list of archaea genera 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 07-rs207 (8 april 2022). 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. archaea "dpann" "altarchaeota" "iainarchaeota" "micrarchaeota" "undinarchaeota" "huberarchaeaota" "aenigmarchaeota" "nanohalarchaeota" "nanoarchaeota" "proteoarchaeota" "asgardaeota" "thermoproteota" "euryarchaeida" "hadarchaeota" methanobacteriota_b (incl. "thermococci") "methanomada" methanobacteriota_a (incl. "methanococci" & "methanopyri") "hydrothermarchaeota" "methanobacteriota" "neoeuryarchaeota" "thermoplasmatota" "halobacteriota" (class ii methanogens) phylum "altarchaeota" order "altarchaeales" family "altarchaeaceae" corrig. probst et al. 2014 "candidatus altarchaeum" corrig. probst et al. 2014 phylum "iainarchaeota" 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 "norongarragalinales" "ca. norongarragalina" "micrarchaeales" "ca. mancarchaeum" "ca. micrarchaeum" "burarchaeales" "ca. burarchaeum" "fermentimicrarchaeales" "ca. fermentimicrarchaeum" "gugararchaeales" "ca. gugararchaeum" "anstonellales" "anstonellaceae" "ca. anstonella" "bilamarchaeaceae" "ca. bilamarchaeum" 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 "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 order "gugararchaeales" family "gugararchaeaceae" vázquez-campos et al. 2021 "candidatus gugararchaeum" vázquez-campos et al. 2021 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 phylum "undinarchaeota" 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" order "huberarchaeales" family "huberarchaeaceae" rinke et al. 2020 "candidatus huberarchaeum" corrig. schwank et al. 2019 phylum "aenigmatarchaeota" order "aenigmatarchaeales" family "aenigmatarchaeaceae" corrig. rinke et al. 2020 "candidatus aenigmatarchaeum" corrig. rinke et al. 2013 phylum "nanohalarchaeota" phylogeny of nanohalobiaceae "candidatus nanosalinicola" "candidatus nanosalina" "candidatus nanohalobium" order "nanohalarchaeales" family "nanohalarchaeaceae" ?"candidatus nanohalarchaeum" corrig. hamm et al. 2019 ?"candidatus nanopetraeus" corrig. crits‐christoph et al. 2016 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" phylogeny of "nanoarchaeota" "nanoarchaeia" "nanoarchaeales" "nanoarchaeaceae" "nanoarchaeum" "nanopusillaceae" "ca. nanoclepta" "ca. nanopusillus" "pacearchaeales" "woesearchaeales" "tiddalikarchaeales" "ca. tiddalikarchaeum" "parvarchaeales" "ca. parvarchaeum" order nanobdellales family nanobdellaceae kato et al. 2022 ?nanobdella kato et al. 2022 nanoarchaeia incertae sedis "mamarchaeales" "pacearchaeales" (dhve-5, dusel-1) "wiannamattarchaeales" vazquez-campos et al. 2019 (lfwa-ii, eury4ab) "woesearchaeales" (dhve-6) order "jingweiarchaeales" 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 "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" ?"candidatus rehaiarchaeum" rao et al. 2023 family "acidifodinimicrobiaceae" luo et al. 2020 ?"candidatus acidifodinimicrobium" luo et al. 2020 family "parvarchaeaceae" rinke et al. 2020 "candidatus parvarchaeum" baker et al. 2010 (arman 4 & 5) phylum "asgardaeota" phylogeny of asgardaeota "sifarchaeia" "borrarchaeales" "sifarchaeales" "wukongarchaeia" "wukongarchaeales" "heimdallarchaeia" "hodarchaeales" "gerdarchaeales" "kariarchaeales" "heimdallarchaeales" "jordarchaeia" "jordarchaeales" "odinarchaeia" "odinarchaeales" "baldrarchaeia" "baldrarchaeales" "thorarchaeia" "thorarchaeales" "hermodarchaeia" "hermodarchaeales" "lokiarchaeia" "helarchaeales" "lokiarchaeales" order "njordarchaeales" family "njordarchaeaceae" xie et al. 2022 ?"candidatus njordarchaeum" xie et al. 2022 order "tyrarchaeales" family "tyrarchaeaceae" xie et al. 2022 ?"candidatus tyrarchaeum" xie et al. 2022 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 order "wukongarchaeales" family "wukongarchaeaceae" liu et al. 2021 "candidatus wukongarchaeum" liu et al. 2021 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 order "freyrarchaeales" family "freyrarchaeaceae" xie et al. 2022 ?"candidatus freyrarchaeum" xie et al. 2022 order "jordarchaeales" family "jordarchaeaceae" sun et al. 2021 "candidatus jordarchaeum" sun et al. 2021 order "odinarchaeales" family "odinarchaeaceae" tamarit et al. 2022 "candidatus odinarchaeum" tamarit et al. 2022 order "baldrarchaeales" family "baldrarchaeaceae" corrig. liu et al. 2021 "candidatus baldrarchaeum" corrig. liu et al. 2021 order "thorarchaeales" family "thorarchaeaceae" (mbg-b) order "hermodarchaeales" family "hermodarchaeaceae" corrig. liu et al. 2021 "candidatus hermodarchaeum" corrig. liu et al. 2021 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" phylogeny of thermoproteota "korarchaeia" "korarchaeales" "bathyarchaeia" nitrososphaeria_a "caldarchaeales" nitrososphaeria "geothermarchaeales" conexivisphaerales nitrososphaerales "sulfobacteria" "methanomethylicia" "methanomethylicales" "thermoproteia" "gearchaeales" "thermofilales" thermoproteales "marsarchaeales" sulfolobales thermoproteota incertae sedis "candidatus pyrohabitans" adam et al. 