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 Nostocophycideae
                     Order Nostocalesᵀ Borzì (1914)
                       Family Rivulariaceae Kützing (1843)
                         Genus Calothrix C.Agardh ex É. Bornet & C. Flahault 1886 [ICBN]
                           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