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
                       Genus Rickettsiella Philip 1956 (Approved Lists 1980)
                         1 Rickettsiella chironomi (ex Weiser 1963) Weiss et al. 1984
                         2 Rickettsiella grylli (ex Vago and Martoja 1963) Weiss et al. 1984
                         3 Rickettsiella popilliaeᵀ (Dutky and Gooden 1952) Philip 1956 (Approved Lists 1980)
                         4 Rickettsiella stethorae Hall and Badgley 1957 (Approved Lists 1980)