Proteoarchaeota is a proposed archaeal clade thought to be closely related and possibly ancestral to the Eukaryotes.

[2][3][a] The phylogenetic relationship of this group is still under discussion.

The relationship of the members is approximately as follows:[4][5][6][7] "Korarchaeota" Thermoproteota "Aigarchaeota" "Geoarchaeota" "Nitrososphaerota" "Bathyarchaeota" "Lokiarchaeota" "Odinarchaeota" "Thorarchaeota" "Heimdallarchaeota" Eukaryota

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