They are located on top of conical projections distributed throughout the cormus and receive the excurrent water from water-collecting tubes.

The skeleton has no special organisation, and it comprises triactines, tetractines and tripods.

Triactines and tetractines are equiangular and equiradiate; their actines are slightly conical, with blunt tips.

Triactines are the most abundant spicules; the apical actine is shorter and thinner than the facial ones.

[1] World Register of Marine Species entry This article about a calcareous sponge is a stub.