procaryotes
   Domain Bacteria Woese et al. 1990
     Phylum "Deinococcus-Thermus"
       Class Deinococci Garrity and Holt 2001 nom. inval. see Class Deinococci Garrity and Holt 2002
         Order Thermales Rainey and Da Costa 2001 see Order Thermales Rainey and Da Costa 2002
           Family Thermaceae Da Costa and Rainey 2001 see Family Thermaceae Da Costa and Rainey 2002
             Genus Thermus Brock and Freeze 1969 (Approved Lists 1980)