List of Archaea genera

Template:Short description 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]

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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

List of Archaea genera

Phylogeny

Phylum Microcaldota

Class Microcaldia

Order Microcaldales

Phylum "Altarchaeota"

Class "Altarchaeia"

Order "Altarchaeales"

Phylum "Iainarchaeota"

Class "Iainarchaeia"

Order "Forterreales"

Order "Iainarchaeales"

Phylum "Micrarchaeota"

Class "Micrarchaeia"

Order "Norongarragalinales"

Order "Micrarchaeales"

Order "Anstonellales"

Order "Gugararchaeales"

Order "Burarchaeales"

Order "Fermentimicrarchaeales"

Phylum "Undinarchaeota"

Class "Undinarchaeia"

Order "Undinarchaeales"

Phylum "Huberarchaeaota"

Class "Huberarchaeia"

Order "Huberarchaeales"

Phylum "Aenigmatarchaeota"

Class "Aenigmatarchaeia"

Order "Aenigmatarchaeales"

Phylum "Nanohalarchaeota"

Class "Nanohalarchaeia"

Order "Nanohalarchaeales"

Order "Nanohydrothermales"

Order "Nucleotidisoterales"

Class "Nanohalobiia"

Order "Nanohalobiales"

Phylum Nanobdellota

Class Nanobdellia

Nanobdellia incertae sedis

Order JAPDLS01

Order "Jingweiarchaeales"

Order Nanobdellales

Order "Tiddalikarchaeales"

Order "Parvarchaeales"

Phylum Promethearchaeota

Promethearchaeota incertae sedis

Class "Asgardarchaeia"

Order "Asgardarchaeales"

Class "Atabeyarchaeia"

Order "Atabeyarchaeales"

Class "Sifarchaeia"

Order "Borrarchaeales"

Order "Sifarchaeales"

Class "Wukongarchaeia"

Order "Wukongarchaeales"

Class "Njordarchaeia"

Order "Njordarchaeales"

Class "Heimdallarchaeia"

Order "Hodarchaeales"

Order "Gerdarchaeales"

Order "Heimdallarchaeales"

Class "Odinarchaeia"

Order "Odinarchaeales"

Class "Jordarchaeia"

Order "Jordarchaeales"

Class "Baldrarchaeia"

Order "Baldrarchaeales"

Class "Thorarchaeia"

Order "Thorarchaeales"

Class "Hermodarchaeia"

Order "Hermodarchaeales"

Class Promethearchaeia

Order "Helarchaeales"

Order Promethearchaeales

Phylum "Korarchaeota"

Class "Korarchaeia"

Order "Korarchaeales"

Phylum Thermoproteota

Thermoproteota Incertae sedis

Class "Bathyarchaeia"