Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Archaea Woese et al. 2024 [paraphyletic]
               Kingdom Methanobacteriati (Garrity and Holt 2023) Oren and Göker 2024
                 Phylum Methanobacteriotaᵀ Garrity and Holt 2023
                   Class Thermoplasmata Reysenbach 2002
                     Order Methanomassiliicoccales Iino et al. 2013
                       Family "Candidatus Methanomixtatrophicaceae" Hua et al. 2019 nom. pro-inval. [monotypic]
                         Genus "Candidatus Methanomixtatrophicum"ᵀ Hua et al. 2019 nom. pro-inval.