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 Scenedesmusᵀ F.J.F. Meyen (1829)
                                         Scenedesmus quadricauda (Turpin) L.A. de Bréb., in L.A. de Bréb. & L.L. Godey (1835)
                                           01 Scenedesmus quadricauda f. crassiaculeatus Uherkovich
                                           02 Scenedesmus quadricauda f. granulatus T. Hortobágyi (1960)
                                           03 Scenedesmus quadricauda f. minus Ralfs
                                           04 Scenedesmus quadricauda var. armatus (Chodat) Deduss.
                                           05 Scenedesmus quadricauda var. dispar Bréb.
                                           06 Scenedesmus quadricauda var. ecornis Francé
                                           07 Scenedesmus quadricauda var. horridus Kirchner
                                           08 Scenedesmus quadricauda var. incurvus Playfair
                                           09 Scenedesmus quadricauda var. inermius Playfair
                                           10 Scenedesmus quadricauda var. longispinus G.M. Sm.
                                           11 Scenedesmus quadricauda var. maximus W.West & G.S.West (1895)
                                           12 Scenedesmus quadricauda var. parvus G.M. Sm. (1916)
                                           13 Scenedesmus quadricauda var. quadrispina (R.H. Chodat, 1913) G.M. Sm. (1916)