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 Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Methylococcales Bowman 2005
                     Family Crenotrichaceae Hansgirg 1888 (Approved Lists 1980)
                       1 Genus Clonothrix Roze 1896
                       2 Genus Crenothrixᵀ Cohn 1870 (Approved Lists 1980) [monotypic]
                       3 Genus Toxothrix Molisch 1925 (Approved Lists 1980) [monotypic]