“Reticulidia fungia grows to a maximum length of 40 and does not grow as large as Reticulidia halgerda. Reticulidia fungia has broad-based ridges, those being fewer in number than those of Reticulidia halgerda. The base of these ridges has a fine, white border. The mantle margin is broad and blue-grey in colour. It has a single, black line around the side of its foot, occurring slightly above its gills.”