Schewiakoff, 1926
Spicules strongly widened basally, tapering distally, sharp. Some specimens with 2 equatorial spicules much longer than other 18. In live specimens cupola-shaped extensions of calymma can be seen over spicules. Elastic fibrillae of calymma form heptagons or hexagons around spicules, each with 5-6 pores. Spicule length: 0.28 mm.