[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 Tetracorethra Haeckel, 1881 1 Tetracorethra tetracorethra Haeckel, 1887