Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
   Diaphoretickes Adl et al., 2012 see Superkingdom Corticata Lankester, 1878
     [crown] Clade Sar Adl et al. 2012 see Subkingdom Harosa Cavalier-Smith, 2010
       Stramenopiles Patterson, 1990 - stramenopiles see Superphylum Heterokonta Caval.-Sm. (1986)
         Opalinata Wenyon, 1926 see Superclass Opalinata Wenyon, 1926
           Opalinea Wenyon, 1926 see Class Opalinea Wenyon (1926)
             Genus Protoopalina Metcalf, 1918