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