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 Clostridia Rainey 2010
                   Order Clostridialesᵀ Prévot 1953 (Approved Lists 1980)
                     Family Clostridiaceaeᵀ Pribram 1933 (Approved Lists 1980)
                       Genus Alkaliphilus Takai et al. 2001
                         1 Alkaliphilus crotonatoxidans Cao et al. 2003
                         2 Alkaliphilus halophilus Wu et al. 2010
                         3 Alkaliphilus oremlandii Fisher et al. 2009
                         4 Alkaliphilus peptidifermentans corrig. Zhilina et al. 2009
                         5 Alkaliphilus transvaalensisᵀ Takai et al. 2001