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 Nostocales Borzì (1914)] see Order Nostocales corrig. Borzì 1914
                     [Family Rivulariaceae Frank (1886)] see Family Rivulariaceae Frank 1886
                       ?[Genus Calothrix C.Agardh ex Bornet & Flahault (1886)] see Genus Calothrix Agardh ex Bornet and Flahault 1886
                         Calothrix braunii Bornet and Flahault 1886
                         Calothrix brevissima G.S. West 1907
                         Calothrix confervicola (W. Dillwyn) C.A. Agardh ex Bornet and Flahault 1886
                         Calothrix consociata (F.T. Kützing) ex Bornet and Flahault 1886
                         Calothrix epiphytica W. and G.S. West 1897
                         Calothrix fusca (F.T. Kützing) ex Bornet and Flahault 1886
                         Calothrix scopulorum (Weber and D.M.H. Mohr) C.A. Agardh ex Bornet and Flahault 1886
                         Calothrix viguieri