Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota J.R. Wagner, 2004 [J. Wiemann et al., 2020]
           Clade neomura T. Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria T. Cavalier-Smith, 2022(2021)
                 Clade natates T. Cavalier-Smith, 2022(2021)
                   Clade photaria T. Cavalier-Smith, 2022(2021)
                     Clade eucorta T. Cavalier-Smith, 2022(2021)
                       Superkingdom Corticata (Lankester, 1878) T. Cavalier-Smith, in T. Cavalier-Smith et al., 2015 - corticates
                         Kingdom Chromista T. Cavalier-Smith, 1981, nom. descript. - chromists
                           Subkingdom Harosa T. Cavalier-Smith, 2010
                             [crown] Clade Sar S.M. Adl et al., 2012 [A.G.B. Simpson & M. Dunthorn, 2020]
                               Infrakingdom Halvaria T. Cavalier-Smith, 2010
                                 Superphylum Heterokonta (T. Cavalier-Smith, 1986), nom. descript.
                                   Phylum Ochrophyta T. Cavalier-Smith, 1995, nom. descript., nom. emend.
                                     Subphylum Khakista T. Cavalier-Smith, 2000, nom. descript.
                                       Diatomea F.T. Kützing, 1844, nom. emend.
                                         Class Bacillariophyceae Haeckel, 1878 - pennates
                                           Subclass Bacillariophycidaeᵀ (Haeckel, 1878) D.G. Mann, in F.E. Round et al., 1990 - raphid diatoms
                                             Order Cymbellales D.G. Mann, in F.E. Round et al., 1990
                                               Family Cymbellaceaeᵀ Greville, 1833
                                                 Genus Cymbellaᵀ C.A. Agardh, 1830
                                                   Cymbella symmetrica McCall, 1933