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 Oscillatoriophycideae
                     Order Oscillatorialesᵀ Elenkin (1934)
                       Family Phormidiaceae Anagnostidis & Komárek (1988)
                         Subfamily Phormidioideaeᵀ
                           Genus Arthrospira E. Stizenberger ex Gomont 1892-1893[1893] [ICBN]
                             Arthrospira ghannae Drouet & Strickland in Drouet (1942)