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
                       1 Genus "Candidatus Methanoplasma" Lang et al. 2020
                       2 Family "Candidatus Methanomixtatrophicaceae" Hua et al. 2019 nom. pro-inval. [monotypic]
                       3 Family Methanomassiliicoccaceaeᵀ Iino et al. 2013
                       4 Family Methanomethylophilaceae Borrel et al. 2024