Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum Fibrobacteres-Chlorobi-Bacteroidetes (FCB) Gupta 2004
               Phylum Bacteroidetes Krieg et al. 2012
                 Class Bacteroidiaᵀ Krieg 2012 [monotypic]
                   Order Bacteroidalesᵀ Krieg 2012
                     1 Genus Phocaeicola Al Masalma et al. 2009, incertae sedis [monotypic]
                     2.1 Family Marinifilaceae Iino et al. 2014 [monotypic]
                     2.2 Family Prolixibacteraceae Huang et al. 2014
                     3 Family Bacteroidaceaeᵀ Pribram 1933 (Approved Lists 1980)
                     4.1 Family Rikenellaceae Krieg et al. 2012
                     4.2 Family Marinilabiliaceae Ludwig et al. 2012
                     5 Family Porphyromonadaceae Krieg 2012
                     6 Family Prevotellaceae Krieg 2012