Phylum Foraminifera d'Orbigny, 1826 see Subphylum Foraminifera d'Orbigny, 1826
   Class Miliolata Saidova, 1981 - porcelaneous foraminifers
     Subclass Miliolana Saidova, 1981
       Superorder Milioloida Delage & Hérouard, 1896
         Order Miliolida Delage & Hérouard, 1896
           Suborder Miliolina Delage & Hérouard, 1896
             Superfamily Quinqueloculinoidea Cushman, 1917
               Family Pyrgoidae Mikhalevich, 1983
                 Subfamily Biloculinellinae Mikhalevich, 1986
                   1 Genus Biloculinella Wiesner, 1931
                   2 Genus Nummulopyrgo Hofker, 1983
                   3 Genus Istriloculina Neagu, 1984
                   4 Genus Sigmopyrgo Hofker, 1983