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
                   Order Rhodospirillales Pfennig and Trüper 1971 (Approved Lists 1980)
                     Family Geminicoccaceae Proença et al. 2018
                       1 Genus Arboricoccus corrig. Proença et al. 2018
                       2 Genus Benzoatithermus Hu et al. 2024
                       3 Genus Defluviicoccus corrig. Maszenan et al. 2005 [monotypic]
                       4 Genus Geminicoccusᵀ Foesel et al. 2008 [monotypic]
                       5 Genus Marinimicrococcus Yang et al. 2024
                       6 Genus Marinivivus Shi et al. 2025
                       7 Genus Tistrella Shi et al. 2003 [monotypic]
                       8 Genus "Candidatus Halysiomicrobium" corrig. Levantesi et al. 2020
                       9 Genus "Candidatus Halysiosphaera" corrig. Levantesi et al. 2020