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)
                         1 Genus Calothrix C.Agardh ex É. Bornet & C. Flahault 1886 [ICBN]
                         2 Genus Dichothrix Zanardini ex Bornet & Flahault (1886)
                         3 Genus Gardnerula G. De Toni (1936)
                         4 Genus Gloeotrichia J.Agardh ex Bornet & Flahault (1886)
                         5 Genus Isactis G. Thuret ex É. Bornet & C. Flahault (1886)
                         6 Genus Rivulariaᵀ C.Agardh ex É. Bornet & C. Flahault (1886)
                         7 Genus Sacconema A. Borzì ex É. Bornet & C. Flahault (1886)