[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838 Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847 Family Theoperidae Haeckel, 1881 Genus Pterocanium Ehrenberg, 1847 Pterocanium praetextum (Ehrenberg, 1872) 1 †Pterocanium praetextum eucolpum Haeckel, 1887 2 †Pterocanium praetextum praetextum (Ehrenberg, 1872)