Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Bacillatiᵀ (Gibbons and Murray 1978) Oren and Göker 2024
               [Phylum Cyanobacteria Garcia-Pichel et al. (2020)] see Phylum Cyanobacteriota Oren et al. 2022
                 [Class Cyanophyceae Hauck (1885)] see Class Chroococcophyceae Hollerbach et al. 1953
                   [Order Spirulinales Komárek, J. Kaštovský, J. Mareš & J.R.Johans. (2014)] see Order Spirulinales Komárek et al. 2014
                     [Family Spirulinaceaeᵀ Hoffmann, Komárek & Kaštovský (2014)] see Family Spirulinaceae (Gomont 1892) Hoffmann et al. 2014
                       [Genus Spirulinaᵀ P.J.F. Turpin ex Gomont (1892)] see Genus Spirulina Turpin ex 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 major Kütz. [ICBN]]
                         ?Spirulina mariae Margalef (1953), nom. dub.
                         Spirulina nordstedtii Gomont 1892-1893[1893]
                         Spirulina platensis
                         Spirulina subsalsa Oersted
                         Spirulina tenuissima Kützing 1836