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 "brockarchaeia" order "korarchaeales" family "korarchaeaceae" rinke et al. 2020 "candidatus korarchaeum" elkins et al. 2008 "candidatus methanodesulfokora" mckay et al. 2019 bathyarchaeia incertae sedis "candidatus termiticorpusculum" loh, herve & brune 2021 "candidatus termitimicrobium" loh, herve & brune 2021 order "hecatellales" family "hecatellaceae" rinke et al. 2020 ?"candidatus hecatella" adam et al. 2022 order "caldarchaeales" family "caldarchaeaceae" rinke et al. 2020 "candidatus caldarchaeum" corrig. nunoura et al. 2011 (hwcgi) ?"candidatus calditenuis" corrig. beam et al. 2016 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 phylogeny of nitrososphaerales "nitrosocaldaceae" "ca. nitrosocaldus" nitrososphaeraceae "ca. nitrosocosmicus" nitrososphaera nitrosopumilaceae "ca. nitrosotalea" "ca. nitrosotenuis" "ca. nitrosopelagicus" "cenarchaeum" nitrosarchaeum nitrosopumilus 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 nitrosothermus" luo et al. 2021 "candidatus nitrosocaldus" de la torre et al. 2008 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 order "culexarchaeles" family "culexarchaeaceae" kohtz et al. 2022 ?"candidatus culexarchaeum" kohtz et al. 2022 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 thermoproteia incertae sedis "gearchaeales" corrig. (nag1/ngci) "marsarchaeales" (be-d, nag2, ynpffa, ncgii) order thermofilales family thermofilaceae burggraf, huber & stetter 1997 infirmifilum zayulina et al. 2021 thermofilum zillig & gierl 1983 order thermoproteales phylogeny of thermoproteales thermoproteaceae thermoproteus pyrobaculum "thermocladiaceae" caldivirga thermocladium vulcanisaeta 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 order sulfolobales phylogeny of sulfolobales fervidicoccaceae fervidicoccus "ignicoccaceae" ignicoccus acidilobaceae ?stetteria ?thermodiscus aeropyrum caldisphaera acidilobus pyrodictiaceae pyrolobus hyperthermus pyrodictium desulfurococcaceae staphylothermus thermogladius ?sulfophobococcus thermosphaera desulfurococcus "ignisphaeraceae" ignisphaera "zestosphaeraceae" zestosphaera sulfolobaceae sulfodiicoccus sulfurisphaera stygiolobus sulfolobus sulfuracidifex saccharolobus metallosphaera acidianus brierleyi "ca. aramenus" acidianus family fervidicoccaceae perevalova et al. 2010 fervidicoccus perevalova et al. 2010 family "ignicoccaceae" rinke et al. 2020 ignicoccus huber, burggraf & stetter 2000 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 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 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 "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" 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 phylogeny of methanobacteriota_b thermococci "methanofastidiales" "ca. methanofastidiosum" "methanofastidiosaceae" thermococcales palaeococcus thermococcus species-group 3 thermococcus species-group 2 pyrococcus thermococcus thermococcaceae 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 methanobacteriota_a phylogeny of methanobacteriota_a methanopyri methanopyraceae methanopyrus methanopyrales methanococci methanocaldococcaceae methanocaldococcus methanococcaceae 'methanotorris methanofervidicoccus methanococcus aeolicus methanothermococcus okinawensis methanothermococcus methanococcus methanococcales order methanopyrales family methanopyraceae huber & stetter 2002 methanopyrus kurr et al. 1992 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 phylum "hydrothermarchaeota" order "hydrothermarchaeales" family "hydrothermarchaeaceae" chuvochina et al. 2019 "candidatus hydrothermarchaeum" chuvochina et al. 2019 phylum "methanobacteriota" phylogeny of methanobacteriota methanothermaceae methanothermus methanothermobacteraceae_a methanothermobacter species-group 2 "methanothermobacteraceae" methanothermobacter methanobacteriaceae methanobrevibacter methanobacterium species-group 2 methanosphaera methanobacterium order tepidaquicellales family "tepidaquicellaceae" corrig. kadnikov et al. 2020 "candidatus tepidaquicella" corrig. kadnikov et al. 2020 order methanobacteriales 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" phylogeny of thermoplasmatota "izemarchaea" "thermoprofundales" "pontarchaea" mgiii "poseidoniia" "poseidoniales" thermoplasmata "gimiplasmatales" methanomassiliicoccales "natronoplasmatales" (pwky01) "aciduliprofundales" "thermoplasmatales" order "thermoprofundales" (mbg-d, e2) order mgiii (mgiii high gc) (mgiii low gc) 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 order "lunaplasmatales" family "lunaplasmataceae" zinke et al. 2021 ?"candidatus lunaplasma" zinke et al. 2021 order "proteinoplasmatales" (sg8-5) order "sysuiplasmatales" family "sysuiplasmataceae" yuan