Order "Proteinoplasmatales"
 (SG8-5)

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

 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
 "Candidatus Methanarcanum" Chibani et al. 2022
 "Candidatus Methanogranum" corrig. Iino et al. 2013
 "Candidatus Methanomethylophilus" corrig. Borrel et al. 2012
 "Candidatus Methanoplasma" corrig. Lang et al. 2015
 ? "Candidatus Methanospyradousia" Gilroy et al. 2021

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

Order Thermoplasmatales

 Family Thermoplasmataceae Reysenbach 2002
 Acidiplasma Golyshina et al. 2009
 Cuniculiplasma corrig. Golyshina et al. 2016
 Ferroplasma Golyshina et al. 2000
 Picrophilus Schleper et al. 1996
 ? "Candidatus Scheffleriplasma" Krause et al. 2022
 Thermogymnomonas Itoh, Yoshikawa & Takashina 2007
 Thermoplasma Darland et al. 1970

Phylum "Halobacteriota"

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 Archaeoglobi

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
 Family Archaeoglobaceae Huber & Stetter 2002
 ? "Candidatus Methanomixotrophus" corrig. Liu et al. 2021
 ? "Candidatus Methanoproducendum" Hua et al. 2019
 Archaeoglobus Stetter 1988
 Ferroglobus Hafenbradl et al. 1997
 Geoglobus Kashefi et al. 2002

Class "Methanoliparia"

Order "Methanoliparales"
 Family "Methanoliparaceae" Borrel et al. 2019
 "Candidatus Methanoliparum" Borrel et al. 2019
 "Candidatus Methanolliviera" Borrel et al. 2019

Class "Syntropharchaeia"

Order "Methanophagales"
 Family ? "Veteromethanophagaceae" Vulcano et al. 2022
 Family "Methanophagaceae" Chadwick et al. 2022
 ? "Candidatus Methanophaga" Chadwick et al. 2022
 ? "Candidatus Methanoalium" Chadwick et al. 2022
 Family "Methanoxibalbaceae" Laso-Pérez et al. 2022
 ? "Candidatus Methanoxibalbensis" Laso-Pérez et al. 2022
 ? "Candidatus Methanospirare" Laso-Pérez et al. 2022

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

Class "Methanocellia"

Order Methanocellales
 Family Methanocellaceae Sakai et al. 2008
 Methanocella Sakai et al. 2008

Class "Methanosarcinia"

Order "Methanotrichales"
 Family Methanotrichaceae Akinyemi et al. 2021
 Methanothrix Huser, Wuhrmann & Zehnder 1983

Order Methanosarcinales

 Family "Methanocomedenaceae" 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 Argarchaeum" corrig. Chen et al. 2019 (GOM arc I)
 "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
 Methanohalobium Zhilina & Zavarzin 1988
 Methanohalophilus Paterek & Smith 1988
 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 Methanosarcinia A

Order Methanosarcinales_A
 Family Methermicoccaceae Cheng et al. 2007
 Methermicoccus Cheng et al. 2007

Class Methanomicrobia

Order "Alkanophagales"
 Family Alkanophagaceae 
 ? "Candidatus Alkanophaga" Zehnle et al. 2023

Order Methanomicrobiales

 Family Methanocorpusculaceae Zellner et al. 1989
 Methanocalculus Ollivier et al. 1998 
 Methanocorpusculum Zellner et al. 1988
 Family "Methanofollaceae" 
 Methanofollis Zellner et al. 1999
 Family "Methanosphaerulaceae" Rinke et al. 2020
 Methanosphaerula Cadillo-Quiroz et al. 2009
 Family Methanospirillaceae Boone et al. 2002
 Methanospirillum Ferry, Smith & Wolfe 1974
 Family Methanoregulaceae Sakai et al. 2012
 Methanolinea Imachi et al. 2008
 Methanoregula Brauer et al. 2011
 Family "Methanoculleaceae" Rinke et al. 2020
 Methanoculleus Maestrojun et al. 1990
 Family Methanomicrobiaceae Balch & Wolfe 1981
 Methanogenium Romesser et al. 1981
 Methanolacinia Zellner et al. 1990
 Methanomicrobium Balch & Wolfe 1981
 Methanoplanus Wildgruber et al. 1984

Class "Hikarchaeia"

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

Class "Methanonatronarchaeia"

Order "Methanonatronarchaeales"
 Family Methanonatronarchaeaceae Sorokin et al. 2018
 "Candidatus Methanohalarchaeum" Sorokin et al. 2018
 Methanonatronarchaeum Sorokin et al. 2018

Class Halobacteria

Order "Halorutilales"
 Family "Halorutilaceae" Durán-Viseras et al. 2023
 ? "Candidatus Halorutilus" Durán-Viseras et al. 2023

Order Halobacteriales
 Halobacteriales incertae sedis
 "Haloalcalophilium" Lizama et al. 2000a
 Family "Haladaptaceae" Rinke et al. 2020
 Haladaptatus Savage et al. 2007
 ?Halomicrococcus Chen et al. 2020
 Halorussus Cui et al. 2014
 Family Halobacteriaceae 
 ? "Actinoarchaeum" Tang et al. 2023
 Halanaeroarchaeum Sorokin et al. 2016
 Halarchaeum Minegishi et al. 2010
 Halobacterium Elazari-Volcani 1957
 Halocalculus Minegishi et al. 2015
 Halodesulfurarchaeum Sorokin et al. 2017
 ?Sala Song et al. 2022
 Salarchaeum Shimane et al. 2011
 Family "Salinarchaeaceae" 
 Salinarchaeum Cui et al. 2014
 Family "Halostellaceae" Pallen, Rodriguez-R & Alikhan 2022
 Halostella Song et al. 2016
 Family "Natronoarchaeaceae" Sorokin et al. 2022
 ? "Natranaeroarchaeum" Sorokin et al. 2021
 Natronoarchaeum Shimane et al. 2010

 Family Natrialbaceae Gupta et al. 2015
 Haloarchaeobius Makhdoumi-Kakhki et al. 2012
 Halobiforma Hezayen et al. 2002
 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
 Halovarius Mehrshad et al. 2015
 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 
 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
 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
 Haloarcula Torreblanca et al. 1986
 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
 Halomicrobium Oren et al. 2002
 Halorientalis Cui et al. 2011
 ? "Halorarius" Sun et al. 2023
 Halorhabdus Waino et al. 2000
 ?Halosegnis Duran-Viseras et al. 2022
 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 "Halalkalicoccaceae" 
 Halalkalicoccus Xue et al. 2005

 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. 2019
 Halobaculum Oren et al. 1995
 Halobellus Cui et al. 2011
 ?Halobium Mori et al. 2016
 Haloferax Torreblanca et al. 1986
 Halogeometricum Montalvo-Rodriguez et al. 1998 (Halosarcina)
 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
 "Natronocalculus" Sorokin et al. 2022
 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

References 

 
Archaea