[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838 Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847 Family Plagiacanthidae Hertwig, 1879 Genus Lithopilium Popofsky, 1913 1 Lithopilium reticulatum Popofsky, 1913 2 †Lithopilium sphaerocephalum Popofsky, 1913