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]
           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
                             Infrakingdom Streptophyta Caval.-Sm. (1993)
                               Clade Phragmoplastophyta Lecointre & Le Guyader 2006 [Hall, McCourt, Delwiche, Mishler & Karol 2020]
                                 Phylum Charophytaᵀ Migula (1889) [monotypic]
                                   Order Zygnematales [paraphyletic] - filamentous conjugates and saccoderm desmids
                                     Family Zygnemataceaeᵀ (Meneghini) Kützing (1843) [polyphyletic]
                                       Genus Transeauina Guiry (2013)
                                       Genus Lloydina A. Ahmad & M. Goldstein (1972) [monotypic]
                                       Genus Mougeotia C.Agardh (1824), nom. cons.
                                       Genus Mougeotiella Yamagishi (1963)
                                       Genus Mougeotiopsis Palla (1894) [monotypic]
                                       Genus Neozygnema Yamagishi (1963) [monotypic]
                                       Genus Sangirellum A.K. Mahato & P. Mahato (1994) [monotypic]
                                       Genus Sirocladium Randhawa (1941)
                                       Genus Spirogyra Link (1820), nom. cons.
                                       Genus Sirogonium Kütz. (1843), nom. cons.
                                       Genus Temnogametum West & G.S.West (1897)
                                       Genus Temnogyra I.F. Lewis (1925)
                                       Genus Trigonum A.K. Mahato & P. Mahato (1994) [monotypic]
                                       Genus Pleurodiscus Lagerh. (1895)
                                       Genus Zygnemopsis (Skuja) Transeau (1934)
                                       Genus Zygogonium Kütz. (1843), nom. cons.
                                       Genus Zygnemaᵀ C.Agardh (1817), nom. cons.
                                         Zygnema carinatum
                                         Zygnema chalybeospermum
                                         Zygnema conspicuum
                                         Zygnema cyanosporum
                                         Zygnema decussatum
                                         Zygnema insigne Kützing
                                         Zygnema leospermum
                                         Zygnema micropunctatum
                                         Zygnema sterile
                                         Zygnema synadelphum
                                         1 Zygnema cruciatumᵀ (Vaucher) C.Agardh
                                         2 Zygnema pectinatum (Vaucher) C.Agardh
                                         3 Zygnema stellinum (O.F.Müll.) C.Agardh