[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain "Archaea" Woese et al. 1990
     Phylum "Euryarchaeota" Garrity and Holt 2001
       Class "Methanomicrobia"
         Order Methanosarcinales Boone et al. 2002
           Family Methanosaetaceae Boone et al. 2002 nom. illeg.
             Genus Methanothrix Huser et al. 1983
               Methanothrix thermophila Kamagata et al. 1992 see Methanothrix thermoacetophila corrig. Nozhevnikova and Chudina 1988