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 Apostomatia Chatton & Lwoff, 1928
               Order Apostomatidaᵀ Chatton & Lwoff, 1928
                 Family Foettingeriidae Chatton, 1911
                   1 Genus Spirophrya Chatton & Lwoff, 1924
                   2 Genus Phtorophrya A. Chatton & M. Lwoff, 1930
                   3 Genus Phoretophrya A. Chatton & M. Lwoff, 1930
                   4 Genus Hyalophysa Bradbury, 1966
                   5 Genus Gymnodiniodes nom. null. see Genus Gymnodinioides Minkiewicz, 1912
                   5 Genus Gymnodinioides Minkiewicz, 1912