[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838 Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875 Family Heliodiscidae Haeckel, 1881 Genus Heliodiscus Haeckel, 1862 †Heliodiscus hexasteriscus Clark & Campbell, 1942