Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           [Eukaryota Chatton, 1925 - eukaryotes] see Domain Eukaryota Chatton, 1925
             [Phylum Alveolata Cavalier-Smith, 1991] see Superphylum Alveolata Cavalier-Smith, 1991
               [Subphylum Ciliophora Doflein, 1901] see Phylum Ciliophora Doflein, 1901
                 [Class Ciliata] see [unranked] ciliates
                   [Order Heterotricha Stein, 1859] see Suborder Heterotricha Stein, 1859
                     [Genus "Paramœcium" Hermann, 1783, nom. null.] see Genus Paramaecium Müller, 1773