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 discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Phylum Metamonada Grassé, 1952 [coordinate rank]
                     Subphylum Trichozoa Cavalier-Smith, 1997
                       Infraphylum Parabasalia Honigberg, 1973
                         Class Trichomonadea Kirby, 1947
                           Subclass Cristomonadia Cavalier-Smith, 2012
                             Order Cristamonadidaᵀ Brugerolle & Patterson, 2001
                               Family Devescovinidae Doflein, 1911
                                 Subfamily Devescovininaeᵀ Doflein, 1911
                                   Genus Foaina Janicki, 1915
                                     Foaina acontophora Kirby
                                     Foaina dogieli
                                     Foaina funifera Kirby
                                     Foaina gracilis
                                     Foaina hamata Kirby
                                     Foaina humilis Kirby, 1942
                                     Foaina minuta
                                     Foaina nana (Kirby)
                                     Foaina nucleofleva Kirby
                                     Foaina parvula Kirby
                                     Foaina ramulosa Kirby
                                     Foaina reflexa Kirby
                                     Foaina solita Kirby
                                     Foaina taeniola