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]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 - cyanobacteria
                 Class "Cyanobacteria" Cavalier-Smith, 2002
                   Subclass Nostocophycideae
                     Order Nostocalesᵀ Borzì (1914)
                       Family Nostocaceaeᵀ Eichler (1886)
                         Subfamily Anabaenoideae (E. Bornet & C. Flahault) O. Kirchner (1900)
                           Genus Aphanizomenon C. Morren ex É. Bornet & C. Flahault 1886-1888[1888] [ICBN]
                             Aphanizomenon flos-aquaeᵀ (L.) J. Ralfs ex Bornet & Flahault 1888 [ICBN]
                               Aphanizomenon flos-aquae var. klebahnii A.A. Elenkin 1909