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
             Subclass Stichotrichia Small & Lynn, 1985
               Order Urostylida Jankowski, 1979
                 Family Pseudokeronopsidae Borror & Wicklow, 1983
                   1 Genus Thigmokeronopsis Wicklow, 1981
                   2 Genus Keronella Wiackowski, 1985
                   3 Genus Tricoronella Blatterer & Foissner, 1988
                   4 Genus Bicoronella Foissner, 1995
                   5 Genus Pseudokeronopsis Borror & Wicklow, 1983