[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875
     Family Coccodiscidae Haeckel, 1862
       Genus †Diartus Sanfilippo & Riedel, 1980
         1 †Diartus hughesi (Campbell & Clark, 1944)
         2 †Diartus petterssoni (Riedel & Sanfilippo, 1970)
         3 †Diartus sp. Lazarus, 1992