Haeckel, 1887
Shell massive, ovoid or spherical. Spicules outside shell long, sword-shaped, basal ends conical, joined at center into spherical or ellipsoidal body. Sutures well marked. Usually 1 sutural pore per suture, seldom 2 pores, 5-6 times smaller than aspinal. Diameter of shell (without spicules): 0.14-0.16 mm; length of spicules: 0.06-0.07 mm.