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
                 [Order Oscillatoriales Cavalier-Smith 2002 nom. rej.] see Order Oscillatoriales Elenkin (1934)
                   [Genus Halospirulina Nübel et al. 2000] see Genus Spirulina P.J.F. Turpin ex M. Gomont (1892)
                     1 [Halospirulina tapeticolaᵀ Nübel et al. 2000]