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 Verrucomicrobiota Hedlund 2021
                 Class Opitutia corrig. Choo et al. 2007
                   Order Opitutalesᵀ Choo et al. 2007
                     Family Opitutaceaeᵀ Choo et al. 2007
                       01 Genus Actomonas Zhang et al. 2024
                       02 Genus Alterococcus Shieh and Jean 1999 [monotypic]
                       03 Genus Congregicoccus Islam et al. 2025
                       04 Genus Ereboglobus Tegtmeier et al. 2018
                       05 Genus Geminisphaera Wertz et al. 2018
                       06 Genus Horticoccus Chung et al. 2023
                       07 Genus Lacunisphaera Rast et al. 2025
                       08 Genus Nibricoccus Baek et al. 2019
                       09 Genus Oleiharenicola Rochman et al. 2018
                       10 Genus Opitutusᵀ Chin et al. 2001 [monotypic]
                       11 Genus Rariglobus Pitt et al. 2020
                       12 Genus Termitidicoccus Mei et al. 2024
                       13 Genus "Cephaloticoccus" Lin et al. 2016 nom. inval.
                       14 Genus "Lotipaludicoccus" Park et al. 2026 nom. inval.
                       15 Genus "Candidatus Didemniditutus" corrig. Lopera et al. 2022
                       16 Genus "Candidatus Salsuginivita" Prabhu et al. 2024 nom. pro-inval.