Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Archaea Woese et al. 1990 [paraphyletic]
               Superphylum TACK Guy and Ettema 2011
                 Phylum Crenarchaeota Garrity and Holt 2001
                   - [Candidate class "Korarchaeota" [monotypic]] see Phylum Korarchaeota Ludwig and Klenk 2001
                   1 Class Thermoprotei Reysenbach 2002
                   1.0 [Class "Thermoprotei" Reysenbach 2001] see Class Thermoprotei Reysenbach 2002
                   n.1 [Class "Thaumarchaeota" [monotypic]] see Phylum Thaumarchaeota Brochier-Armanet et al. 2008
                   n.2 [Candidate class "Aigarchaeota" [monotypic]] see Phylum Aigarchaeota Nunoura et al. 2011