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)
                     Family Planococcaceae Krasil'nikov 1949 (Approved Lists 1980)
                       Genus Kurthia Trevisan 1885 (Approved Lists 1980)
                         1 Kurthia gibsonii Shaw and Keddie 1983
                         2 Kurthia huakuii Ruan et al. 2014
                         3 Kurthia massiliensis Roux et al. 2013
                         4 Kurthia sibirica Belikova et al. 1988
                         5 Kurthia zopfiiᵀ (Kurth 1883) Trevisan 1885 (Approved Lists 1980)