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 Rivulariaᵀ C.Agardh ex É. Bornet & C. Flahault (1886)
                           Rivularia atra A.W. Roth ex Bornet and Flahault 1886
                           Rivularia beccariana (G. De Notaris) ex Bornet and Flahault 1886
                           Rivularia dura A.W. Roth ex Bornet and Flahault 1886
                           Rivularia minutula (F.T. Kützing) ex Bornet and Flahault 1886
                           Rivularia villosa