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 Litostomatea Small & Lynn, 1981
             Subclass Haptoria Corliss, 1974
               Order Haptoridaᵀ Corliss, 1974
                 Family Spathidiidae Kahl, 1929
                   1 Genus Bryophyllum Kahl, 1931
                   2 Genus Perispira Stein, 1859
                   3 Genus Myriokaryon Jankowski, 1973
                   4 Genus Cranotheridium Schewiakoff, 1892
                   5 Genus Protospathidium Dragesco & Dragesco-Kernéis, 1979
                   6 Genus Spathidium Dujardin, 1841
                   7 Genus Supraspathidium Foissner & Didier, 1981
                   8 Genus Arcuospathidium Foissner, 1984
                   9 Genus Epispathidium Foissner, 1984