[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838 Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875 Family Spongodiscidae Haeckel, 1862 Genus Stylotrochus Haeckel, 1862 Stylotrochus quadribrachiatus Sanfilippo & Riedel, 1973 †Stylotrochus quadribrachiatus multibrachiatus Sanfilippo & Riedel, 1973