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
               Clade neokaryotes Cavalier-Smith 1993 - mitochondrial eukaryotes
                 Clade neozoa Cavalier-Smith 1993
                   Clade scotokaryotes Cavalier-Smith 2000
                     [plesion] Phylum Metamonada Grassé, 1952
                       Subphylum Trichozoa Cavalier-Smith, 1997
                         Superclass Parabasalia Honigberg, 1973 - parabasalids
                           Class Trichomonadea Kirby, 1947
                             Subclass Cristomonadia Cavalier-Smith, 2012
                               Order Spirotrichonymphida Grassé, 1952 [monotypic]
                                 1 Family Holomastigotoididaeᵀ Copeland, 1956