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 Arcicella Nikitin et al. 2004
                         1 Arcicella aquaticaᵀ Nikitin et al. 2004
                         2 Arcicella aurantiaca Sheu et al. 2010
                         3 Arcicella rigui Chen et al. 2013
                         4 Arcicella rosea Kämpfer et al. 2009