[3] These globular sponges lack porocalices (special pore bearing pits) and auxiliary megascleres.

Spicule strands at the base act as a root system, attaching the sponge to the substrate.

[3] The spirally radiate skeleton is made of bundles of oxeas (needle-shaped spicules) originating from the center of the sponge.

These become mixed with triaenes (elongated spicules with three rays at one end), mainly protriaenes.

The microscleres are sigmaspires (a spirally twisted s-shaped spicule).