Phylum Actinopoda Calkins, 1902 Class Polycystina Ehrenberg, 1838 see Class Polycystinea Ehrenberg, 1838 Order Spumellarida see Order Spumellaria Ehrenberg, 1875 Suborder Sphaerocollina 1 Family Bathysphaeridae 2 Family Centrocollidae 3 Family Orosphaeridae Haeckel, 1887 4 Family Physematidae see Family Thalassicollidae Haeckel, 1862 5 Family Thalassicollidae Haeckel, 1862 6 Family Thalassophysidae see Family Sphaerozoidae Haeckel, 1862 7 Family Thalassothamnidae Haecker, 1906