Supergroup Rhizaria Cavalier-Smith, 2002 see Infrakingdom Rhizaria Cavalier-Smith, 2002
   Phylum Foraminifera d'Orbigny, 1826 see Subphylum Foraminifera d'Orbigny, 1826
     Class Astrorhizata Saidova, 1981
       Subclass Lagynana Mikhalevich, 1980
         Order Ammoscalariida Mikhalevich, 1980
           Family Phthanotrochidae Arnold, 1978
             Genus Periptigma Arnold, 1978 see Genus Periptygma Arnold, 1978