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 Methanomethylophilaceae Borrel et al. 2024
                         1 Genus "Candidatus Methanarcanum" Chibani et al. 2022 nom. pro-inval.
                         2 Genus "Candidatus Methanomicula" Protasov and Brune 2023 nom. pro-inval.
                         3 Genus "Candidatus Methanoprimaticola" Chibani et al. 2022 nom. pro-inval.
                         4 Genus "Candidatus Methanospyradousia" Gilroy et al. 2022
                         5 Genus Methanomethylophilusᵀ Borrel et al. 2024