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 "Proteobacteria" Craig et al. 2010
               Phylum "Gammaproteobacteria" Garrity et al., 2005 [monotypic]
                 Class Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Thiotrichales Garrity et al. 2005
                     Family Piscirickettsiaceae Fryer and Lannan 2005
                       Genus Thioalkalimicrobium Sorokin et al. 2001
                         1 Thioalkalimicrobium aerophilum Sorokin et al. 2001
                         2 Thioalkalimicrobium cyclicum Sorokin et al. 2002
                         3 Thioalkalimicrobium microaerophilum Sorokin et al. 2007
                         4 Thioalkalimicrobium sibiricum corrig. Sorokin et al. 2001