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 Alphaproteobacteria Garrity et al. 2006
                   Order Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980)
                     1 Genus Symbiotes Philip 1956 (Approved Lists 1980), incertae sedis [monotypic]
                     2 Genus "Candidatus Anadelfobacter" Vannini et al. 2020, incertae sedis
                     3 Genus "Candidatus Repentibacter" corrig. Prokopchuk et al. 2021, incertae sedis
                     4 Family Ehrlichiaceae Moshkovski 1945 (Approved Lists 1980)
                     5 Family Rickettsiaceae Pinkerton 1936 (Approved Lists 1980)
                     6 Family "Candidatus Deianiraeaceae" Castelli et al. 2021 [monotypic]
                     7 Family "Candidatus Midichloriaceae" Montagna et al. 2020
                     8 Family "Candidatus Tenuibacteraceae" Kroer et al. 2020 [monotypic]
                     9 Family "Candidatus Arcanibacteraceae" Chuvochina et al. 2023 nom. pro-inval. [monotypic]