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 Bacillatiᵀ (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Cyanobacteriota Oren et al. 2022
                 Class Chroococcophyceaeᵀ Hollerbach et al. 1953
                   Order Gomontiellales Strunecký and Mareš 2023, sedis mutabilis
                     Family Chamaesiphonaceae Borzì 1878
                       1 Genus Brachythrix Braun 1865
                       2 Genus Chamaesiphonᵀ Braun 1864
                       3 Genus Clastidium Kirchner 1880
                       4 Genus Cyanophanon Geitler 1955
                       5 Genus Geitleribactron Komárek 1975
                       6 Genus Hyellococcus Schmidle 1905
                       7 Genus Sphaerogonium Rostafinski 1883