chromalveolates see Supergroup Chromalveolata Adl et al., 2005
   Kingdom Chromista Caval.-Sm. (1981) - chromists
     Subkingdom Chromobiota Caval.-Sm. (1991)
       Infrakingdom Heterokonta Caval.-Sm. (1986) - heterokonts see Superphylum Heterokonta Caval.-Sm. (1986)
         Phylum Bigyra Caval.-Sm. (1998) see Phylum Bigyra Cavalier-Smith, 1998
           Subphylum Opalinata Earl (1971) see Superclass Opalinata Wenyon, 1926
             Class Opalinea Wenyon (1926) see Class Opalinea Wenyon, 1926
               Genus Opalina Purkinje & Valentin, 1835