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 Bacteroidiaᵀ Krieg 2012 [monotypic]
                   Order Bacteroidalesᵀ Krieg 2012
                     01 Genus "Candidatus Alcium" Solden et al. 2020, incertae sedis
                     02 Genus "Candidatus Armantifilum" Desai et al. 2020, incertae sedis
                     03 Genus "Candidatus Caccoplasma" Gilroy et al. 2022, incertae sedis
                     04 Genus "Candidatus Coprenecus" Gilroy et al. 2022, incertae sedis
                     05 Genus "Candidatus Cryptobacteroides" Gilroy et al. 2022, incertae sedis
                     06 Genus "Candidatus Egerieousia" Gilroy et al. 2022, incertae sedis
                     07 Genus "Candidatus Hemicellulosilyticus" corrig. Solden et al. 2020, incertae sedis
                     08 Genus "Candidatus Limimorpha" Gilroy et al. 2022, incertae sedis
                     09 Genus "Candidatus Merdivivens" Gilroy et al. 2022, incertae sedis
                     10 Genus "Candidatus Onthomorpha" Gilroy et al. 2022, incertae sedis
                     11 Genus "Candidatus Paraporphyromonas" Naas et al. 2020, incertae sedis
                     12 Genus "Candidatus Pullibacteroides" Gilroy et al. 2022, incertae sedis
                     13 Genus "Candidatus Tammella" Hongoh et al. 2020, incertae sedis
                     14 Genus "Candidatus Vestibaculum" Stingl et al. 2020, incertae sedis
                     15 Genus "Candidatus Cacconaster" Gilroy et al. 2022 nom. pro-inval., incertae sedis
                     16 Genus "Candidatus Colimorpha" Gilroy et al. 2022 nom. pro-inval., incertae sedis
                     17 Genus "Candidatus Equibacterium" Gilroy et al. 2022 nom. pro-inval., incertae sedis
                     18 Genus "Candidatus Hennigimonas" Gilroy et al. 2022 nom. pro-inval., incertae sedis
                     19 Genus "Candidatus Liminaster" Gilroy et al. 2022 nom. pro-inval., incertae sedis
                     20 Genus "Candidatus Minthomonas" Gilroy et al. 2022 nom. pro-inval., incertae sedis
                     21 Family Bacteroidaceaeᵀ Pribram 1933 (Approved Lists 1980)
                     22 Family Balneicellaceae Fadhlaoui et al. 2016 [monotypic]
                     23 Family Barnesiellaceae García-López et al. 2020
                     24 Family Dysgonomonadaceae García-López et al. 2020
                     25 Family Lentimicrobiaceae Sun et al. 2016 [monotypic]
                     26 Family Marinifilaceae Iino et al. 2014
                     27 Family Marinilabiliaceae Ludwig et al. 2012
                     28 Family Muribaculaceae Lagkouvardos et al. 2019
                     29 Family Odoribacteraceae Munoz et al. 2016
                     30 Family Paludibacteraceae Ormerod et al. 2022
                     31 Family Porphyromonadaceae Krieg 2012
                     32 Family Prevotellaceae Krieg 2012
                     33 Family Prolixibacteraceae Huang et al. 2014
                     34 Family Rikenellaceae Krieg et al. 2012
                     35 Family Salinivirgaceae Ben Hania et al. 2017 [monotypic]
                     36 Family Tannerellaceae Ormerod et al. 2022
                     37 Family Tenuifilaceae Podosokorskaya et al. 2021
                     38 Family Williamwhitmaniaceae Pikuta et al. 2017
                     39 Family "Quyinboaceae" Song et al. 2025 nom. inval. [monotypic]
                     40 Family "Candidatus Aminobacteroidaceae" Mei et al. 2022 [monotypic]
                     41 Family "Candidatus Homeothermaceae" Ormerod et al. 2020 [monotypic]
                     42 Family "Candidatus Azobacteroidaceae" Chuvochina et al. 2023 nom. pro-inval.