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 Oscillatoriophycideae
                     Order Oscillatorialesᵀ Elenkin (1934)
                       Family Ammatoideaceae Elenkin (1949)
                         [Genus Amphithrix F.T. Kützing 1843 ex E. Bornet and C. Flahault 1886] see Genus Homoeothrix (G. Thuret ex E. Bornet & C. Flahault) O. Kirchner in A. Engl. & K. Prantl 1898 nom. cons.