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 Betaproteobacteria Garrity et al. 2006
                   Order Neisseriales Tønjum 2006
                     Family Neisseriaceaeᵀ Prévot 1933 (Approved Lists 1980)
                       Genus Kingella Henriksen and Bøvre 1976 (Approved Lists 1980)
                         1 Kingella denitrificans Snell and Lapage 1976 (Approved Lists 1980)
                         2 Kingella kingaeᵀ (Henriksen and Bøvre 1968) Henriksen and Bøvre 1976 (Approved Lists 1980)
                         3 Kingella oralis corrig. Dewhirst et al. 1993
                         4 Kingella potus Lawson et al. 2005