Haeckel, 1879
Diagnosis
Siliceous skeleton of numerous hollow or solid tangential tubes organized in a regular fashion into a large, usually spherical or polyhedral, openly latticed shell. The outer lattice work is a regular arrangement of polygons, mostly triangles, resembling architectural structures known as geodesic domes.
Families treated:
Family Aulosphaeridae Haeckel, 1862
Family Cannosphaeridae Haeckel, 1879
Family Sagosphaeridae Haeckel, 1887