(Müller, 1856)
Spicules cylindrical or compressed, broadest where apophyses arise, narrowing gradually toward both ends. Sphere with large pores of irregular size and shape, and wide bars, forked once. Basal ends of spicules forming central mass. Accessory spines with barb-like hooks, length 1/3 of spicules. Diameter of sphere: 0.09-0.10 mm; spicule length: 0.10-0.15 mm.