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 Thigmotrichida Chatton & Lwoff, 1922
                 1 Family Ancistridae Issel, 1903
                 2 Family Hemispeiridae König, 1894
                 3 Family Hysterocinetidae Diesing, 1866
                 4 Family Paraptychostomidae Ngassam et al., in de Puytorac, 1994