Shell spherical. Each spicule arising from a pentagonal or hexagonal pit with large ovoid to circular aspinal pores, surrounded by smaller pits. Among latter are 5-6 larger, pentagonal, poreless ones, at vertices of plates, and 5-6 smaller, quadrate, with one sutural pore each. All pits conspicuously framed. Size of sutural pores variable from almost as large as aspinal to half their size. In adult specimens sides and angles of frame crests give rise to thin spines of variable length. Shell diameter (excluding spicules): 0.36-0.58 mm; spicule length: 0.18-0.58 mm; length of spines: 0.08-0.04 mm.