[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   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 Exiguobacterium Collins et al. 1984
               1 Exiguobacterium aurantiacum Collins et al. 1984
               2 Exiguobacterium acetylicum (Levine and Soppeland 1926) Farrow et al. 1994
               3 Exiguobacterium aestuarii Kim et al. 2005
               4 Exiguobacterium antarcticum Frühling et al. 2002
               5 Exiguobacterium artemiae López-Cortés et al. 2006
               6 Exiguobacterium marinum Kim et al. 2005
               7 Exiguobacterium mexicanum López-Cortés et al. 2006
               8 Exiguobacterium oxidotolerans Yumoto et al. 2004
               9 Exiguobacterium undae Frühling et al. 2002