[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838 Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875 Family Spongodiscidae Haeckel, 1862 Genus Spongodiscus Ehrenberg, 1854 †Spongodiscus quartus (Borisenko, 1958) †Spongodiscus quartus quartus (Borisenko, 1958)