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 Synechococcophycideae
                     Order Pseudanabaenales L. Hoffm., Komárek & Kaštovský (2005)
                       Family Pseudanabaenaceaeᵀ Anagnostidis & Komárek (1988)
                         Subfamily Pseudanabaenoideaeᵀ
                           Genus Romeria M. Koczwara (1932)
                             Romeria crassa Hindák, 1988
                             Romeria cylindrocellularis Hindák, 1988
                             Romeria simplex (F. Hindák) F. Hindák, 1988