(Haeckel)
Diagnosis: Radial tubes club-shaped, straight, thickened distally and constricted beyond the ovate, inflated, terminal knob. Knob similar to a candelabrum with a corona of 6 to 9 strongly curved terminal branches, which are 8 to 10 times as long as the tube width, with scattered lateral denticles, and with a spathilla of 5 to 7 radial teeth.
Length of tubes: 1.6-2.4 mm.