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]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               "protists" incertae sedis
                 "free-living heterotrophic flagellates"
                   ?[Genus Spiromonas B.V. Skvortzov, 1958, nom. illeg.] see Genus Nodamastix B.V. Skvortzov & M. Noda, 1968
                     1 Spiromonas spirogyraeᵀ B.V. Skvortzov, 1958