Bigyra Cavalier-Smith, 1998
   Subphylum Opalozoa Cavalier-Smith, 1992
     Infraphylum Placidozoa Cavalier-Smith, 2013
       1 Superclass Wobblata Cavalier-Smith, 2013 [paraphyletic]
       1.3.2 Superclass Opalinata Wenyon, 1926