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 Bacteroidota Krieg et al. 2021
                 Class Cytophagia Nakagawa 2012 [monotypic]
                   Order Cytophagalesᵀ Leadbetter 1974 (Approved Lists 1980)
                     Family Spirosomataceae corrig. Larkin and Borrall 1978 (Approved Lists 1980)
                       Genus Flectobacillus Larkin et al. 1977 (Approved Lists 1980)
                         Flectobacillus majorᵀ (Gromov 1963) Larkin et al. 1977 (Approved Lists 1980)