Orange wall sponge

Lore & Background

The orange wall sponge grows as a wall and does not show obvious oscula. Its largely smooth surface is somewhat ridged and contains unevenly distributed rough patches. It has a corky consistency. The sponge is made of scattered tylostyles with the heads on the substrate and the tips piercing the sponge surface. The ectosome is made of densely packed spinispires, with more scattered throughout the choanosome. The spicules include long, thin, slightly curved tylostyles (megascleres with a point at one end and a knob at the other) and characteristic spinispires, which are mostly c-shaped with the ends curved in a different plane to the rest of the spicule; spines occur on only the convex surface.

Reader's Guide

The orange wall sponge is notable for its large size and distinctive spicule composition, particularly the spinispires that are unique in their c-shape and spine arrangement. Its distribution spans the south Atlantic and Indo-Pacific, including South Africa, Namibia, the Vema Seamount, Australia, New Zealand, Ternate, and Zanzibar. It lives on rocky reefs at depths of 5–350 m, commonly on vertical rock faces and in crevices. The sponge's corky texture and lack of obvious oscula distinguish it from other wall-forming sponges. Its presence across such a wide geographic range suggests adaptability to various marine environments, though its specific ecological role is not detailed in the available information.

Did You Know?

• The orange wall sponge can grow up to 2 meters in length.
• Its spicules include c-shaped spinispires with spines only on the convex surface.
• It is found from the Cape Peninsula to Cape Agulhas around the South African coast.
• The sponge has a yellow interior beneath its orange skin.