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 Hypotrichia (Stein, 1859) Cavalier-Smith, 1993
               Order Euplotida Small & Lynn, 1985
                 Suborder Discocephalina Wicklow, 1982
                   Family Discocephalidaeᵀ Jankowski, 1979
                     1 Genus Psammocephalus Wicklow, 1982
                     2 Genus Marginotricha Jankowski, 1978
                     3 Genus Prodiscocephalus Jankowski, 1979
                     4 Genus Discocephalus Ehrenberg, 1831