[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875
     Family Tholoniidae Haeckel, 1887
       Genus Tholoma Haeckel, 1887
         1 Tholoma metallasson Haeckel, 1887