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 Alphaproteobacteria Garrity et al. 2006
                   01 Genus "Charonomicrobium" Csotonyi et al. 2011 nom. inval., incertae sedis
                   02 Genus "Marinosulfonomonas" Holmes et al. 1997 nom. inval., incertae sedis
                   03 Genus "Methylosporovibrio" Tsuji et al. 1990 nom. inval., incertae sedis
                   04 Genus "Methylosulfonomonas" Holmes et al. 1997 nom. inval., incertae sedis
                   05 Genus "Nanobacterium" Ciftcioglu et al. 1997 nom. inval., incertae sedis
                   06 Genus "Tetracoccus" Blackall et al. 1997 nom. inval., incertae sedis
                   07 Genus "Candidatus Anoxypelagibacter" corrig. Ruiz-Perez et al. 2022, incertae sedis
                   08 Genus "Candidatus Catenimonas" Levantesi et al. 2020, incertae sedis
                   09 Genus "Candidatus Combothrix" Levantesi et al. 2020, incertae sedis
                   10 Genus "Candidatus Endolissoclinum" Kwan et al. 2020, incertae sedis
                   11 Genus "Candidatus Endowatersipora" Anderson and Haygood 2020, incertae sedis
                   12 Genus "Candidatus Enterousia" Gilroy et al. 2022, incertae sedis
                   13 Genus "Candidatus Hodgkinia" McCutcheon et al. 2020, incertae sedis
                   14 Genus "Candidatus Mesopelagibacter" Ruiz-Perez et al. 2022, incertae sedis
                   15 Genus "Candidatus Micropelagius" corrig. Jimenez-Infante et al. 2020, incertae sedis
                   16 Genus "Candidatus Monilibacter" Levantesi et al. 2020, incertae sedis
                   17 Genus "Candidatus Phycosocius" Tanabe et al. 2020, incertae sedis
                   18 Genus "Candidatus Roseivibrio" corrig. Thiel et al. 2020, incertae sedis
                   19 Genus "Candidatus Scatocola" Gilroy et al. 2022, incertae sedis
                   20 Order Caulobacteralesᵀ Henrici and Johnson 1935 (Approved Lists 1980)
                   21 Order Emcibacterales Iino et al. 2016 [monotypic]
                   22 Order Futianiales Liu et al. 2024 [monotypic]
                   23 Order Holosporales Szokoli et al. 2020
                   24 Order Hyphomicrobiales Douglas 1957 (Approved Lists 1980)
                   25 Order Iodidimonadales Iino et al. 2016 [monotypic]
                   26 Order Kordiimonadales Kwon et al. 2005 [monotypic]
                   27 Order Magnetococcales Bazylinski et al. 2013
                   28 Order Mariprofundales Hördt et al. 2020
                   29 Order Micropepsales Harbison et al. 2017 [monotypic]
                   30 Order Minwuiales Sun et al. 2018 [monotypic]
                   31 Order Radicibacterales Kwon et al. 2025 [monotypic]
                   32 Order Rhodobacterales Garrity et al. 2006
                   33 Order Rhodospirillales Pfennig and Trüper 1971 (Approved Lists 1980)
                   34 Order Rhodothalassiales Venkata Ramana et al. 2014 [monotypic]
                   35 Order Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980)
                   36 Order Sneathiellales Kurahashi et al. 2008 [monotypic]
                   37 Order Sphingomonadales Yabuuchi and Kosako 2006
                   38 Order "Parvularculales" Garrity et al. 2003 nom. nud. [monotypic]
                   39 Order "Candidatus Pelagibacterales" Grote et al. 2020 [monotypic]
                   40 Order "Candidatus Puniceispirillales" Chuvochina et al. 2023 nom. pro-inval. [monotypic]