[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838 Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875 Family Spongodiscidae Haeckel, 1862 Genus Spongaster Ehrenberg, 1860 Spongaster tetras Ehrenberg, 1860 1 †Spongaster tetras irregularis Nigrini, 1967 2 †Spongaster tetras tetras Ehrenberg, 1860