Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade eucorta Cavalier-Smith, 2021
                       Superkingdom Corticata Lankester, 1878 - corticates
                         Kingdom Plantae Haeckel (1866) - plants
                           Subkingdom Viridiplantae Caval.-Sm. (1981) - green plants
                             Phylum Chlorophyta Pascher (1914) [coordinate rank] - green algae
                               "core chlorophytes"
                                 Class Chlorophyceae Wille (1884) - chlorophytes
                                   Order Sphaeropleales Luerssen (1877)
                                     Family Scenedesmaceae Oltmanns
                                       [Genus Staurogenia Kützing (1849)] see Genus Crucigenia C. Morren (1830)
                                         1 [Staurogenia quadrataᵀ (C. Morren, 1830) Kützing] see Crucigenia quadrata C. Morren (1830)
                                         n.1 [Staurogenia apiculata Lemmermann] see Crucigeniella apiculata (Lemmermann) Schmidle (1900)
                                         n.2 [Staurogenia irregularis (Wille, 1898) Wille] see Crucigeniella irregularis (Wille, 1898) Tsarenko & D.M. John (2002)