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 Scuticociliatia (E.B. Small, 1967)
               Order Pleuronematida Fauré-Fremiet, 1956
                 Family Cyclidiidae Ehrenberg, 1838
                   1 Genus Cristigera Roux, 1899
                   2 Genus Pseudocyclidium Small & Lynn, 1985
                   3 Genus Echinocyclidium Jankowski, in Small & Lynn, 1985
                   4 Genus Cyclidium O.F. Müller, 1773
                   5 Genus Paurotricha Dragesco & Dragesco-Kernéis, 1991
                   6 Genus Paracyclidium Grolière et al., 1980
                   7 Genus Isocyclidium Esteban et al., 1993