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 Bacteroidota Krieg et al. 2021
                 Class Sphingobacteriia Kämpfer 2012 [monotypic]
                   Order Sphingobacterialesᵀ Kämpfer 2012
                     1 Genus "Candidatus Cardinium" Zchori-Fein et al. 2004, incertae sedis [monotypic]
                     2 Genus "Candidatus Paenicardinium" Noel and Atibalentja 2006, incertae sedis
                     3 Family Aurantibacillaceae Vieira et al. 2023 [monotypic]
                     4 Family Filobacteriaceae Ike et al. 2016 [monotypic]
                     5 Family Sphingobacteriaceaeᵀ Steyn et al. 1998