Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Pseudomonadotaᵀ Garrity et al. 2021
                 Class Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Legionellales Garrity et al. 2005
                     Family Coxiellaceae Garrity et al. 2005
                       01 Genus Aquicella Santos et al. 2004
                       02 Genus Coxiellaᵀ (Philip 1943) Philip 1948 (Approved Lists 1980) [monotypic]
                       03 Genus Rickettsiella Philip 1956 (Approved Lists 1980)
                       04 Genus "Candidatus Aquirickettsiella" Bojko et al. 2020
                       05 Genus "Candidatus Berkiella" Mehari et al. 2016
                       06 Genus "Candidatus Cochliopodiiphilus" corrig. Tsao et al. 2020
                       07 Genus "Candidatus Nucleiphilum" corrig. Schulz et al. 2020
                       08 Genus "Candidatus Occultibacter" corrig. Schulz et al. 2020
                       09 Genus "Candidatus Fiscibacter" Solbach et al. 2021 nom. pro-inval.
                       10 Genus "Candidatus Pokemonas" Solbach et al. 2021 nom. pro-inval.