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
                     1 Genus Caedibacter (ex Preer et al. 1974) Preer and Preer 1982, incertae sedis
                     2 Genus Fangia Lau et al. 2007, incertae sedis [monotypic]
                     3 Family Thiotrichaceaeᵀ Garrity et al. 2005
                     4 Family Francisellaceae Sjöstedt 2005 [monotypic]
                     5 Family Piscirickettsiaceae Fryer and Lannan 2005