[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847
     Family Pterocorythidae Haeckel, 1881 see Family Pterocoryidae Haeckel, 1881
       Genus Theocorythium Haeckel, 1887
         Theocorythium trachelium (Ehrenberg, 1872)
           1 †Theocorythium trachelium dianae (Haeckel, 1887)
           2 †Theocorythium trachelium trachelium (Ehrenberg, 1872)