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 Geitlerinematales Strunecký & Mareš (2023) [monotypic]] see Order Geitlerinematales Strunecký and Mareš 2023
                     [Family Geitlerinemataceaeᵀ Strunecký & Mareš (2023) [monotypic]] see Family Geitlerinemataceae Strunecký and Mareš 2023
                       [Genus Geitlerinemaᵀ (Anagn. & Komárek) Anagn. (1989) [polyphyletic]] see Genus Geitlerinema (Anagnostidis and Komárek 1988) Anagnostidis 1989
                         Geitlerinema acutissimum (H. Kufferath) K. Anagnostidis 1989
                         Geitlerinema amphibium (C.A. Agardh ex M. Gomont) K. Anagnostidis 1989
                         Geitlerinema deflexum (W. West and G.S. West) K. Anangnostidis 1989
                         Geitlerinema lemmermannii (J. Woloszynska) K. Anagnostidis 1989
                         Geitlerinema splendidum (R.K. Greville ex M. Gomont) K. Anagnostidis 1989
                         Geitlerinema unigranulatum (R.N. Singh) J. Komárek and M.T.P. Azevedo 2000