[living organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryota
     Kingdom Archaea Woese et al. 1990 see Domain Archaea Woese et al. 1990
       Phylum Crenarchaeota Garrity and Holt 2001
         Class "Aigarchaeota" [monotypic] see Phylum Aigarchaeota Nunoura et al. 2011
           Candidatus "Caldiarchaeum" Nunoura et al. 2011