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 Thiotrichaceaeᵀ Garrity et al. 2005
                       Genus Thiothrixᵀ Winogradsky 1888 (Approved Lists 1980)
                         Thiothrix flexilis Aruga et al. 2002