[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) 1 †Periphaena tripyramis triangula (Sutton, 1896) 2 †Periphaena tripyramis tripyramis (Haeckel, 1887)