organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain eukaryotes see Domain Eukaryota Chatton, 1925
     alveolates Cavalier-Smith see [unranked] Alveolata Cavalier-Smith, 1991
       Phylum Ciliophora Doflein, 1901 - ciliates
         Subphylum Intramacronucleata Lynn, 1996 - amphiesmates
           Class Oligohymenophorea de Puytorac et al., 1974 - oligohymenophoreans
             Subclass Astomatia Schewiakoff, 1896
               Order Astomatidaᵀ Schewiakoff, 1896
                 1 Family Anoplophryidae Cépède, 1910
                 2 Family Haptophryidae Cépède, 1910
                 3 Family Clausilocolidae de Puytorac, in Corliss, 1979
                 4 Family Maupasellidae Cépède, 1910
                 5 Family Intoshellinidae Cépède, 1910
                 6 Family Contophryidae de Puytorac, 1972
                 7 Family Radiophryidae de Puytorac, 1972
                 8 Family Hoplitophryidae Cheissin, 1930