[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838 Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875 Family Coccodiscidae Haeckel, 1862 Genus †Periphaena Ehrenberg, 1873 †Periphaena tripyramis (Haeckel, 1887) †Periphaena tripyramis tripyramis (Haeckel, 1887)