Spicules thin, cylindrical, pin-shaped, equally thick and long inside and outside shell. Pores of latticed sphere roundish, bars thin. Aspinal pores pentagonal, more rarely oval, 10-20 times larger than bars. Accessory spines undulating, short (6 times shorter than shell radius). Diameter of sphere: 0.2-0.3 mm; spicule length (outside sphere): 0.10-0.15 mm; length of accessory spines: 0.05 mm.