prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Deinococcus-Thermus" [monotypic]
       Class Deinococci Garrity and Holt 2002
         Order Thermales Rainey and Da Costa 2002 [monotypic]
           Family Thermaceae Da Costa and Rainey 2002
             1 Genus Marinithermus Sako et al. 2003
             2 Genus Meiothermus Nobre et al. 1996
             3 Genus Oceanithermus Miroshnichenko et al. 2003
             4 Genus Rhabdothermus Steinsbu et al. 2011
             5 Genus Thermus Brock and Freeze 1969 (Approved Lists 1980)
             6 Genus Vulcanithermus Miroshnichenko et al. 2003