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
                 Candidate phylum Verstraetearchaeota (TMCG) Vanwonterghem et al. 2016 [monotypic]
                   Candidate class Methanomethylia Vanwonterghem et al. 2016 [monotypic]
                     Candidate order Methanomethylialesᵀ Vanwonterghem et al. 2016 [monotypic]
                       Candidate family Methanomethyliaceaeᵀ Vanwonterghem et al. 2016
                         Candidatus Methanomethylicusᵀ Vanwonterghem et al. 2016
                           1 Candidatus Methanomethylicus mesodigestumᵀ Vanwonterghem et al. 2016
                           2 Candidatus Methanomethylicus oleusabulum Vanwonterghem et al. 2016