organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Protoctista Hogg, 1860
     Phylum Zoomastigina see Phylum Discomitochondria
       ?Class "opalinids" see Family Opalinidae Claus, 1874
         1 Genus Protoopalina Metcalf, 1918
         2 Genus Zelleriella Metcalf, 1920, nom. nud.
         3 Genus Cepedea Metcalf, 1920
         4 Genus Opalina Purkinje & Valentin, 1835