Description of Theoperidae
provided by BioPedia
Nassellarian polycystines, small spherical or nearly spherical cephalis (smallest anterior chamber), often poreless or sparsely perforate and with apical spine, and one or more post-cephalic chambers; cephalis contains a reduced internal spicule homologous with that of the plagoniids. Generally, cap- or helmet-shaped nassellaria or tending toward conical in overall plan.
