[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838 Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875 Family Actinommidae Haeckel, 1862 Genus Cromyechinus Haeckel, 1881 1 Cromyechinus icosacanthus Haeckel, 1887 2 †Cromyechinus pycnopora Nishimura, 1992