Bigyra Cavalier-Smith, 1998
   Subphylum Opalozoa Cavalier-Smith, 1992
     Infraphylum Bikosia Cavalier-Smith, 2013 [monotypic]
       Class Bikosea Cavalier-Smith, 2013
         Subclass Bicosidia Cavalier-Smith, 2006
           Superorder Cyathobodoniae Cavalier-Smith, 1993
             Order Anoecida Cavalier-Smith, 1997
               Family Caecitellidae Cavalier-Smith, 2006
                 1 Genus Caecitellus Patterson et al., 1993
                 2 Genus Halocafeteria Park et al., 2006 [monotypic]