[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875
     Family Actinommidae Haeckel, 1862
       Genus Stylatractus Haeckel, 1887
         1 †Stylatractus coronatus (Ehrenberg, 1847)
         2 †Stylatractus fragilis Haeckel, 1887
         3 †Stylatractus giganteus Haeckel, 1887
         4 †Stylatractus neptunus Haeckel, 1887
         5 Stylatractus ostracion (Haeckel, 1887)
         6 Stylatractus pluto (Haeckel, 1887)
         7 †Stylatractus santaennae (Campbell & Clark, 1949)
         8 †Stylatractus transparum Lazarus, 1990
         9 †Stylatractus universus Hays, 1970