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 Fusobacteriati Battistuzzi and Hedges 2024 [monotypic]
               Phylum Fusobacteriotaᵀ Garrity and Holt 2021 [monotypic]
                 Class Fusobacteriiaᵀ Staley and Whitman 2012 [monotypic]
                   Order Fusobacterialesᵀ Staley and Whitman 2012
                     Family Fusobacteriaceaeᵀ Staley and Whitman 2012
                       Genus Fusobacteriumᵀ Knorr 1922 (Approved Lists 1980)
                         Fusobacterium nucleatumᵀ Knorr 1922 (Approved Lists 1980)
                           1 Fusobacterium nucleatum subsp. animalis Gharbia and Shah 1992
                           2 Fusobacterium nucleatum subsp. fusiforme (ex Veillon and Zuber 1898) Gharbia and Shah 1992
                           3 Fusobacterium nucleatum subsp. nucleatumᵀ (Knorr 1922) Dzink et al. 1990
                           4 Fusobacterium nucleatum subsp. polymorphum (ex Knorr 1922) Dzink et al. 1990
                           5 Fusobacterium nucleatum subsp. vincentii Dzink et al. 1990