Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
                 Class Bacilli Ludwig et al. 2010
                   Order Bacillalesᵀ Prévot 1953 (Approved Lists 1980)
                     01 Genus Chungangia Kim et al. 2012, incertae sedis [monotypic]
                     02 Genus Desulfuribacillus Sorokin et al. 2014, incertae sedis [monotypic]
                     03 Genus Exiguobacterium Collins et al. 1984, incertae sedis
                     04 Genus Gemella Berger 1960 (Approved Lists 1980), incertae sedis
                     05 Genus Geomicrobium Echigo et al. 2010, incertae sedis
                     06 Genus Rummeliibacillus Vaishampayan et al. 2009, incertae sedis
                     07 Genus Solibacillus Krishnamurthi et al. 2009, incertae sedis [monotypic]
                     08 Genus Thermicanus Gößner et al. 2000, incertae sedis [monotypic]
                     09.1 Family Bacillaceaeᵀ Fischer 1895 (Approved Lists 1980)
                     09.2 Family Planococcaceae Krasil'nikov 1949 (Approved Lists 1980)
                     12 Family Listeriaceae Ludwig et al. 2010
                     13 Family Staphylococcaceae Schleifer and Bell 2010
                     14 Family Sporolactobacillaceae Ludwig et al. 2010
                     15 Family Paenibacillaceae De Vos et al. 2010
                     16.1 Family Pasteuriaceae Laurent 1890 (Approved Lists 1980) [monotypic]
                     16.2 Family Alicyclobacillaceae da Costa and Rainey 2010
                     17 Family Thermoactinomycetaceae Matsuo et al. 2006