Phylum Bigyra Cavalier-Smith, 1998
   Subphylum Sagenista Cavalier-Smith, 1995
     Class Labyrinthulea Olive ex Cavalier-Smith, 1986
       Superfamily Amphifiloidea Cavalier-Smith, 2012
         1 Family Amphifilidae Cavalier-Smith, 2012 [monotypic]
         2 Family Sorodiplophryidae Cavalier-Smith, 2012 [monotypic]