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 Synechococcalesᵀ
                       Family Merismopediaceae Elenkin (1933)
                         Genus Eucapsis F.E. Clements & H.L. Shantz (1909)
                           Eucapsis alpina Clements and Shantz 1909
                           Eucapsis minor (H. Skuja) A.A. Elenkin 1933
                           Eucapsis minuta Fritsch 1912
                           Eucapsis parallelepipedon (W. Schmidle) J. Komárek and F. Hindák 1989
                           Eucapsis starmachii Komárek and Hindák 1989