Species of sponge with fused spicules forming structures like thorns. Out of the water, this animal disintegrates easily, which requires extreme care in handling.

A relatively common sponge in shaded substrates.

A relatively common sponge in shaded substrates.

Species of sponge with fused spicules forming structures like thorns. Out of the water, this animal disintegrates easily, which requires extreme care in handling.