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 Spirotrichea Bütschli, 1889
             ?Order Clevelandellida de Puytorac & Grain, 1976
               Family Nyctotheridae Amaro, 1972
                 1 Genus Pronyctotherus Albaret & Njiné, 1976
                 2 Genus Nyctotherus Leidy, 1849
                 3 Genus Nyctositum Affa'a, 1979
                 4 Genus Pygmotheroides Affa'a, 1979[1980]
                 5 Genus Nyctotheroides Grassé, 1928
                 6 Genus Metanyctotherus J.-L. Albaret, 1970
                 7 Genus Paracichlidotherus Grim, 1992
                 8 Genus Cichlidotherus Affa'a, 1989