Bigyra Cavalier-Smith, 1998
   Opalozoa Cavalier-Smith, 1992
     1 Bikosea Cavalier-Smith, 2013
     2 Placidozoa Cavalier-Smith, 2013
     3 Pendulomonas Tong, 1997, incertae sedis
     4 Bordnamonas Larsen & Patterson, 1990, incertae sedis