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DescriptionThis sponge may grow as a thin sheet or cushion, developing into ascending finger-like growths. The surface is irregular, with raised areas that are denser in appearance supported by the underlying skeleton, with a transparent surface membrane between these ridges. The colour is off-white, grey, through bright yellow to bright orange, blackening on contact with air and on preservation. Large specimens may superficially resemble Myxilla incrustans or Myxilla rosacea, however the blackening on death is very noticeable.