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
             1 Genus Phthanotrochus Arnold, 1978
             2 Genus Periptigma Arnold, 1978 see Genus Periptygma Arnold, 1978