"A Phyllodesmium with longitudinal ridges on the upper section of its cerata, which I think it is a dark coloured form of Phyllodesmium jackobsenae
Previous comment from Dr. Richard Willan: This aeolid, which mimics the soft corals on which it feeds, is characterised the by the cerata having swollen tips with longitudinal ridges. This individual is atypical in being reddish brown; most individuals are coloured creamish green."