[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838 Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847 Family Theoperidae Haeckel, 1881 Genus †Sethochytris Haeckel, 1881 1 †Sethochytris babylonis (Clark & Campbell, 1942) 2 †Sethochytris cavipodis O'Connor, 1999