Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [[crown] 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 Spirotricha]
                     1 [Suborder Heterotricha Stein, 1859]
                     2 [Suborder Hypotricha Stein, 1859]
                     3 [Suborder Oligotricha Bütschli, 1889]
                     4 [Suborder Entodiniomorpha]