[living organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryota Whittaker & Margulis, 1978 see Domain Eukaryota Chatton, 1925
     Kingdom Chromista Caval.-Sm. (1981) - chromists
       Subkingdom Harosa Cavalier-Smith, 2010
         Infrakingdom Halvaria Cavalier-Smith, 2010
           Superphylum Heterokonta Caval.-Sm. (1986)
             Phylum Bigyra Cavalier-Smith, 1998
               Class Opalinea Wenyon, 1926
                 1 Order Opalinida Poche, 1913 [monotypic]
                 2 Order Proteromonadida Grassé, 1952 [monotypic]