proteoarchaeota proteoarchaeota "proteoarchaeota" are a proposed archaeal kingdom thought to be closely related to the eukaryotes. proteoarchaeota archaea sulfolobus infected with specific virus stsv-1 scientific classification domain: archaea kingdom: proteoarchaeotapetitjean et al. 2014 superphyla and phyla tack superphylum "aigarchaeota" "bathyarchaeota" thermoproteota "geoarchaeota" "korarchaeota" nitrososphaerota "verstraetearchaeota" asgard superphylum "heimdallarchaeota" "lokiarchaeota" "odinarchaeota" "thorarchaeota" synonyms crenarchaeida luketa 2012 crenarchaeota woese, kandler & wheelis 1990 classification the phylogenetic relationship of this group is still under discussion. the relationship of the members is approximately as follows: proteoarchaeota tack / "korarchaeota" thermoproteota "aigarchaeota" "geoarchaeota" nitrososphaerota "bathyarchaeota" eocyta asgard / "lokiarchaeota" "odinarchaeota" "thorarchaeota" "heimdallarchaeota" (+ α-proteobacteria) eukaryota "eukaryomorpha" notes approximately the same group is sometimes referred to as tack after the initial letters of its early-found daughter clades: thaumarchaeota (now nitrososphaerota), "aigarchaeota", crenarchaeota (now thermoproteota), and "korarchaeota". because of the unsettled phylogeny of the group, the names "proteoarchaeota" and tack may become distinct after further re-organization.