Familia Thalassosphaerida

Haeckel, 1862

Solitary, with siliceous spicules scattered in the calymma; genera:

Thalassosphaera
Thalassoxanthium (Thalassoxanthium medusinum; Thalassoxanthium cervicorne)
Physematium
Thalassoplancta
Lampoxanthium (Lampoxanthium pandora)