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 Sigmoilinitidae Łuczkowska, 1974
                 Subfamily Sigmoilinitinae Łuczkowska, 1974
                   1 Genus Sigmoilina Schlumberger, 1887
                   2 Genus Sigmella Azbel & Mikhalevich, 1983, nom. illeg.
                   3 Genus Spirosigmoilina Parr, 1942
                   4 Genus Sigmoilinella Zheng, 1979
                   5 Genus Sigmoilinita Seiglie, 1965