[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838 Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875 Family Pyloniidae Haeckel, 1881 Genus †Histiastrum Ehrenberg, 1847 †Histiastrum quaternarium Ehrenberg, 1873