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 Chroococcales Wettst. (1924)
                       Family Spirulinaceae (Gomont) Hoffmann, Komárek & Kaštovský
                         Genus Spirulinaᵀ P.J.F. Turpin ex M. Gomont (1892)
                           ?Spirulina aeruginea Buell (1938), nom. dub.
                           ?Spirulina allansonii Welsh (1961), nom. dub.
                           ?Spirulina attenuata Umezaki (1952), nom. dub.
                           ?Spirulina cabrerae González-Guerrero (1946), nom. dub.
                           ?Spirulina cavanillesiana González-Guerrero (1946), nom. dub.
                           ?Spirulina erdosensis Tian et al. (2002), nom. dub.
                           ?Spirulina gordiana González-Guerrero (1946), nom. dub.
                           Spirulina laxa G.M. Smith 1916
                           Spirulina laxissima G.S. West 1907
                           ?Spirulina mariae Margalef (1953), nom. dub.
                           Spirulina nordstedtii Gomont 1892-1893[1893]
                           Spirulina platensis
                           Spirulina subsalsa Oersted
                           Spirulina tenuissima Kützing 1836