Kingdom Bacteria Cavalier-Smith 2002 - bacteria see Domain Bacteria Woese et al. 1990
   Subkingdom Negibacteria Cavalier-Smith 2002 - negibacteria see Domain Bacteria Woese et al. 1990
     Infrakingdom Eobacteria Cavalier-Smith 2002 see Domain Bacteria Woese et al. 1990
       Division Eobacteria Cavalier-Smith 2002
         Class Hadobacteria Cavalier-Smith 2002
           1 Genus Deinococcus Brooks and Murray 1981
           2 Genus Thermus Brock and Freeze 1969 (Approved Lists 1980)
           3 Genus Meiothermus Nobre et al. 1996
           4 Order Thermales Rainey and Da Costa 2001 see Order Thermales Rainey and Da Costa 2002