life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokarya see Domain Bacteria Woese et al. 1990
     Kingdom Bacteria (Cohn 1870) Cavalier-Smith 1983 - bacteria see Kingdom Bacteria Cavalier-Smith 2002
       Subkingdom Eubacteria Cavalier-Smith 1981 see Domain Bacteria Woese et al. 1990
         Division Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980) - gram-positive bacteria see Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
           Phylum Thermotogae Margulis and Schwartz 1998 - thermophilic fermenters see Phylum Thermotogae Reysenbach 2001
             1 Genus Aquifex Huber and Stetter 1992
             2 Genus Fervidobacterium Patel et al. 1985
             3 Genus Thermosipho Huber et al. 1989
             4 Genus Thermotoga Stetter and Huber 1986