Domain Bacteria Woese et al. 1990
   Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
     Class "Bacilli" Garrity et al. 2001 nom. ined. see Class Bacilli Ludwig et al. 2010
       Order Bacillales Prévot 1953 (Approved Lists 1980)
         Family Bacillaceae Fischer 1895 (Approved Lists 1980)
           Genus Amphibacillus Niimura et al. 1990
           Genus Exiguobacterium Collins et al. 1984
           Genus Gracilibacillus Wainø et al. 1999
           Genus Halobacillus Spring et al. 1996
           Genus Saccharococcus Nystrand 1984
           Genus Salibacillus Wainø et al. 1999 see Genus Virgibacillus Heyndrickx et al. 1998
           Genus Virgibacillus Heyndrickx et al. 1998
           1 Genus Bacillus Cohn 1872 (Approved Lists 1980)