Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           ["prokaryotes" - bacteria] see Domain Bacteria Woese et al. 1990 stat. inval.
             [Class "Cyanoprokaryota" Komárek & Golubić 1990 nom. nud. - cyanoprokaryotes]
               [Order Stigonematales Geitler (1925)] see Order Nostocales Borzì (1914)
                 [Family Mastigocladaceae Geitler (1925)] see Family Hapalosiphonaceae Elenkin (1917), nom. cons.
                   [Subfamily Brachytrichioideae (E. Bornet & C. Flahault) F.E. Fritsch (1945)] see Family Symphyonemataceae Hoffmann, Komárek & Kaštovský (2005), nom. inval.