procaryotes
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Firmicutes (Gibbons and Murray 1978) Garrity and Holt 2001 stat. inval. see Phylum Bacillota Gibbons and Murray 2021
       Class "Bacilli" "Garrity and Holt 2001" nom. nud. see Class Bacilli Ludwig et al. 2010
         Order Bacillales Prévot 1953 (Approved Lists 1980) see Order Caryophanales Peshkoff 1939 (Approved Lists 1980)
           Family Bacillaceae Fischer 1895 (Approved Lists 1980)
             Genus Exiguobacterium Collins et al. 1984