[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Gammaproteobacteria 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 popilliae (Dutky and Gooden 1952) Philip 1956 (Approved Lists 1980)
               2 Rickettsiella chironomi (ex Weiser 1963) Weiss et al. 1984
               3 Rickettsiella grylli (ex Vago and Martoja 1963) Weiss et al. 1984
               4 Rickettsiella stethorae Hall and Badgley 1957 (Approved Lists 1980)