[1] It is an encrusting tubular sponge that grows anchored on rocky surfaces of coral reefs.

Haliclona caerulea takes the form of an encrusting mass of cylindrical to volcano-shaped projections between 2 and 15 cm, with oscula at the high end.

These cells have a dual function: ingesting food particles, and maintaining the flow of water through the sponge's body.

Sclerocyte cells are responsible for secreting a kind of skeleton for supporting the sponge's body, formed of spongin fibers.

[5] A sponge going by the name of Haliclona caerulea can sometimes be found in the aquarium trade, though this appears to be Amphimedon texotli.