prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Archaea" Woese et al. 1990 stat. inval. see Domain Archaea Woese et al. 2024
     Phylum "Euryarchaeota" Garrity and Holt 2002 stat. inval. see Kingdom Methanobacteriati (Garrity and Holt 2023) Oren and Göker 2024
       Class "Methanomicrobia" Garrity et al. 2005 nom. inval.
         Order Methanosarcinales Boone et al. 2002
           1 Family Methanosaetaceae Boone et al. 2002 nom. illeg. [monotypic] see Family Methanotrichaceae Akinyemi et al. 2021
           2 Family Methanosarcinaceae Balch and Wolfe 1981
           3 Family Methermicoccaceae Cheng et al. 2007 [monotypic]