Family Raphidiophryidae (ref. ID; 4884 original paper)
Diagnosis: Centrohelid heliozoa with a periplast comprising siliceous elements. The latter are usually represented by only tangential spicules or scales. Radial elements (if present) lack a shaft and have a trumpet- or funnel-like shape; they occupy external periplast layers, while tangential scales lie in internal ones. The family Raphidiophryidae should include four genera: Parasphaerastrum Mikrjukov, Polyplacocystis Mikrjukov, Raphidiophrys Archer, emend. Mikrjukov, and Raphidocystis Penard.